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Supplemental Information to Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Exchange of Units for common stock |  |
Conversion of Units to Common Stock |  |
Supplemental schedule of non-cash investing and financing activities |  |
Distribution payable on preferred stock | 5,214 |
Write-off of fully depreciated assets | (13,196) | (13,514)
Mortgage loan payable assumed in conjunction with a property acquisition | (12,026) |
Notes receivable issued in conjunction with certain property sales |  | 1,029
Noncontrolling Interest [Member] |  |
Exchange of Units for common stock |  |
Conversion of Units to Common Stock | (99) |
Common Stock [Member] |  |
Exchange of Units for common stock |  |
Conversion of Units to Common Stock |  |
Additional Paid-in Capital [Member] |  |
Exchange of Units for common stock |  |
Conversion of Units to Common Stock | $ 99 |

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