Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 24,257	$ 15,130
Other comprehensive income:
Unrealized gain on securities, net of tax	2,793	818
Comprehensive income	$ 27,050	$ 15,948