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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 27,171	$ 13,848	$ 66,278	$ 92,723
Defined benefit pension plans
Actuarial gain (loss), net of tax of $-, ($983), $- and $2,400, respectively	0	(2,891)	0	7,066
Amortization of actuarial (gain) loss, net of tax of ($12), $39, ($34) and $337, respectively	(32)	112	(97)	991
Effect of settlements, net of tax of $341, $2,853, $341, and $5,897, respectively	1,001	8,399	1,001	17,358
Other comprehensive income, net of tax	969	5,620	904	25,415
Comprehensive income	$ 28,140	$ 19,468	$ 67,182	$ 118,138

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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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