Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Aug. 20, 2018
Earnings Per Common Share [Line Items]
Conversion price (in dollars per share)	$ 101.38	$ 101.38	$ 101.38	$ 101.38
Numerator — basic and diluted
Net income	$ 62,395	$ 51,428	$ 109,942	$ 110,749
Net income	$ 62,395	$ 51,428	$ 109,942	$ 110,749
Denominator
Weighted average number of common shares outstanding — basic (in shares)	33,359	33,790	33,331	33,705
Effect of dilutive share-based awards (in shares)	550	586	562	639
Effect of dilutive stock options (in shares)	297	331	301	334
Effect of dilutive convertible notes (in shares)	1,444	1,202	1,372	1,100
Weighted average number of common shares outstanding — diluted (in shares)	35,650	35,909	35,566	35,778
Earnings per common share — basic (in dollars per share)	$ 1.87	$ 1.52	$ 3.30	$ 3.29
Earnings per common share — diluted (in dollars per share)	$ 1.75	$ 1.43	$ 3.09	$ 3.10
Stock Options And Share-Based Awards
Denominator
Antidilutive stock options and share-based awards (in shares)	3	23	6	15
2023 Convertible Notes | Senior Notes
Earnings Per Common Share [Line Items]
Interest rate (as a percent)	2.00%		2.00%		2.00%
Conversion price (in dollars per share)					$ 101.38