Supplemental Cash Flow Information	6 Months Ended
Supplemental Cash Flow Information	Jun. 30, 2013
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information ARI received interest income of $1.4 million and $1.8 million for the six months ended June 30, 2013 and 2012, respectively. ARI paid interest expense, net of capitalized interest, of $8.4 million and $10.0 million for the six months ended June 30, 2013 and 2012, respectively. ARI paid $6.1 million and $1.6 million of taxes, net of refunds for the six months ended June 30, 2013 and 2012, respectively. ARI paid $6.5 million and $2.1 million to employees related to SARs exercises during the six months ended June 30, 2013 and 2012, respectively.

The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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