Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 26,155	$ 80,052	$ 61,051
Other comprehensive income/(loss)
Unrealized losses on available-for-sale securities, net of tax	(163)
Foreign currency translation adjustment	245	(73)	(53)
Other comprehensive income/(loss)	82	(73)	(53)
Comprehensive income	$ 26,237	$ 79,979	$ 60,998