Statements of Consolidated Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 12,861us-gaap_ProfitLoss	$ 20,587us-gaap_ProfitLoss	$ 29,286us-gaap_ProfitLoss
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(12,330)	(8,457)	1,680
Recognized net actuarial loss	10	306	466
Gain (loss) on unfunded pension obligations	(5,112)	4,113	(2,670)
Gain on pension curtailment	0	0	3,899
Other comprehensive income (loss), net of tax	(17,432)	(4,038)	3,375
Less: Other comprehensive income, net of tax attributable to noncontrolling interest	0	0	19
Comprehensive income (loss)	$ (4,571)us-gaap_ComprehensiveIncomeNetOfTax	$ 16,549us-gaap_ComprehensiveIncomeNetOfTax	$ 32,680us-gaap_ComprehensiveIncomeNetOfTax

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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Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, 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, attributable to parent entity.

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Amount after tax of gain (loss) adjustment to other comprehensive income (loss) resulting from settlement or curtailment of defined benefit pension and other postretirement defined benefit plans.

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

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Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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