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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Contract with Customer, Asset, Net, Total		$ 0		$ 0
Contract with Customer, Liability, Total		0		0
Revenues, Total		283,080	$ 294,845	880,561	$ 885,609
Disposal Group, Deferred Gain on Disposal							$ 8,100
Other Rental Property Income [Member]
Revenues, Total		$ 5,643	$ 5,593	16,755	$ 15,242
AOCI Attributable to Parent [Member]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax, Total							1,100
Investments in and Advances to Real Estate Joint Ventures [Member]
Disposal Group, Deferred Gain on Disposal							6,900
Other Liabilities [Member]
Disposal Group, Deferred Gain on Disposal							1,200
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ (1,100)	(1,136)	[1]
Accounting Standards Update 2017-05 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[1]						8,098
Accounting Standards Update 2017-05 [Member] | Gain on Sale of Operating Properties/ Change in Controls of Interests [Member]
Deconsolidation, Gain (Loss), Amount				6,800
Accounting Standards Update 2017-05 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ 8,100	$ 8,098	[1]
Three Months Ended September 30, 2017 [Member] | Reclassification of Reimbursement Income From Revenues From Rental Properties [Member]
Prior Period Reclassification Adjustment				59,500
Three Months Ended September 30, 2017 [Member] | Reclassification of Other Rental Property Income From Revenues From Properties [Member]
Prior Period Reclassification Adjustment				5,600
Nine Months Ended September 30, 2017 [Member] | Reclassification of Reimbursement Income From Revenues From Rental Properties [Member]
Prior Period Reclassification Adjustment				178,600
Nine Months Ended September 30, 2017 [Member] | Reclassification of Other Rental Property Income From Revenues From Properties [Member]
Prior Period Reclassification Adjustment				15,200
Reclassification of Personnel Costs Related to Property Management and Services From General Administrative to Operating and Maintenance [Member] | Three Months Ended September 30, 2017 [Member]
Prior Period Reclassification Adjustment				7,100
Reclassification of Personnel Costs Related to Property Management and Services From General Administrative to Operating and Maintenance [Member] | Nine Months Ended September 30, 2017 [Member]
Prior Period Reclassification Adjustment				$ 22,700
[1] Represents the impact of change in accounting principles for its respective Accounting Standard Updates ("ASU"). See Footnote 2 of the Notes to Condensed Consolidated Financial Statements for additional disclosure.

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