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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Basic and Diluted Earnings per share        
Weighted average basic common shares outstanding 20,222 20,568 20,475 21,355
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock 3 10 5 9
Weighted average dilutive common shares outstanding 20,225 20,578 20,480 21,364
Basic:        
Net income $ 29,881 $ 35,366 $ 102,953 $ 116,237
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 1,024 1,427 3,660 4,652
Earnings available to basic common shares $ 28,857 $ 33,939 $ 99,293 $ 111,585
Basic earnings per common share $ 1.43 $ 1.65 $ 4.85 $ 5.23
Diluted:        
Net income $ 29,881 $ 35,366 $ 102,953 $ 116,237
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 1,023 1,426 3,659 4,651
Earnings available to diluted common shares $ 28,858 $ 33,940 $ 99,294 $ 111,586
Diluted earnings per common share $ 1.43 $ 1.65 $ 4.85 $ 5.22