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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 103,192	$ 27,171	$ 148,978	$ 66,278
Defined benefit pension plans
Amortization of actuarial (gain) loss, net of tax	151	(32)	452	(97)
Amortization of actuarial (gain) loss, tax	51	(12)	153	(34)
Effects of Settlements, net of tax	0	1,001	64	1,001
Effect of settlements, tax effect	0	341	22	341
Other comprehensive income, net of tax	151	969	516	904
Comprehensive income	$ 103,343	$ 28,140	$ 149,494	$ 67,182

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