Income Taxes - The provision (benefit) for income taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Current Federal Tax Expense (Benefit)	$ 342	$ 0	$ 0
State	1,093	(713)	0
Foreign	4,125	1,394	45
Current income tax provision (benefit)	5,560	681	45
Deferred:
Federal	0	(1)	(369)
State	(28)	270	1
Foreign	1,250	(558)	(3,685)
Deferred income tax provision (benefit)	1,222	(289)	(4,053)
Tax provision (benefit):
Federal	342	(1)	(369)
State	1,065	(443)	1
Foreign	5,375	836	(3,640)
Income tax provision (benefit)	$ 6,782	$ 392	$ (4,008)