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Condensed Consolidated Statements of Equity (Parenthetical)
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Increase (Decrease) in Shareholders' Equity    
Issuance of common stock (in shares)   7,500,000
Issuance of shares of nonvested stock (in shares) 200,634 15,000
Forfeiture of shares of nonvested stock (in shares) 21,500 1,500