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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) shares | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Real Estate Under Development Period After Completion Cessation of Cost Capitalization |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Financing Receivable Past Due Term |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |
Number of Portfolio Segments |  | 1 |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Capitalized Computer Software, Net, Ending Balance |  | $ 4,300 |  |  |  | $ 6,200 |  |  |  |  |  | $ 4,300 | $ 6,200 |  |  |  |
Capitalized Computer Software, Amortization |  |  |  |  |  |  |  |  |  |  |  | 5,300 | 4,600 |  | $ 8,000 |  |
Revenues, Total |  | $ 284,201 | $ 283,080 | $ 293,403 | $ 304,078 | 315,225 |  | $ 294,845 | $ 297,176 | $ 293,588 |  | $ 1,164,762 | 1,200,834 |  | 1,170,792 |  |
Disposal Group, Deferred Gain on Disposal |  |  |  |  |  | 8,100 |  |  |  |  |  |  | 8,100 |  |  |  |
Number of Equity Participation Plans |  | 2 |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Restricted Stock [Member] | Share-based Compensation Award, Vesting on Fourth or Fifth Anniversary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Restricted Stock [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |
Restricted Stock [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Restricted Stock [Member] | Share-based Compensation Award, Vesting After the Fifth Anniversary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Restricted Stock [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Prior Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  | 47,000,000 |  |  |  |  |  |  |  |  |  | 47,000,000 |  |  |  |  |
The 2010 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  | 10,000,000 |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |
Billed Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable, Ending Balance |  | $ 10,300 |  |  |  | 9,200 |  |  |  |  |  | $ 10,300 | 9,200 |  |  |  |
Straight-line Rent Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable, Ending Balance |  | 10,200 |  |  |  | 7,900 |  |  |  |  |  | 10,200 | 7,900 |  |  |  |
Other Rental Property Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  | $ 20,877 | 23,552 |  | $ 20,021 |  |
After Issuance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Units Redemption Period |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | (1,136) | [1] |  |  |  |  |  | (1,136) | [1] |  |  | $ (1,100)
Accounting Standards Update 2017-05 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | [1] |  |  |  |  | 8,098 |  |  |  |  |  |  | 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 |  |  |  |  |  | 8,098 | [1] |  |  |  |  |  | 8,098 | [1] |  |  | $ 8,100
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax, Total |  | $ 1,100 |  |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |  |
Investments in and Advances to Real Estate Joint Ventures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Deferred Gain on Disposal |  |  |  |  |  | 6,900 |  |  |  |  |  |  | 6,900 |  |  |  |
Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Deferred Gain on Disposal |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  | $ 1,200 |  |  |  |
Minimum [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Minimum [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Minimum [Member] | Computer Software, Intangible Asset [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Minimum [Member] | Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Indirect Cost |  |  |  |  |  |  |  |  |  |  | $ 11,000 |  |  |  |  |  |
Minimum [Member] | Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 80,000 |
Operating Lease, Liability, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000 |
Maximum [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Maximum [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Maximum [Member] | Computer Software, Intangible Asset [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Maximum [Member] | Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Indirect Cost |  |  |  |  |  |  |  |  |  |  | $ 14,000 |  |  |  |  |  |
Maximum [Member] | Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110,000 |
Operating Lease, Liability, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110,000 |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 50 years |  |  |  |  |
Reclassification of Reimbursement Income From Revenues From Rental Properties [Member] | Year Ended December 31, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  | $ 247,600 |  |  |  |  |
Reclassification of Reimbursement Income From Revenues From Rental Properties [Member] | Year Ended December 31, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  | 239,000 |  |  |  |  |
Reclassification of Other Rental Property Income From Revenues From Properties [Member] | Year Ended December 31, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  | 23,600 |  |  |  |  |
Reclassification of Other Rental Property Income From Revenues From Properties [Member] | Year Ended December 31, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |
Reclassification of Personnel Costs Related to Property Management and Services From General Administrative to Operating and Maintenance [Member] | Year Ended December 31, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  | 26,800 |  |  |  |  |
Reclassification of Personnel Costs Related to Property Management and Services From General Administrative to Operating and Maintenance [Member] | Year Ended December 31, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  | 30,500 |  |  |  |  |
Reclassification of Gain on Sale of Operating Properties/Change in Control of Interests to (Provision)/Benefit for Income Taxes, Net [Member] | Year Ended December 31, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  | $ 6,000 |  |  |  |  |
[1] | Represents the impact of change in accounting principles for its respective Accounting Standard Updates ("ASU"). See Footnote 1 of the Notes to Consolidated Financial Statements for additional disclosure.

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