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Consolidated Statements of Equity (Parenthetical)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements of Equity      
Issuance of common stock 7,500,000   3,593,750
Issuance of shares of nonvested stock 464,175 357,500 514,650
Issuance of shares of nonvested stock, forfeitures 1,500 1,100