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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 17,835	$ 20,058	$ 13,181
Other comprehensive income, net of tax
Change in foreign currency translation, net of tax	7	64
Change in fair value of marketable securities, net of tax	(175)	(245)	207
Adjustment for net (gains)/losses realized and included in net income, net of tax	65	(316)	(475)
Total change in unrealized losses on marketable securities, net of tax	(110)	(561)	(268)
Other comprehensive loss	(103)	(497)	(268)
Comprehensive income	$ 17,732	$ 19,561	$ 12,913

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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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