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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 91,699	$ 103,192	$ 543,411	$ 148,978
Defined benefit pension plans
Amortization of actuarial (gain) loss, net of tax	(3)	151	(10)	452
Effects of Settlements, net of tax	0	0	0	64
Other comprehensive income (loss), net of tax	(3)	151	(10)	516
Comprehensive income	$ 91,696	$ 103,343	$ 543,401	$ 149,494

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