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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 22,049	$ 7,976	$ 48,197	$ 26,961
Other comprehensive (loss)/income
Change in unrealized gains/(losses) on available-for-sale debt securities, net of tax		(96)	477	(230)
Foreign currency translation adjustment	(88)	363	(395)	802
Other comprehensive (loss)/income	(88)	267	82	572
Comprehensive income	$ 21,961	$ 8,243	$ 48,279	$ 27,533

X

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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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