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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Basic and Diluted Earnings per share    
Weighted average basic common shares outstanding 20,692 22,448
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock 6 5
Weighted average dilutive common shares outstanding 20,698 22,453
Basic:    
Net income $ 33,939 $ 34,291
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 1,250 1,348
Earnings available to basic common shares $ 32,689 $ 32,943
Basic earnings per common share $ 1.58 $ 1.47
Diluted:    
Net income $ 33,939 $ 34,291
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 1,250 1,348
Earnings available to diluted common shares $ 32,689 $ 32,943
Diluted earnings per common share $ 1.58 $ 1.47