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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Basic and Diluted Earnings per share        
Weighted average basic common shares outstanding 20,516 21,057 20,604 21,753
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock 6 13 5 9
Weighted average dilutive common shares outstanding 20,522 21,070 20,609 21,762
Basic:        
Net income $ 39,133 $ 46,580 $ 73,072 $ 80,871
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 1,389 1,885 2,645 3,224
Earnings available to basic common shares $ 37,744 $ 44,695 $ 70,427 $ 77,647
Basic earnings per common share $ 1.84 $ 2.12 $ 3.42 $ 3.57
Diluted:        
Net income $ 39,133 $ 46,580 $ 73,072 $ 80,871
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 1,389 1,884 2,645 3,223
Earnings available to diluted common shares $ 37,744 $ 44,696 $ 70,427 $ 77,648
Diluted earnings per common share $ 1.84 $ 2.12 $ 3.42 $ 3.57