Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income	$ 72,661	$ 31,605
Other comprehensive income, net of tax:
Unrealized gain on marketable securities, available for sale	39
Total comprehensive income	$ 72,700	$ 31,605