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Derivatives (Details 3) (USD $) In Thousands, unless otherwise specified |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Mark-to-Market on Series F Agreement [Member] | Dec. 31, 2010 Mark-to-Market on Series F Agreement [Member]
Reconciliation of liabilities classified as Level 3 |  |  |  |  |
Ending asset balance |  |  | $ 93 |  |
Ending liability balance | (1,667) | (523) |  |  |
Unrealized losses |  |  |  |  |
Mark-to-Market on Series F Agreement |  |  |  | (1,144) | (616)
Ending liability balance | $ (1,667) | $ (523) |  |  |

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