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Note 7 - Investments In and Advances to Real Estate Joint Ventures (Details Textual) ft² in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($)
Gross Leasable Area (Square Foot) | ft² |  | 290 |
Proceeds from Equity Method Investment, Distribution | $ 149,022 | $ 93,877 | $ 104,626
Other Liabilities, Total | 324,538 | 346,183 |
Equity Method Investments | $ 590,700 | 578,100 |
Prudential Investment Program [Member] |  |  |
Tangible Asset Impairment Charges, Total |  | $ 29,900 |
All Equity Method Investments [Member] |  |  |
Number of Real Estate Properties | 97 | 98 |
Gross Leasable Area (Square Foot) | ft² | 21,200 | 21,300 |
Prudential Investment Program [Member] |  |  |
Tangible Asset Impairment Charges, Total |  | $ 3,700 |
Other Joint Venture Programs [Member] |  |  |
Proceeds from Equity Method Investment, Distribution |  |  | 3,600
Impairment of Long-Lived Assets to be Disposed of |  |  | $ 5,200
Other Liabilities, Total | $ 3,700 | $ 3,500 |
Real Estate Joint Ventures [Member] | Operating Properties [Member] |  |  |
Number of Real Estate Properties, Interest Disposed of or Transferred |  | 9 | 11
Equity Method Investment, Sales Price |  | $ 247,400 | $ 213,500
Equity Method Investment, Realized Gain (Loss) on Disposal, Total |  | $ 14,400 | $ 18,500
KIR [Member] |  |  |
Equity Method Investment, Ownership Percentage | 48.60% |  |

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