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Note 5 - Investments In and Advances to Real Estate Joint Ventures (Details Textual) $ in Thousands, ft² in Millions, a in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) a | Mar. 31, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) ft²
Deferred Gain on Sale of Property |  |  |  |  | $ 6,900
Equity Method Investments |  | $ 560,068 |  |  | 483,861
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 |  | 118 |  |  | 118
Gross Leasable Area |  | 24.1 |  |  | 23.5
Kim Pru and Kim Pru II [Member] |  |  |  |  |
Number of Joint Ventures |  | 4 |  |  |
Number Of Accounts |  | 4 |  |  |
Kim Pru [Member] |  |  |  |  |
Number of Joint Ventures |  | 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
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 |  |  |
Real Estate Joint Ventures [Member] | Operating Properties [Member] |  |  |  |  |
Number of Real Estate Properties, Interest Disposed of or Transferred |  | 2 | 5 |  |
Equity Method Investment, Sales Price |  | $ 17,100 | $ 47,700 |  |
Equity Method Investment, Realized Gain (Loss) on Disposal, Total |  | $ 2,100 | $ 900 |  |
Number of Real Estate Properties, Remaining Interest Acquired |  |  | 2 |  |
Business Combination, Consideration Transferred, Total |  |  | $ 15,400 |  |
[1] | Represents the impact of change in accounting policies 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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- Definition The amount of floor space available to be rented in a commercial property. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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