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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 302,556	$ 33,586	$ 451,712	$ 45,786
Defined benefit pension plans
Amortization of actuarial (gain) loss, net of tax	(3)	150	(7)	301
Effects of Settlements, net of tax	0	0	0	64
Other comprehensive income (loss), net of tax	(3)	150	(7)	365
Comprehensive income	$ 302,553	$ 33,736	$ 451,705	$ 46,151

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