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Real Estate Disposition Activities (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Summary of income from discontinued operations |  |
Rental income | $ 579 | $ 14,002
Operating and other expenses | (269) | (3,986)
Depreciation expense |  | (4,270)
Income from discontinued operations | $ 310 | $ 5,746

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