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10-Q 09-30-2019 XBRL INSTANCE DOCUMENT arl-20190930.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20190930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20190930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20190930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20190930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20190930_pre.xml
     
10-Q 06-30-2019 XBRL INSTANCE DOCUMENT arl-20190630.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20190630.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20190630_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20190630_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20190630_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20190630_pre.xml
     
10-Q 03-31-2019 XBRL INSTANCE DOCUMENT arl-20191231.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20190930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20190930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20190930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20190930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20190930_pre.xml
     
10-K 12-31-2018 XBRL INSTANCE DOCUMENT arl-20181231.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20180930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20180930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20180930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20180930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20180930_pre.xml
     
10-Q 09-30-2018 XBRL INSTANCE DOCUMENT arl-20180930.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20180930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20180930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20180930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20180930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20180930_pre.xml
     
10-Q 06-30-2018 XBRL INSTANCE DOCUMENT arl-20180630.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20180630.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20180630_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20180630_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20180630_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20180630_pre.xml
     
10-Q 03-31-2018 XBRL INSTANCE DOCUMENT arl-20181231.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20180930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20180930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20180930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20180930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20180930_pre.xml
     
10-K 12-31-2017 XBRL INSTANCE DOCUMENT arl-20171231.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20170930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20170930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20170930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20170930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20170930_pre.xml
     
10-Q 09-30-2017 XBRL INSTANCE DOCUMENT arl-20170930.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20170930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20170930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20170930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20170930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20170930_pre.xml
     
10-Q 06-30-2017 XBRL INSTANCE DOCUMENT arl-20170630.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20170630.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20170630_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20170630_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20170630_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20170630_pre.xml
     
10-Q 03-31-2017 XBRL INSTANCE DOCUMENT arl-20170331.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20170331.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20170331_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20170331_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20170331_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20170331_pre.xml
     
10-k 12-31-2016 XBRL INSTANCE DOCUMENT arl-20161231.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20161231.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20161231_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20161231_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20161231_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20161231_pre.xml
     
10-Q 09-30-2016 XBRL INSTANCE DOCUMENT arl-20160930.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20160930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20160930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20160930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20160930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20160930_pre.xml
     
10-Q 06-30-2016 XBRL INSTANCE DOCUMENT arl-20160630.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20160630.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20160630_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20160630_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20160630_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20160630_pre.xml
     
10-Q 03-31-2016 XBRL INSTANCE DOCUMENT arl-20160331.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20160331.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20160331_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20160331_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20160331_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20160331_pre.xml
     
10-k 12-31-2015 XBRL INSTANCE DOCUMENT arl-20151231.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20151231.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20151231_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20151231_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20151231_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20151231_pre.xml
     
10-Q 09-30-2015 XBRL INSTANCE DOCUMENT arl-20150930.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20150930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20150930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20150930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20150930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20150930_pre.xml
     
10-Q 06-30-2015 XBRL INSTANCE DOCUMENT arl-20150630.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20150630.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20150630_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20150630_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20150630_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20150630_pre.xml
     
10-Q 03-31-2015 XBRL INSTANCE DOCUMENT arl-20150331.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20150331.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20150331_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20150331_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20150331_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20150331_pre.xml
     
10-k 12-31-2014 XBRL INSTANCE DOCUMENT arl-20141231.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20141231.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20141231_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20141231_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20141231_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20141231_pre.xml
     
10-Q 09-30-2014 XBRL INSTANCE DOCUMENT arl-20140930.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20140930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20140930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20140930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20140930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20140930_pre.xml
     
10-Q 06-30-2014 XBRL INSTANCE DOCUMENT arl-20140630.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20140630.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20140630_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20140630_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20140630_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20140630_pre.xml
     
10-Q 03-31-2014 XBRL INSTANCE DOCUMENT arl-20140331.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20140331.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20140331_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20140331_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20140331_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20140331_pre.xml
     
10-K 12-31-2013 XBRL INSTANCE DOCUMENT arl-20131231.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20131231.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20131231_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20131231_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20131231_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20131231_pre.xml
     
10-Q 09-30-2013 XBRL INSTANCE DOCUMENT arl-20130930.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20130930.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20130930_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20130930_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20130930_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20130930_pre.xml
     
10-Q 06-30-2013 XBRL INSTANCE DOCUMENT arl-20130630.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20130630.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20130630_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20130630_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20130630_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20130630_pre.xml
     
10-Q 03-31-2013 XBRL INSTANCE DOCUMENT arl-20130331.xml
  XBRL TAXONOMY EXTENSION SCHEMA arl-20130331.xsd
  XBRL TAXONOMY EXTENSION CALCULATION LINKBASE arl-20130331_cal.xml
  XBRL TAXONOMY EXTENSION DEFINITION LINKBASE arl-20130331_def.xml
  XBRL TAXONOMY EXTENSION LABEL LINKBASE arl-20130331_lab.xml
  XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE arl-20130331_pre.xml