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Note 5 - Dispositions of Real Estate and Assets Held-for-sale (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Real Estate Investment Property, Accumulated Depreciation [1] $ 2,278,292   $ 2,433,053
Operating Property in Chile [Member]      
Sales of Real Estate   $ 51,300  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax   19,600  
Gain (Loss) on Sale of Properties   1,800  
Land Parcels [Member]      
Sales of Real Estate 3,900 31,500  
Gain (Loss) on Sale of Properties $ 1,900 $ 4,300  
Number of Real Estate Properties 6 13  
Real Estate Held-for-sale [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]      
Number of Real Estate Properties     3
Real Estate Held-for-sale     $ 22,400
Real Estate Investment Property, Accumulated Depreciation     $ 16,800
[1] At December 31, 2017 and 2016, the Company had accumulated amortization relating to in-place leases, tenant relationships and above-market leases aggregating $459,211 and $409,062, respectively.