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Note 18 - Supplemental Schedule of Non-cash Investing / Financing Activities - Non-cash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Acquisition of real estate interests by assumption of mortgage debt $ 33,174 $ 84,699 $ 210,232
Acquisition of real estate interests by issuance of redeemable units 8,219
Acquisition of real estate interests through proceeds held in escrow 66,044 89,504 179,387
Proceeds held in escrow through sale of real estate interests 66,044 71,623 197,270
Disposition of real estate interests by assignment of debt 47,742
Disposition of real estate interests through the issuance of mortgage receivable 5,730 2,728
Disposition of real estate interests by foreclosure of debt 22,080
Forgiveness of debt due to foreclosure 26,000
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 15,078 8,581 12,622
Issuance of common stock 85 493 14,047
Surrender of common stock (7,008) (5,682) (4,051)
Declaration of dividends paid in succeeding period 124,517 115,182 111,143
Increase in real estate and other assets 407,813 1,039,335 687,538
Increase in mortgages payable, other liabilities and noncontrolling interests $ 268,194 $ 750,135 $ 492,318