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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 36,633	$ 27,199	$ 26,155
Other comprehensive income/(loss)
Change in unrealized gains/(losses) on available-for-sale debt securities, net of tax	477	(314)	(163)
Foreign currency translation adjustment	(301)	649	245
Other comprehensive income	176	335	82
Comprehensive income	$ 36,809	$ 27,534	$ 26,237

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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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