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Note 12 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Impairment of Real Estate |  | $ 4,200 | $ 7,600 |
Estimate of Fair Value Measurement [Member] |  |  |  |
Notes Payable, Fair Value Disclosure | [1] | 4,302,177 |  | $ 4,126,450
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Notes Payable, Fair Value Disclosure |  | 4,200,000 |  | 4,000,000
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Notes Payable, Fair Value Disclosure |  | $ 97,900 |  | $ 97,600
[1] | The Company determined that the valuation of its Senior Unsecured Notes were classified within Level 2 of the fair value hierarchy and its Credit Facility was classified within Level 3 of the fair value hierarchy. The estimated fair value amounts classified as Level 2 as of March 31, 2019 and December 31, 2018, were $4.2 billion and $4.0 billion, respectively. The estimated fair value amounts classified as Level 3 as of March 31, 2019 and December 31, 2018, were $97.9 million and $97.6 million, respectively.

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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