Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$ 54,455	$ 23,503	$ (4,257)
Other comprehensive loss, net of tax
Unrealized loss on marketable securities	(18)
Comprehensive income (loss)	$ 54,437	$ 23,503	$ (4,257)