Consolidated Statements of Cash Flows (Parenthetical)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Statement of Cash Flows [Abstract] | |||
Number of restricted common stock issued for acquisition of ARI | 0 | 0 | 893,105 |
Number of common stock issued for retirement plan obligations | 165,241 | 90,085 | 81,696 |
Number of restricted common stock issued for annual equity award | 487,181 | 592,697 | 699,673 |