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, 2022	Mar. 31, 2021
Numerator for basic and diluted earnings per share:
Net income	$ 39,984	$ 36,976
Net income	$ 39,984	$ 36,976
Denominator:
Weighted-average basic common shares outstanding (in shares)	41,364	40,611
Assumed conversion of dilutive securities:
Stock awards (in shares)	1,079	1,445
Convertible Senior Notes (in shares)	0	0
Denominator for diluted earnings per share- Adjusted weighted-average shares (in shares)	42,443	42,056
Earnings per common share:
Basic (in usd per share)	$ 0.97	$ 0.91
Diluted (in usd per share)	$ 0.94	$ 0.88