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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 6,686	$ 6,065	$ 20,415	$ 13,722
Other comprehensive income, net of tax
Foreign currency translation	7	(3)	13	11
Change in fair value of marketable securities	26	(52)	189	55
Adjustment for net losses realized and included in net income			10	65
Total change in unrealized gains on marketable securities	26	(52)	199	120
Other comprehensive income	33	(55)	212	131
Comprehensive income	$ 6,719	$ 6,010	$ 20,627	$ 13,853

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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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