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		70
Withholding tax on stock options exercised		(383)
Net (loss) income	$ 216,176		216,176
Dividends paid to shareholders			(70,044)
Shareholders' equity, ending balance at Jun. 30, 2021	2,178,631	98,872	2,079,759
Shareholders' equity, beginning balance at Mar. 31, 2021		98,837	2,005,600
Proceeds from stock options exercised		0
Share-based compensation expense		35
Withholding tax on stock options exercised		0
Net (loss) income	109,181		109,181
Dividends paid to shareholders			(35,022)
Shareholders' equity, ending balance at Jun. 30, 2021	2,178,631	98,872	2,079,759
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	(407,599)		(407,599)
Dividends paid to shareholders			(70,321)
Shareholders' equity, ending balance at Jun. 30, 2022	1,662,365	98,947	1,563,418
Shareholders' equity, beginning balance at Mar. 31, 2022		98,947	1,809,260
Proceeds from stock options exercised		0
Share-based compensation expense		0
Withholding tax on stock options exercised		0
Net (loss) income	(210,681)		(210,681)
Dividends paid to shareholders			(35,161)
Shareholders' equity, ending balance at Jun. 30, 2022	$ 1,662,365	$ 98,947	$ 1,563,418