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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 13,848	$ 31,661	$ 92,723	$ 63,835
Defined benefit pension plans
Actuarial gain (loss), net of tax of ($983), $-, $2,400 and $-, respectively	(2,891)	0	7,066	0
Amortization of actuarial loss, net of tax of $39, $170, $337 and $479, respectively	112	271	991	766
Effect of settlements, net of tax of $2,853, $-, $5,897 and $-, respectively	8,399	0	17,358	0
Other comprehensive income, net of tax	5,620	271	25,415	766
Comprehensive income	$ 19,468	$ 31,932	$ 118,138	$ 64,601

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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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