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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 Significant Shareholders [Member] | Dec. 31, 2011 Significant Shareholders [Member] | Dec. 31, 2010 Significant Shareholders [Member] | Dec. 31, 2012 Vorando Realty Trust [Member] | Dec. 31, 2010 Vorando Realty Trust [Member] | Dec. 31, 2009 Vorando Realty Trust [Member] | Dec. 31, 2011 Short-term Debt [Member] NLS Entity [Member] | Dec. 31, 2010 Short-term Debt [Member] NLS Entity [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Interest bearing, non-recourse mortgage notes, related party |  |  |  |  |  |  | $ 7,614 | $ 20,077
Rent revenue recognized | 842 | 864 | 905 |  |  |  |  |
Rent expense for corporate headquarters |  |  |  | $ 919 | $ 1,281 | $ 1,272 |  |

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