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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basic and Diluted Earnings per share        
Weighted average basic common shares outstanding 20,568 23,132 21,355 23,294
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock 10 5 9 4
Weighted average dilutive common shares outstanding 20,578 23,137 21,364 23,298
Basic:        
Net income $ 35,366 $ 45,261 $ 116,237 $ 127,385
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 1,427 1,729 4,652 4,906
Earnings available to basic common shares $ 33,939 $ 43,532 $ 111,585 $ 122,479
Basic earnings per common share $ 1.65 $ 1.88 $ 5.23 $ 5.26
Diluted:        
Net income $ 35,366 $ 45,261 $ 116,237 $ 127,385
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 1,426 1,729 4,651 4,905
Earnings available to diluted common shares $ 33,940 $ 43,532 $ 111,586 $ 122,480
Diluted earnings per common share $ 1.65 $ 1.88 $ 5.22 $ 5.26