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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 174,979	$ 80,925	$ 20,477
Defined benefit pension plans
Actuarial gain (loss), net of tax	5,104	(3,466)	10,580
Amortization of actuarial (gain) loss, net of tax	603	(131)	1,117
Effects of Settlements, net of tax	4,669	1,001	17,353
Stranded tax effects of pension plan termination	38,794	0	0
Other comprehensive income (loss), net of tax	49,170	(2,596)	29,050
Comprehensive income	$ 224,149	$ 78,329	$ 49,527

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