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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 149,156	$ 12,200
Defined benefit pension plans
Amortization of actuarial (gain) loss, net of tax	(4)	151
Effects of Settlements, net of tax	0	64
Other comprehensive income (loss), net of tax	(4)	215
Comprehensive income	$ 149,152	$ 12,415

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