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Condensed Consolidated Statements of Equity (Parenthetical)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Condensed Consolidated Statements of Equity    
Issuance of common stock   7,500,000
Issuance of shares of nonvested stock 200,634 15,000
Forfeiture of shares of nonvested stock 9,750