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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 92,617	$ 89,734	$ 67,888
Other comprehensive income:
Translation adjustment, net of tax expense of $0, ($222) and ($57) for 2017, 2016 and 2015, respectively	21,418	(3,920)	(20,939)
Unamortized pension adjustments, net of tax benefit of $37, $88, and $82 for 2017, 2016 and 2015, respectively	(944)	(474)	(457)
Comprehensive income	$ 113,091	$ 85,340	$ 46,492

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- Definition

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, attributable to parent entity.

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