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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
		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

X

- Definition

The average remaining term of the joint venture investments.

+ References

No definition available.

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- Definition

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+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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 2: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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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