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
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 4,654	$ 19,248	$ (2,514)	$ 29,744
Other comprehensive income (loss), net of tax:
Change in unrealized gains/losses on available-for-sale securities, net of tax	48	(237)	648	212
Change in unrealized gains/losses on derivative contracts, net of tax	(2,143)	5,456	1,349	5,832
Other comprehensive income (loss)	(2,095)	5,219	1,997	6,044
Total comprehensive income (loss), net of tax	$ 2,559	$ 24,467	$ (517)	$ 35,788