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Note 17 - Supplemental Schedule of Non-cash Investing / Financing Activities - Non-cash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquisition of real estate interests by assumption of mortgage debt $ 45,299 $ 33,174 $ 84,699
Acquisition of real estate interests through proceeds held in escrow 162,396 66,044 89,504
Proceeds deposited in escrow through sale of real estate interests 162,396 66,044 71,623
Disposition of real estate interests by assignment of debt 47,742
Disposition of real estate interests through the issuance of mortgage receivable 5,730
Disposition of real estate interests by foreclosure of debt 22,080
Forgiveness of debt due to foreclosure 26,000
Capital expenditures accrual 74,123 38,044 22,967
Issuance of common stock 85 493
Surrender of restricted common stock (5,699) (7,008) (5,682)
Declaration of dividends paid in succeeding period 128,892 124,517 115,182
Change in noncontrolling interest due to liquidation of partnership 64,948
Deemed contribution from noncontrolling interest 10,000
Increase in real estate and other assets 325,981 407,813 1,039,335
Increase in mortgages payable, other liabilities and noncontrolling interests $ 258,626 $ 268,194 $ 750,135