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Note 7 - Investments in and Advances to Real Estate Joint Ventures - Joint Venture Investments Accounted for Under the Equity Method, Debt Details (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Mortgage and notes payable |  | $ 1,700.2 | $ 2,063.0
Kim Pru and Kim Pru II [Member] |  |  |
Mortgage and notes payable |  | $ 625.7 | $ 647.4
Weighted average interest rate |  | 3.59% | 3.07%
Weighted average remaining term (Month) | [1] | 4 years 354 days | 5 years 225 days
KIR [Member] |  |  |
Mortgage and notes payable |  | $ 702.0 | $ 746.5
Weighted average interest rate |  | 4.60% | 4.64%
Weighted average remaining term (Month) | [1] | 3 years 345 days | 4 years 207 days
CPP [Member] |  |  |
Mortgage and notes payable |  | $ 84.9 | $ 84.8
Weighted average interest rate |  | 2.91% | 2.17%
Weighted average remaining term (Month) | [1] | 120 days | 1 year 120 days
Other Joint Venture Programs [Member] |  |  |
Mortgage and notes payable |  | $ 287.6 | $ 584.3
Weighted average interest rate |  | 4.41% | 5.40%
Weighted average remaining term (Month) | [1] | 2 years 96 days | 1 year 342 days
[1] | Average remaining term includes extensions

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