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Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 22,670	$ 13,130	$ 66,590	$ 34,970
Other comprehensive income
Defined benefit pension and postretirement plans	180	170	3,030	500
Foreign currency translation	(2,210)	910	(6,300)	4,640
Derivative instruments	50	2,540	1,720	2,520
Total other comprehensive income (loss)	(1,980)	3,620	(1,550)	7,660
Total comprehensive income	$ 20,690	$ 16,750	$ 65,040	$ 42,630

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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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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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