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Note 5 - Investments in and Advances to Real Estate Joint Ventures - Joint Venture Investments Accounted for Under the Equity Method, Debt Details (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Mortgage and notes payable		$ 1,888.8	$ 1,700.2
Kim Pru and Kim Pru II [Member]
Mortgage and notes payable		$ 624.4	$ 625.7
Weighted average interest rate		3.77%	3.59%
Weighted average remaining term (Month)	[1]	4 years 264 days	4 years 354 days
KIR [Member]
Mortgage and notes payable		$ 698.3	$ 702.0
Weighted average interest rate		4.62%	4.60%
Weighted average remaining term (Month)	[1]	3 years 258 days	3 years 345 days
CPP [Member]
Mortgage and notes payable		$ 85.0	$ 84.9
Weighted average interest rate		3.22%	2.91%
Weighted average remaining term (Month)	[1]	30 days	120 days
Other Joint Venture Programs [Member]
Mortgage and notes payable		$ 481.1	$ 287.6
Weighted average interest rate		4.33%	4.41%
Weighted average remaining term (Month)	[1]	6 years 171 days	2 years 96 days
[1] Includes extension options

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The average remaining term of the joint venture investments.

+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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