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Note 17 - Supplemental Schedule of Non-cash Investing/Financing Activities (Details) - Non-Cash Investing and Financing Activities - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Non-Cash Investing and Financing Activities [Abstract]      
Acquisition of real estate interests by assumption of mortgage debt $ 84,699 $ 210,232 $ 76,477
Acquisition of real estate interests through foreclosure     24,322
Acquisition of real estate interests by issuance of redeemable units/partnership interests   8,219 3,985
Acquisition of real estate interests through proceeds held in escrow 89,504 179,387 42,892
Proceeds held in escrow through sale of real estate interests 71,623 197,270  
Disposition of real estate interest by assignment of mortgage debt 47,742    
Disposition of real estate through the issuance of mortgage receivable 5,730 2,728 3,513
Investment in real estate joint venture through contribution of real estate   35,080  
Decrease of noncontrolling interests through sale of real estate   17,650  
Increase in capital expenditures accrual 8,700 11,373 996
Issuance of common stock 493 14,047 9,213
Surrender of common stock (5,682) (4,051) (3,891)
Declaration of dividends paid in succeeding period 115,182 111,143 104,496
Consolidation of Joint Ventures:      
Increase in real estate and other assets 1,039,335 687,538 228,200
Increase in mortgage payable and other liabilities $ 750,135 $ 492,318 $ 206,489