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, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income	$ 92,024	$ 84,710	$ 52,820	$ 103,080	$ 106,168	$ 67,391	$ 229,554	$ 276,639
Income allocated to participating securities	(479)			(614)			(1,235)	(1,526)
Net income available to common shareholders	$ 91,545			$ 102,466			$ 228,319	$ 275,113
Denominator:
Weighted average shares of common stock outstanding – basic (in shares)	50,041			54,847			50,641	55,233
Basic earnings per share (in usd per share)	$ 1.83			$ 1.87			$ 4.51	$ 4.98
Numerator:
Net income	$ 92,024	$ 84,710	$ 52,820	$ 103,080	$ 106,168	$ 67,391	$ 229,554	$ 276,639
Income allocated to participating securities	(479)			(614)			(1,235)	(1,526)
Net income available to common shareholders	$ 91,545			$ 102,466			$ 228,319	$ 275,113
Denominator:
Weighted average shares of common stock outstanding – basic (in shares)	50,041			54,847			50,641	55,233
Diluted effect of stock options, PVRSUs and RSUs (in shares)	430			395			413	520
Weighted average shares of common stock outstanding – diluted (in shares)	50,471			55,242			51,054	55,753
Diluted earnings per share (in usd per share)	$ 1.81			$ 1.85			$ 4.47	$ 4.93