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Consolidated Statements of Cash Flows (Parenthetical)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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