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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 20,477	$ 82,957	$ 38,254
Defined benefit pension plans
Actuarial gain, net of tax of $3,598, $1,792, and $3,703, respectively	10,580	5,275	5,919
Amortization of actuarial loss, net of tax of $380, $651, and $957, respectively	1,117	1,035	1,527
Effects of settlements, net of tax of $5,902, $0, and $1,598, respectively	17,353	0	2,557
Other comprehensive income, net of tax	29,050	6,310	10,003
Comprehensive income	$ 49,527	$ 89,267	$ 48,257

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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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