Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 8,608	$ 1,993	$ 15,452	$ 5,107
Other comprehensive income (loss)
Adoption of ASU 2018-02			(315)
Foreign currency translation adjustment	(123)	210	(1,843)	1,111
Pension liability, net of tax expense of $67 in 2018			201
Total other comprehensive income (loss)	(123)	210	(1,957)	1,111
Comprehensive income	$ 8,485	$ 2,203	$ 13,495	$ 6,218

New accounting pronouncement or change in accounting principle effect of change in other comprehensive income (loss).

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

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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