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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 35,229	$ 18,646	$ 44,620
Other Comprehensive Loss, net of tax:
Net unrealized losses on available-for-sale securities	(1,528)	(7,032)	(1,773)
Defined benefit plan adjustments	(1,122)	1,862	(4,866)
Foreign currency translation	(569)	(3,724)	(4,189)
Other Comprehensive Loss, net of tax	(3,219)	(8,894)	(10,828)
Comprehensive Income, net of tax	$ 32,010	$ 9,752	$ 33,792

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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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