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Equity (Stock Repurchase Program) (Details) - USD ($)
$ / shares in Units, shares in Millions
 1 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Aug. 04, 2016
Feb. 29, 2016
Stock Repurchase Program          
Repurchase of common stock, authorized amount       $ 50,000,000.0 $ 50,000,000.0
Common stock repurchased (in shares) 4.0        
Repurchase of stock $ 45,900,000 $ 45,928,000 $ 98,429,000    
Average cost per share (in dollars per share) $ 11.51        
Treasury stock, shares, acquired     10.2    
Treasury stock value acquired including acquisition costs     $ 98,400,000    
Treasury stock acquired, average cost per share (in dollars per share)     $ 9.67    
Available repurchase of common stock, authorized amount (up to) $ 4,100,000 $ 4,100,000      
3.125% senior convertible notes          
Stock Repurchase Program          
Stated interest rates (as a percent) 3.125% 3.125%