Long-Term Incentive Awards - Weighted-average Assumptions Used in Valuation of Market-based Performance Awards Requiring Cash Settlement Using Monte Carlo Simulation (Details) (2004 Amended and Restated Long-Term Incentive Plan, Performance Retention Awards, USD $)	3 Months Ended
Mar. 31, 2013
2004 Amended and Restated Long-Term Incentive Plan \| Performance Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%
Expected price volatility	65.00%
Risk-free interest rate	0.10%
Stock price (in dollars per share)	$ 7.42
Fair value (in dollars per share)	$ 4.51

Long-Term Incentive Awards - Weighted-average Assumptions Used in Valuation of Market-based Performance Awards Requiring Cash Settlement Using Monte Carlo Simulation (Details) (2004 Amended and Restated Long-Term Incentive Plan, Performance Retention Awards, USD $)

3 Months Ended

Mar. 31, 2013

2004 Amended and Restated Long-Term Incentive Plan | Performance Retention Awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Dividend yield

0.00%

Expected price volatility

65.00%

Risk-free interest rate

0.10%

Stock price (in dollars per share)

$ 7.42

Fair value (in dollars per share)

$ 4.51

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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