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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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	$ 20,394	$ 4,828	$ 12,488	$ 6,501
Other comprehensive income (loss), net of applicable taxes:
Foreign currency translation adjustment	422	(3,892)	260	(2,452)
Unrealized gain on short-term investments	232	0	647	0
Total other comprehensive income (loss)	654	(3,892)	907	(2,452)
Comprehensive income	$ 21,048	$ 936	$ 13,395	$ 4,049

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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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