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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 6,065	$ 5,506	$ 13,722	$ 16,198
Other comprehensive income, net of tax
Change in foreign currency translation, net of tax	(3)		11
Change in fair value of marketable securities, net of tax	(52)	(294)	55	(282)
Adjustment for net (gains)/losses realized and included in net income, net of tax		(9)	65	(109)
Total change in unrealized losses on marketable securities, net of tax	(52)	(303)	120	(391)
Other comprehensive income (loss)	(55)	(303)	131	(391)
Comprehensive income	$ 6,010	$ 5,203	$ 13,853	$ 15,807

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- Definition

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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