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Equity (Stock Repurchase Program) (Details) - USD ($)
$ / shares in Units, shares in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2017
Aug. 04, 2016
Feb. 15, 2016
Stock Repurchase Program        
Repurchase of common stock, authorized amount     $ 50,000,000.0 $ 50,000,000.0
Treasury stock, shares, acquired 5.8      
Treasury stock value acquired including acquisition costs $ 58,100,000      
Treasury stock acquired, average cost per share (in dollars per share) $ 9.94      
Available repurchase of common stock, authorized amount (up to)   $ 50,000,000