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Supplemental Cash Flow Information	12 Months Ended
Supplemental Cash Flow Information	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information ARI received interest income of $2.5 million, $2.7 million and $3.3 million for the years ended December 31, 2014, 2013 and 2012, respectively. ARI paid interest expense, net of capitalized interest, of $6.9 million, $11.1 million and $20.5 million for the years ended December 31, 2014, 2013 and 2012, respectively. ARI paid $24.2 million and $17.0 million of taxes, net of refunds, for the years ended December 31, 2014 and 2013, respectively, and received net tax refunds of $0.8 million for the year ended December 31, 2012. ARI paid $5.3 million, $8.2 million and $5.8 million to employees related to SARs exercises during the years ended December 31, 2014, 2013 and 2012, respectively. ARI had $3.3 million, $1.8 million and $1.1 million of capital expenditures in accounts payable and accrued expenses and taxes on the consolidated balance sheets at December 31, 2014, 2013 and 2012, respectively.