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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Basic and Diluted Earnings per share    
Weighted average basic common shares outstanding 22,448 23,443
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock 5 3
Weighted average dilutive common shares outstanding 22,453 23,446
Basic:    
Net income $ 34,291 $ 35,815
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic $ 1,348 $ 1,388
Basic earnings per common share $ 1.47 $ 1.47
Earnings available to basic common shares $ 32,943 $ 34,427
Diluted:    
Net income 34,291 35,815
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 1,348 1,388
Earnings available to diluted common shares $ 32,943 $ 34,427
Diluted earnings per common share $ 1.47 $ 1.47