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Equity (Details 4) (USD $)
1 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2013
Stock Repurchase Program      
Repurchase of common stock, authorized amount $ 50,000,000    
Available repurchase of common stock, authorized amount   16,000,000  
Stock repurchased during period     $ 0