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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,673	$ 15,557
Other comprehensive income, net of applicable taxes:
Foreign currency translation adjustment	1,440	1,048
Unrealized loss on short-term investments	0	(30)
Total other comprehensive income	1,440	1,018
Comprehensive income	$ 3,113	$ 16,575

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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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