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v2.4.0.6

Stock Based Compensation - Restricted and Unrestricted Shares with Market Conditions (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Relative TSR [Member] | Restricted Share Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted and Unrestricted Share Awards, Grant Date Fair Value | $ 1,066 |  |
Unamortized Value Of Restricted and Unrestricted Shares |  | 501 | 742
Relative TSR [Member] | Unrestricted Share Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted and Unrestricted Share Awards, Grant Date Fair Value | 1,066 |  |
Unamortized Value Of Restricted and Unrestricted Shares |  | 338 | 826
Absolute TSR [Member] | Restricted Share Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted and Unrestricted Share Awards, Grant Date Fair Value | 365 |  |
Unamortized Value Of Restricted and Unrestricted Shares |  | 172 | 254
Absolute TSR [Member] | Unrestricted Share Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted and Unrestricted Share Awards, Grant Date Fair Value | 365 |  |
Unamortized Value Of Restricted and Unrestricted Shares |  | $ 116 | $ 283

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