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Note 12 - Fair Value Measurements (Details Textual) - Estimate of Fair Value Measurement [Member] - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Notes Payable, Fair Value Disclosure | [1] | $ 5,443,088 | $ 5,486,953
Fair Value, Inputs, Level 2 [Member] |  |  |
Notes Payable, Fair Value Disclosure |  | $ 5,400,000 | $ 5,500,000
[1] | The Company determined that the valuation of its Senior Unsecured Notes were classified within Level 2 of the fair value hierarchy and its unsecured revolving credit facility was classified within Level 3 of the fair value hierarchy. The estimated fair value amounts classified as Level 2, as of June 30, 2021 and December 31, 2020, were $5.4 billion and $5.5 billion, respectively.

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- Definition Fair value portion of notes payable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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