CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income (loss)	$ 43,313	$ (29,781)	$ 70,726
Unrealized gains (losses) on available-for-sale securities:
Unrealized gains (losses) during period prior to reclassification adjustments, net of taxes	(37)	58	(2)
Less Reclassification adjustments for gains included to net income (loss), net of taxes	1	14	80
Net unrealized gains (losses) on available-for-sale securities	(38)	44	(82)
Comprehensive income (loss)	$ 43,275	$ (29,737)	$ 70,644