Debt - Inputs Used In Lattice Model (Details) (Notes, Notes Due February 1, 2033, USD $)	0 Months Ended	1 Months Ended	12 Months Ended
Aug. 29, 2013	Jan. 30, 2013 Rate	Jan. 31, 2013 Rate	Dec. 31, 2014 Rate	Dec. 31, 2013 Rate
Notes \| Notes Due February 1, 2033
Debt Instrument [Line Items]
Stock price		$ 6.20		$ 9.99	$ 8.44
Conversion Rate	141.48	141.4827	141.4827	141.4827	141.4827
Conversion Price		$ 7.07	$ 7.07	$ 7.07	$ 7.07
Maturity date				Feb. 01, 2033	Feb. 01, 2033
Risk-free interest rate		1.12%		1.40%	1.78%
Estimated stock volatility		40.00%		39.00%	55.00%
Estimated credit spread		9.44%		10.81%	8.28%
Interest rate of notes payable		3.00%	3.00%	3.00%	3.00%

The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk-free interest rate assumption used in valuing an instrument.

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Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

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Price of a single share of a number of saleable stocks of a company.

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