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Note 12 - Fair Value Measurements (Details Textual) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Impairment of Real Estate |  | $ 30,500,000 | $ 31,300,000 |
Measurement Input, Cap Rate [Member] | Minimum [Member] |  |  |  |
Real Estate, Measurement Input |  | 0.085 |  |
Measurement Input, Cap Rate [Member] | Maximum [Member] |  |  |  |
Real Estate, Measurement Input |  | 0.09 |  |
Measurement Input, Discount Rate [Member] | Minimum [Member] |  |  |  |
Real Estate, Measurement Input |  | 0.095 |  |
Measurement Input, Discount Rate [Member] | Maximum [Member] |  |  |  |
Real Estate, Measurement Input |  | 0.1 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |
Notes Payable, Fair Value Disclosure | [1] | $ 4,338,371,000 |  | $ 4,601,479,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Notes Payable, Fair Value Disclosure |  | 4,300,000,000 |  | 4,600,000,000
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Notes Payable, Fair Value Disclosure |  | $ 0 |  | $ 1,900,000
[1] | The Company determined that the valuation of its Senior Unsecured Notes were classified within Level 2 of the fair value hierarchy and its 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, 2018 and December 31, 2017, were $4.3 billion and $4.6 billion, respectively. The estimated fair value amounts classified as Level 3 as of June 30, 2018 and December 31, 2017, were $0 and $1.9 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=109223946&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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- 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=6877327&loc=d3e13212-122682 + Details
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