CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Net income (loss)	$ 37,027	$ (10,937)	$ 8,779
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	260	395	(173)
Gain (loss) on investments	4	(1)	12
Other comprehensive income (loss) before tax	264	394	(161)
Income tax expense (benefit) related to items of other comprehensive income (loss)	8	(16)	2
Other comprehensive income (loss) net of tax	256	410	(163)
Comprehensive income (loss)	$ 37,283	$ (10,527)	$ 8,616