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Stock-Based Compensation (Details) (USD $) | 12 Months Ended | 54 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | May 31, 2016 | Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Stock-based Compensation | $ 2,379,000 | $ 150,000 | $ 0 | $ 4,800,000 |
Restricted Stock Shares Authorized |  |  |  |  | 900,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  | 351,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $ 2,200,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 13.57 | $ 13.57 | $ 0.00 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |  |  |
Unvested at beginning of year, Number of Restricted Stock Awards (in shares) | 351,000 | 0 |  |  |
Unvested at beginning of year, Weighted Average Grant Date Fair Value (in dollars) | $ 13.57 | $ 0.00 |  | $ 13.57 |
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 0 | 351,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 0.00 | $ 13.57 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | (70,000) | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ 13.57 | $ 0.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | (4,000) | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value | $ 13.57 | $ 0.00 |  |  |
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares) | 277,000 | 351,000 | 0 |  |
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars) | $ 13.57 | $ 13.57 | $ 0.00 |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years) |  | 1 year 9 months 22 days |  | 4 years 5 months 15 days |

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