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		35
Withholding tax on stock options exercised		(383)
Net (loss) income	$ 106,995		106,995
Dividends paid to shareholders			(35,022)
Shareholders' equity, ending balance at Mar. 31, 2021	2,104,437	98,837	2,005,600
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	(196,917)		(196,917)
Dividends paid to shareholders			(35,161)
Shareholders' equity, ending balance at Mar. 31, 2022	$ 1,908,207	$ 98,947	$ 1,809,260