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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 7,584	$ 3,397	$ 13,729	$ 7,657
Other comprehensive income, net of tax
Foreign currency translation	4	2	6	14
Change in fair value of marketable securities	39	36	163	107
Adjustment for net losses realized and included in net income		56	10	65
Total change in unrealized gains on marketable securities	39	92	173	172
Other comprehensive income	43	94	179	186
Comprehensive income	$ 7,627	$ 3,491	$ 13,908	$ 7,843

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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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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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