Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes - Additional Information (Details) (USD $)	3 Months Ended
Income Taxes - Additional Information (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Deferred tax assets, valuation allowance		$ 6,200,000	$ 93,100,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(89,300,000)
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		0
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 323,900,000