Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (30,351)	$ (5,538)	$ 38,059
Other comprehensive (loss) income:
Unrealized (loss) gain on investments, net of taxes	(863)	505	(42)
Unrealized (loss) gain on currency translation	(2)	(8)	2
Other comprehensive (loss) income	(865)	497	(40)
Comprehensive (loss) income	$ (31,216)	$ (5,041)	$ 38,019