Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning of year at Dec. 31, 2019		$ 98,828	$ 1,700,674	$ (2,014)	$ 1,698,660
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds of stock options exercised		0
Share-based compensation expense		142
Withholding tax on stock options exercised		0
Net (loss) income	$ 374,607		374,607
Dividends paid to shareholders			(139,640)
End of year at Dec. 31, 2020	2,032,597	98,970	1,933,627	0	1,933,627
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds of stock options exercised		215
Share-based compensation expense		141
Withholding tax on stock options exercised		(383)
Net (loss) income	247,937		247,937
Dividends paid to shareholders			(140,226)
End of year at Dec. 31, 2021	2,140,281	98,943	2,041,338	$ 0	$ 2,041,338
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds of stock options exercised		0
Share-based compensation expense		15
Withholding tax on stock options exercised		(11)
Net (loss) income	(512,672)		(512,672)
Dividends paid to shareholders			(105,482)
End of year at Dec. 31, 2022	$ 1,522,131	$ 98,947	$ 1,423,184