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Common and Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended
Dec. 01, 2015
Apr. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Equity [Abstract]          
Increase in share repurchase authorized amount $ 300,000        
Purchase of common stock (in shares)     106,000 726,000  
Repurchase of common stock, including subsequent settlements     $ 9,800 $ 53,900  
Purchase of common stock   $ 200 9,799 $ 55,971  
Remaining authorized repurchase amount     $ 570,200    
Common stock, authorized (in shares)     150,000,000   150,000,000
Common stock, par value (in dollars per share)     $ 0.01   $ 0.01
Preferred stock, authorized (in shares)     5,000,000   5,000,000
Preferred stock, par value (in dollars per share)     $ 0.01   $ 0.01
Preferred stock, shares outstanding (in shares)     0   0