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Statements of Consolidated Comprehensive Income (Loss) - 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
Comprehensive Income Net Of Tax [Abstract]
Net income	$ 702	$ 6,278	$ 4,156	$ 1,518	$ 5,100	$ 4,742	$ 2,755	$ 2,658	$ 12,654	$ 15,255	$ 6,675
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment									10,070	(3,579)	(19,789)
Recognized net actuarial loss									269	326	364
Gain (loss) on unfunded pension obligations									(410)	35	408
Other comprehensive income (loss), net of tax									9,929	(3,218)	(19,017)
Comprehensive income (loss)									$ 22,583	$ 12,037	$ (12,342)

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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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 and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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