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Earnings Per Share - Computation of Basic Earnings and Diluted Earnings Per Share Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator for basic and diluted earnings per share:        
Net income $ 25,530 $ 53,892 $ 62,506 $ 101,442
Denominator:        
Weighted-average basic common shares outstanding (in shares) 40,765 39,963 40,761 39,984
Assumed conversion of dilutive securities:        
Stock awards (in shares) 1,329 1,453 1,387 1,548
Convertible senior notes (in shares) 0 0 0 0
Denominator for diluted earnings per share - Adjusted weighted-average shares (in shares) 42,094 41,416 42,148 41,532
Earnings per common share:        
Basic (usd per share) $ 0.63 $ 1.35 $ 1.53 $ 2.54
Diluted (usd per share) $ 0.61 $ 1.30 $ 1.48 $ 2.44