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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 80,925	$ 20,477	$ 82,957
Defined benefit pension plans
Actuarial gain (loss), net of tax of ($1,176), $3,598, and $1,792, respectively	(3,466)	10,580	5,275
Amortization of actuarial (gain) loss, net of tax of ($44), $380, and $651, respectively	(131)	1,117	1,035
Effects of settlements, net of tax of $341, $5,902, and $-, respectively	1,001	17,353	0
Other comprehensive income (loss), net of tax	(2,596)	29,050	6,310
Comprehensive income	$ 78,329	$ 49,527	$ 89,267

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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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Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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