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Note 5 - Investments In and Advances to Real Estate Joint Ventures (Details Textual) $ in Thousands, ft² in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) ft² | Jun. 30, 2018 USD ($) ft² | Jun. 30, 2017 USD ($) | Mar. 31, 2018 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) ft²
Deferred Gain on Sale of Property |  |  |  |  |  |  | $ 6,900
Equity Method Investments |  | $ 568,698 | $ 568,698 |  |  |  | 483,861
Proceeds from Equity Method Investment, Distribution |  |  | $ 67,005 | $ 27,678 |  |  |
Accounting Standards Update 2017-05 [Member] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | [1] |  |  |  |  |  | $ 8,098
All Equity Method Investments [Member] |  |  |  |  |  |  |
Number of Real Estate Properties |  | 116 | 116 |  |  |  | 118
Gross Leasable Area | ft² |  | 23.9 | 23.9 |  |  |  | 23.5
Kim Pru and Kim Pru II [Member] |  |  |  |  |  |  |
Number of Joint Ventures |  | 4 | 4 |  |  |  |
Number Of Accounts |  | 4 | 4 |  |  |  |
Kim Pru [Member] |  |  |  |  |  |  |
Number of Joint Ventures |  | 3 | 3 |  |  |  |
Kim Pru II [Member] |  |  |  |  |  |  |
Deferred Gain on Sale of Property |  |  |  |  |  |  | $ 5,100
Other Joint Venture Programs [Member] |  |  |  |  |  |  |
Deferred Gain on Sale of Property |  |  |  |  |  |  | $ 1,800
Proceeds from Equity Method Investment, Distribution |  | $ 3,600 |  |  |  |  |
Other Joint Venture Programs [Member] | Accounting Standards Update 2017-05 [Member] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | $ 6,900 |
Investment in Unconsolidated Property, Unconsolidated 2017 [Member] |  |  |  |  |  |  |
Equity Method Investments |  | 62,400 | $ 62,400 |  | $ 62,400 |  |
Real Estate Joint Ventures [Member] | Operating Properties [Member] |  |  |  |  |  |  |
Number of Real Estate Properties, Interest Disposed of or Transferred |  |  | 4 | 6 |  |  |
Equity Method Investment, Sales Price |  | $ 37,900 | $ 37,900 | $ 49,300 |  |  |
Equity Method Investment, Realized Gain (Loss) on Disposal, Total |  |  | $ 3,500 | $ 100 |  |  |
Number of Real Estate Properties, Remaining Interest Acquired |  |  |  | 3 |  |  |
Business Combination, Consideration Transferred, Total |  |  |  | $ 320,100 |  |  |
[1] | Represents the impact of change in accounting principles for its respective Accounting Standard Updates ("ASU"). See Footnote 2 of the Notes to Condensed Consolidated Financial Statements for additional disclosure.

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- Definition Represents the amount of sale price for the entity's equity method investment. + References No definition available. + Details
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