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Equity (Stock Repurchase Program) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Oct. 31, 2017
Debt Instrument [Line Items]            
Treasury stock, shares, acquired (in shares)   800,000 0      
Treasury stock value acquired including acquisition costs   $ 8,300        
Treasury stock acquired, average cost per share (in dollars per share)   $ 10.22        
Repurchase of stock       $ 8,304 $ 45,928  
Available repurchase of common stock, authorized amount (up to)     $ 41,700 $ 41,700    
Unsecured 3.125% Senior Convertible Notes Due September 2022            
Debt Instrument [Line Items]            
Treasury stock acquired, average cost per share (in dollars per share) $ 11.51          
Stated interest rates (as a percent) 3.125%   3.125% 3.125% 3.125% 3.125%
Shares repurchased (in shares) 4,000,000          
Repurchase of stock $ 45,900