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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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