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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Weighted average common shares outstanding (in shares)                 19,453 20,420 21,161
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock (in shares)                 8 5 9
Weighted average dilutive common shares outstanding (in shares)                 19,461 20,425 21,170
Basic:                      
Net income (loss) $ 30,718 $ 34,777 $ 56,463 $ 35,814 $ 110,489 $ 29,881 $ 39,133 $ 33,939 $ 157,772 $ 213,442 $ 147,065
Less: Earnings (loss) allocated to participating securities                 5,416 7,512 5,871
Earnings (loss) available to basic common shares                 $ 152,356 $ 205,930 $ 141,194
Basic earnings (loss) per common share (in dollars per share) $ 1.62 $ 1.74 $ 2.72 $ 1.70 $ 5.27 $ 1.43 $ 1.84 $ 1.58 $ 7.83 $ 10.08 $ 6.67
Diluted:                      
Net income (loss) $ 30,718 $ 34,777 $ 56,463 $ 35,814 $ 110,489 $ 29,881 $ 39,133 $ 33,939 $ 157,772 $ 213,442 $ 147,065
Less: Earnings (loss) allocated to participating securities                 5,414 7,511 5,869
Earnings (loss) available to diluted common shares                 $ 152,358 $ 205,931 $ 141,196
Diluted earnings (loss) per common share (in dollars per share) $ 1.62 $ 1.74 $ 2.72 $ 1.70 $ 5.27 $ 1.43 $ 1.84 $ 1.58 $ 7.83 $ 10.08 $ 6.67