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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 33,586	$ 27,718	$ 45,786	$ 39,107
Defined benefit pension plans
Amortization of actuarial (gain) loss, net of tax	150	(33)	301	(65)
Amortization of actuarial (gain) loss, tax	51	(11)	102	(22)
Effects of Settlements, net of tax	0	0	64	0
Effect of settlements, tax effect	0	0	22	0
Other comprehensive income (loss), net of tax	150	(33)	365	(65)
Comprehensive income	$ 33,736	$ 27,685	$ 46,151	$ 39,042

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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