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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 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 years
Number of Portfolio Segments	1
Capitalized Computer Software, Net, Ending Balance	$ 14,500	$ 4,300
Capitalized Computer Software, Amortization	1,700	5,300	$ 4,600
Contract with Customer, Liability, Total	0
Contract with Customer, Asset, after Allowance for Credit Loss, Total	0
Cumulative Effect of New Accounting Principle in Period of Adoption			(65,421)
Disposal Group, Deferred Gain on Disposal			8,100
Operating Lease, Right-of-Use Asset	99,125	0
Operating Lease, Liability, Total	$ 92,711	0
Number of Equity Participation Plans	2
Revenue from Contract with Customer, Including Assessed Tax	$ 16,550	15,159	17,049
Operating Lease, Lease Income, Total	$ 1,142,334	1,149,603	1,183,785
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration 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 Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Restricted Stock [Member] \| Share-based Payment Arrangement, 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%
Prior Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized \| shares	47,000,000
The 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized \| shares	10,000,000
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
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			0
After Issuance [Member]
Redeemable Noncontrolling Units Redemption Period	1 year
Accounting Standards Update 2017-05 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			8,098
Accounting Standards Update 2017-05 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			8,098		$ 8,100
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset				$ 106,000
Intangible Assets, Net (Excluding Goodwill), Total				7,300
Operating Lease, Liability, Total				$ 98,700
Accounting Standards Update 2014-09 [Member] \| Reimbursement Income [Member]
Revenue from Contract with Customer, Including Assessed Tax		(246,400)	(247,600)
Operating Lease, Lease Income, Total		246,400	247,600
Accounting Standards Update 2014-09 [Member] \| Other Rental Property Income [Member]
Revenue from Contract with Customer, Including Assessed Tax		(20,900)	(23,600)
Operating Lease, Lease Income, Total		$ 20,900	$ 23,600
Minimum [Member] \| Share-based Payment Arrangement, 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
Maximum [Member] \| Share-based Payment Arrangement, 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
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