Income Taxes - Additional Information (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Operating loss carry forwards, federal	$ 85.2	$ 83.5
Operating loss carry forwards, state	601.4	596.8
Operating loss carry forwards, expiration year	2031
Deferred tax assets, valuation allowance adjustment	(1.5)
Deferred tax asset, valuation allowance	91.1	92.6
Deferred tax asset, provision for valuation allowance	$ 2.8	$ 3.3