Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
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	$ 77,267	$ 69,480	$ 188,016	$ 196,758
Net income	$ 77,267	$ 69,480	$ 188,016	$ 196,758
Denominator
Weighted average number of common shares outstanding — basic (in shares)	33,812	33,495	33,741	33,478
Effect of dilutive share-based awards (in shares)	545	662	607	697
Effect of dilutive stock options (in shares)	322	363	330	369
Effect of dilutive convertible notes (in shares)	1,239	842	1,147	721
Weighted average number of common shares outstanding — diluted (in shares)	35,918	35,362	35,825	35,265
Earnings per common share — basic (in dollars per share)	$ 2.29	$ 2.07	$ 5.57	$ 5.88
Earnings per common share — diluted (in dollars per share)	$ 2.15	$ 1.96	$ 5.25	$ 5.58
Stock Options And Share-Based Awards
Denominator
Antidilutive stock options and share-based awards (in shares)	0	2	10	5