Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Common stock	Retained Earnings [Member]
Shareholders' equity, beginning balance at Dec. 31, 2020		$ 98,970	$ 1,933,627
Proceeds from stock options exercised		215
Share-based compensation expense		106
Withholding tax on stock options exercised		(383)
Net (loss) income	$ 217,464		217,464
Dividends paid to shareholders			(105,066)
Shareholders' equity, ending balance at Sep. 30, 2021	2,144,933	98,908	2,046,025
Shareholders' equity, beginning balance at Jun. 30, 2021		98,872	2,079,759
Proceeds from stock options exercised		0
Share-based compensation expense		36
Withholding tax on stock options exercised		0
Net (loss) income	1,288		1,288
Dividends paid to shareholders			(35,022)
Shareholders' equity, ending balance at Sep. 30, 2021	2,144,933	98,908	2,046,025
Shareholders' equity, beginning balance at Dec. 31, 2021	2,140,281	98,943	2,041,338
Proceeds from stock options exercised		0
Share-based compensation expense		15
Withholding tax on stock options exercised		(11)
Net (loss) income	(505,902)		(505,902)
Dividends paid to shareholders			(87,902)
Shareholders' equity, ending balance at Sep. 30, 2022	1,546,481	98,947	1,447,534
Shareholders' equity, beginning balance at Jun. 30, 2022		98,947	1,563,418
Proceeds from stock options exercised		0
Share-based compensation expense		0
Withholding tax on stock options exercised		0
Net (loss) income	(98,303)		(98,303)
Dividends paid to shareholders			(17,581)
Shareholders' equity, ending balance at Sep. 30, 2022	$ 1,546,481	$ 98,947	$ 1,447,534