Earnings Per Share - Computation Of Basic And Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income	$ 103,080	$ 106,168	$ 67,391	$ 116,655	$ 85,882	$ 22,337	$ 276,639	$ 224,874
Income allocated to participating securities	(614)			(420)			(1,526)	(910)
Net income available to common shareholders	$ 102,466			$ 116,235			$ 275,113	$ 223,964
Denominator:
Weighted average shares of common stock outstanding – basic (in shares)	54,847			55,427			55,233	55,360
Basic earnings per share (in usd per share)	$ 1.87			$ 2.10			$ 4.98	$ 4.05
Numerator:
Net income	$ 103,080	$ 106,168	$ 67,391	$ 116,655	$ 85,882	$ 22,337	$ 276,639	$ 224,874
Income allocated to participating securities	(614)			(420)			(1,526)	(910)
Net income available to common shareholders	$ 102,466			$ 116,235			$ 275,113	$ 223,964
Denominator:
Weighted average shares of common stock outstanding – basic (in shares)	54,847			55,427			55,233	55,360
Diluted effect of stock options and PVRSUs (in shares)	395			478			520	429
Weighted average shares of common stock outstanding – diluted (in shares)	55,242			55,905			55,753	55,789
Diluted earnings per share (in usd per share)	$ 1.85			$ 2.08			$ 4.93	$ 4.01