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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Basic and Diluted Earnings per share        
Weighted average basic common shares outstanding (in shares) 17,908 20,036 17,853 20,167
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock (in shares) 22 10 25 9
Weighted average dilutive common shares (in shares) 17,930 20,046 17,878 20,176
Basic        
Net income (loss) $ 49,225 $ 56,463 $ 87,873 $ 92,277
Less: Earnings (loss) allocated to participating securities 1,844 1,916 3,303 3,123
Net income (loss) available to basic common shares $ 47,381 $ 54,547 $ 84,570 $ 89,154
Basic earnings (loss) per common share (in dollars per share) $ 2.65 $ 2.72 $ 4.74 $ 4.42
Diluted        
Net income (loss) $ 49,225 $ 56,463 $ 87,873 $ 92,277
Less: Earnings (loss) allocated to participating securities 1,842 1,916 3,299 3,123
Net income (loss) available to diluted common shares $ 47,383 $ 54,547 $ 84,574 $ 89,154
Diluted earnings (loss) per common share (in dollars per share) $ 2.64 $ 2.72 $ 4.73 $ 4.42