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Equity (Stock Repurchase Program) (Details) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 21, 2015
Stock Repurchase Program    
Treasury stock, shares, acquired 1,667,209  
Treasury stock value acquired including acquisition costs $ 20,300,000  
Treasury stock acquired, average cost per share (usd per share) $ 12.16  
Repurchase of common stock, authorized amount   $ 50,000,000
Available repurchase of common stock, authorized amount $ 48,700,000