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Note 7 - Investments and Advances In Real Estate Joint Ventures (Details Textual) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) ft²		Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)
Gross Leasable Area | ft²	2,875	[1]	2,665
Business Combination, Consideration Transferred	$ 688,326		$ 645,624
Other Liabilities	431,915		404,137
Equity Method Investments	483,861		$ 504,209
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] | CANADA
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ (4,800)
All Equity Method Investments [Member]
Gross Leasable Area | ft²	23,500		26,200
Kim Pru and Kim Pru II [Member]
Number of Joint Ventures	4
Number Of Accounts	4
Kim Pru [Member]
Number of Joint Ventures	3
CPP [Member] | Property Interest Adjacent to Existing Operating Property in Temecula, CA [Member]
Business Combination, Consideration Transferred			$ 27,500
Other Joint Venture Programs [Member]
Impairment of Long-Lived Assets to be Disposed of	$ 3,400
Other Liabilities	2,100		11,000
Real Estate Joint Ventures [Member] | Operating Properties [Member]
Business Combination, Consideration Transferred	$ 320,100		$ 590,100	$ 1,600,000
Number of Real Estate Properties, Interest Disposed of or Transferred	13		45	98
Equity Method Investment, Sales Price	$ 180,800		$ 1,100,000	$ 1,800,000
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 7,500		$ 151,200	$ 380,600
Number of Real Estate Properties, Remaining Interest Acquired	3		9	43
Real Estate Joint Ventures [Member] | Land Parcels [Member]
Number of Real Estate Properties, Interest Disposed of or Transferred			1
Number of Real Estate Properties, Remaining Interest Acquired				11
Real Estate Joint Ventures [Member] | Development Properties [Member]
Number of Real Estate Properties, Remaining Interest Acquired			1
[1] Gross leasable area ("GLA")

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- Definition

Represents the amount of sale price for the entity's equity method investment.

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The amount of floor space available to be rented in a commercial property.

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
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