CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) [Abstract]
Net income (loss)	$ (56,855)	$ 35,648	$ (119,772)	$ 18,931
Unrealized losses on securities, net of tax	(10,738)	(28,703)	(13,288)	(21,336)
Comprehensive income (loss)	$ (67,593)	$ 6,945	$ (133,060)	$ (2,405)