Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
(Benefit from) provision for income taxes	$ (846,000)	$ (17,135,000)	$ (1,233,000)	$ (18,230,000)
Unrecognized tax benefits	33,800,000		33,800,000
Increase in uncertain tax positions resulting from prior period tax positions	7,400,000
Increase in uncertain tax positions resulting from current period tax positions	11,200,000
Decrease in uncertain tax positions resulting from prior period tax positions	3,300,000
Reduction in unrecognized tax benefits	$ 1,500,000		$ 1,500,000