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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
	Mar. 31, 2021	Mar. 31, 2020
Numerator for basic and diluted earnings per share:
Net income	$ 36,976	$ 47,550
Denominator:
Weighted-average basic common shares outstanding (in shares)	40,611	39,500
Assumed conversion of dilutive securities:
Stock awards (in shares)	1,445	1,644
Convertible senior notes (in shares)	0	0
Denominator for diluted earnings per share - Adjusted weighted-average shares (in shares)	42,056	41,144
Earnings per common share:
Basic (usd per share)	$ 0.91	$ 1.20
Diluted (usd per share)	$ 0.88	$ 1.16

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