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Property Dispositions (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) property | Jun. 30, 2016 USD ($) property | Jun. 30, 2017 USD ($) property | Jun. 30, 2016 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Document Fiscal Year Focus |  |  | 2017 |
Proceeds from sale of real estate investments | $ 13,481 | $ 4,384 | $ 15,230 | $ 38,705
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes | 4,366 | 548 | 4,781 | 13,417
Provision for impairment | $ 0 | $ 0 | $ 0 | $ (1,666)
Wholly Owned Properties [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 100.00% | 100.00% | 100.00% | 100.00%
Parent Company [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of real estate investments |  |  | $ 15,344 | $ 36,751
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes | $ 4,366 | $ 548 | 4,781 | 13,417
Revenues | 261,305 | 152,412 | 457,436 | 302,041
Operating expenses | 180,568 | 99,567 | 381,021 | 195,444
Provision for impairment | $ 0 | $ 0 | $ 0 | $ (1,666)
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 | 1 | 1 | 1 | 4
Land [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of Real Estate Properties Sold | property | 5 | 5 | 7 | 10

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