Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Benefit from (provision for) income taxes	$ (11,854,000)	$ (8,251,000)	$ (1,095,000)	$ (12,725,000)
Effective income tax rate	(39.70%)	37.50%	14.60%	37.40%
Income tax benefit from change			$ 2,200,000