Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Consolidated Statements of Comprehensive Income
Net income	$ 4,825	$ 738
Other comprehensive income:
Unrealized net gain on marketable securities	656	89
Other comprehensive income:	656	89
Comprehensive income	$ 5,481	$ 827