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Accumulated Other Comprehensive Income, Reclassified (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amortization of postretirement benefit plans [Abstract]
Unrecognized gain		$ (12)	$ (271)	$ (21)	$ (330)
Income tax expense		0	$ (81)	4	$ (57)
Total reclassifications for the period		(7)		(12)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of postretirement benefit plans [Abstract]
Prior service benefit	[1]	0		0
Unrecognized gain	[1]	(12)		(21)
Total before income tax		(12)		(21)
Income tax expense		5		9
Total reclassifications for the period		$ (7)		$ (12)
[1] These accumulated other comprehensive income components are included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income, net in our consolidated statements of operations (see Note 12 for additional details).

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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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