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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 1,555	$ 7,788	$ (11,761)	$ 6,055
Other comprehensive income (loss), net of taxes:
Foreign currency translation	594	(3,394)	164	(1,691)
Net change in market value of investments		62		(53)
Other comprehensive income (loss)	594	(3,332)	164	(1,744)
Comprehensive income (loss)	$ 2,149	$ 4,456	$ (11,597)	$ 4,311

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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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