Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (7,382)us-gaap_NetIncomeLoss	$ 4,153us-gaap_NetIncomeLoss	$ (18,035)us-gaap_NetIncomeLoss
Other comprehensive (loss) income before income taxes:
Foreign currency translation adjustments	(39,751)	(3,389)	(6,904)
Unrealized gain (loss) on derivative instruments	127	409	(124)
Defined benefit pension plan
Amortization of prior service cost	0	11	13
Amortization of net loss	1,124	2,323	2,199
Net (loss) gain on liability	(27,455)	9,534	(8,969)
Net gain (loss) on asset	3,827	4,901	3,193
Curtailment/settlement gain (loss)	258	190	(697)
Currency translation impact	2,895	(181)	(669)
Defined benefit pension plan, net	(19,351)	16,778	(4,930)
Other comprehensive (loss) income, before income taxes	(58,975)	13,798	(11,958)
Income tax benefit (provision) related to components of other comprehensive (loss) income	3,089	(1,957)	1,611
Other comprehensive (loss) income, net of tax	(55,886)	11,841	(10,347)
Comprehensive (loss) income, net of tax	$ (63,268)us-gaap_ComprehensiveIncomeNetOfTax	$ 15,994us-gaap_ComprehensiveIncomeNetOfTax	$ (28,382)us-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 before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, on 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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