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Real Estate (Dispositions) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 properties | Sep. 30, 2012 properties | Sep. 30, 2013 properties | Sep. 30, 2012 properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of sold properties | 22 |  | 8 |  | 31 | 18 |
Gain (loss) on disposition of assets, discontinued operations | $ 1,228 |  | $ 1,694 |  | $ 4,402 | $ 4,446 |
Gain (loss) on disposition of assets noncontrolling interest portion discontinued operations | 0 |  | 0 |  | 153 | 0 |
Assets Held-for-sale [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain (loss) on disposition of assets, discontinued operations | $ 1,228 | [1] | $ 1,694 | [1] | $ 4,249 | $ 4,446 | [1]
[1] | None of the gains from property sales for the period were reported in continuing operations.

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