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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net Income (Loss)	$ (19,342)	$ 23,840	$ 35,229
Other Comprehensive Income (Loss), net of tax
Net unrealized gains (losses) on available-for-sale securities	(3,130)	2,163	(1,528)
Defined benefit plan adjustments	(3,755)	731	(1,122)
Foreign currency translation	(4,236)	5,999	(569)
Other Comprehensive Income (Loss), net of tax	(11,121)	8,893	(3,219)
Comprehensive Income (Loss), net of tax	$ (30,463)	$ 32,733	$ 32,010

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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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