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Dispositions (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes | $ | $ 28,343 | $ 27,432 | $ 47,321
Impairment of Real Estate | $ | $ 31,041 | $ 0 | $ 1,700
Operating Segments [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of Real Estate Properties Sold | property | 10 | 6 | 11
Land [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of Real Estate Properties Sold | property | 9 | 9 | 16

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- Definition This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. + References No definition available. + Details
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