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Retirement and Share-based Compensation Plans (Changes in the Number of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Outstanding, number of shares 2,918,946 3,443,991 4,044,175 3,976,725
Outstanding, weighted-average exercise price per share $ 16.06 $ 15.17 $ 15.02 $ 10.86
Outstanding, total exercise price $ 46,885 $ 52,240 $ 60,760 $ 43,171
Granted, number of shares 0 0 1,277,650  
Granted, weighted-average exercise price per share $ 0.00 $ 0.00 $ 24.79  
Granted, total exercise price $ 0 $ 0 $ 31,673  
Canceled, number of shares (24,700) (47,300) (35,400)  
Canceled, weighted-average exercise price per share $ 14.83 $ 10.54 $ 11.64  
Canceled, total exercise price $ (366) $ (499) $ (412)  
Exercised, number of shares (500,345) (552,884) (1,174,800)  
Exercised, weighted-average exercise price per share $ 9.97 $ 14.51 $ 11.64  
Exercised, total exercise price $ (4,989) $ (8,021) $ (13,672)