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Summary of Significant Accounting Policies (Details Textual) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2009 | Sep. 30, 2008 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2005
Additional Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Above below market lease amortization |  |  | $ 1,431 | $ 2,857 | $ 4,273 |
Cash and liquid investment initial maturity |  |  | Three months or less |  |  |
Accumulated amortization deferred financing cost |  |  | 13,086 | 16,565 |  |
Allowance For Doubtful Accounts Receivable |  |  | 2,675 | 3,001 |  |
Deferred rent receivable allowance amount |  |  | 2,302 | 1,855 |  |
Minimum percentage of taxable income to be distributed |  |  | 90.00% |  |  |
Refunds from Internal Revenue Services (IRS) | 40,418 | 3,767 |  |  | 40,418 |
Franchise tax reserve |  |  | (745) |  |  | 745
In-Place Lease and Customer Relationship [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Amortization expense |  |  | $ 11,076 | $ 14,185 | $ 16,162 |

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