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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 82,957	$ 38,254	$ 52,182
Defined benefit pension plans
Actuarial gain, net of tax of $1,792, $3,703, 3,235 and respectively	5,275	5,919	5,171
Amortization of actuarial loss, net of tax of $651, $957, and $1,880, respectively	1,035	1,527	3,004
Effects of settlements, net of tax of $0, $1,598, and $193, respectively	0	2,557	308
Other comprehensive income, net of tax	6,310	10,003	8,483
Comprehensive income	$ 89,267	$ 48,257	$ 60,665

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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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Amount, after tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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