Note 6 - Impairments (Details Textual) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
		Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Asset Impairment Charges, Total	[1],[2]		$ 79,207	$ 67,331	$ 93,266
Assets Impairment Charges, Income Tax Benefit					21,100
Asset Impairment Charges, Attributable to Noncontrolling Interest					400
Impairment of Real Estate			79,200	67,300
Property Carrying Values [Member]
Asset Impairment Charges, Total					93,300
Assets Impairment Charges, Income Tax Benefit					21,100
Asset Impairment Charges, Attributable to Noncontrolling Interest					400
Equity Method Investments [Member]
Impairment of Real Estate			$ 6,900	4,800	$ 15,000
Properties Marketed for Sale [Member]
Asset Impairment Charges, Total		$ 41,000
Impaired Due to Unfavorable Local Market Conditions [Member]
Asset Impairment Charges, Total				$ 16,200

[1] During 2016, the Company recognized aggregate impairment charges of $93.3 million, before an income tax benefit of $21.1 million and noncontrolling interests of $0.4 million, primarily related to sale of certain operating properties and certain properties maintained in the Company's TRS for which the hold period was re-evaluated in connection with the Merger (see Footnote 21 of the Notes to Consolidated Financial Statements for additional disclosure) and adjustments to property carrying values in connection with the Company's efforts to market certain properties and management's assessment as to the likelihood and timing of such potential transactions and the anticipated hold period for such properties.

[2] See Footnote 15 of the Notes to Consolidated Financial Statements for additional disclosure on fair value