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Accumulated Other Comprehensive Income, Reclassified (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Amortization of postretirement benefit plans [Abstract]
Unrecognized (gain) loss		$ (10)	$ (165)	$ (31)	$ (496)
Income tax expense		4	$ 66	8	$ 10
Total reclassifications for the period		(6)		(18)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of postretirement benefit plans [Abstract]
Prior service benefit	[1]	0		0
Unrecognized (gain) loss	[1]	(10)		(31)
Total before income tax		(10)		(31)
Income tax expense		4		13
Total reclassifications for the period		$ (6)		$ (18)
[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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