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Other Comprehensive Income (Loss), Summary of Unrealized Gains and Losses on Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 179,882	$ 177,537	$ 174,910	$ 172,521	$ 175,994	$ 174,788	$ 171,544	$ 167,498	$ 172,521	$ 167,498	$ 161,554
Other comprehensive loss	(1,349)	(263)	174	60	(2,489)	(1,090)	880	1,841	(1,378)	(858)	(1,494)
Balance	181,321	$ 179,882	$ 177,537	174,910	172,521	$ 175,994	$ 174,788	171,544	181,321	172,521	167,498
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance				$ (102)				$ (156)	(102)	(156)	(125)
Unrealized gains (losses) during the period									(30)	84	(48)
Related deferred taxes									11	(30)	17
Reclassification adjustment for effect of enacted tax law changes									(26)	0	0
Other comprehensive loss									(45)	54	(31)
Balance	$ (147)				$ (102)				$ (147)	$ (102)	$ (156)

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Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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