Note 5 - Discontinued Operations and Assets Held-for-sale (Details)		12 Months Ended
		Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 30, 2014 USD ($)	Dec. 30, 2013 USD ($)
Note 5 - Discontinued Operations and Assets Held-for-sale (Details) [Line Items]
Foreign Currency Transaction Gain (Loss), Realized	[1]		$ (92,900,000)	$ (5,100,000)
Real Estate Investment Property, Accumulated Depreciation	[2]	$ 2,115,320,000	1,955,406,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Note 5 - Discontinued Operations and Assets Held-for-sale (Details) [Line Items]
Real Estate Held-for-sale				70,300,000	$ 239,900,000	$ 178,400,000
Real Estate Investment Property, Accumulated Depreciation				8,100,000	$ 76,500,000	$ 19,200,000
Impairment of Real Estate			56,200,000	25,200,000
Fair Value of Real Estate			316,500,000	$ 158,600,000
Operating Properties [Member]
Note 5 - Discontinued Operations and Assets Held-for-sale (Details) [Line Items]
Number of Real Estate Properties				4
Impairment of Real Estate			$ 178,000,000
Operating Properties [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Note 5 - Discontinued Operations and Assets Held-for-sale (Details) [Line Items]
Number of Real Estate Properties			0	5	35	19
Number of Real Estate Properties, Impaired				8	11
undefined			35	15
Operating Properties [Member] | Classified as Held-for-sale in 2012 [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Note 5 - Discontinued Operations and Assets Held-for-sale (Details) [Line Items]
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Remaining Operating Properties [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Note 5 - Discontinued Operations and Assets Held-for-sale (Details) [Line Items]
Number of Real Estate Properties			24
Impairment of Real Estate			$ 0
Operating Properties Remaining From 2013 [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Note 5 - Discontinued Operations and Assets Held-for-sale (Details) [Line Items]
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[1] Due to the substantial liquidation of its investment in Mexico, the Company recognized a loss from foreign currency translation related to consolidated properties in the amount of $92.9 million, before noncontrolling interest of $5.8 million. (See footnote 22 for additional disclosure).In addition to the impairment charges above, the Company recognized pretax impairment charges during 2015, 2014 and 2013 of $22.2 million, $54.5 million (including $47.3 million in cumulative foreign currency translation loss relating to the Company's substantial liquidation of its investment in Mexico), and $29.5 million, respectively, relating to certain properties held by various unconsolidated joint ventures in which the Company holds noncontrolling interests. These impairment charges are included in Equity in income of joint ventures, net in the Company's Consolidated Statements of Income (see Footnote 7).The Company will continue to assess the value of its assets on an on-going basis. Based on these assessments, the Company may determine that one or more of its assets may be impaired and would therefore write-down its carrying basis accordingly.

[2] At December 31, 2015 and 2014, the Company had accumulated amortization relating to in-place leases, tenant relationships and above-market leases aggregating $357,581 and $290,748, respectively.