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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Basic and Diluted Earnings per share    
Weighted average basic common shares outstanding (in shares) 17,797 20,298
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock (in shares) 52 9
Weighted average dilutive common shares outstanding (in shares) 17,849 20,307
Basic:    
Net income (loss) $ 38,648 $ 35,814
Less: Earnings (loss) allocated to participating securities 1,458 1,209
Net income (loss) available to basic common shares $ 37,190 $ 34,605
Basic earnings (loss) per common share (in dollars per share) $ 2.09 $ 1.70
Diluted:    
Net income (loss) $ 38,648 $ 35,814
Less: Earnings (loss) allocated to participating securities 1,455 1,208
Net income (loss) available to basic common shares $ 37,193 $ 34,606
Diluted earnings (loss) per common share (in dollars per share) $ 2.08 $ 1.70