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Note 12 - Fair Value Measurements - Estimate of Fair Value Differs From Carrying Amounts (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Reported Value Measurement [Member] |  |  |
Notes payable | [1] | $ 4,597,967 | $ 4,596,140
Reported Value Measurement [Member] | Mortgages [Member] |  |  |
Mortgages payable | [2] | 499,355 | 882,787
Estimate of Fair Value Measurement [Member] |  |  |
Notes payable | [1] | 4,418,144 | 4,601,479
Estimate of Fair Value Measurement [Member] | Mortgages [Member] |  |  |
Mortgages payable | [2] | $ 494,366 | $ 881,427
[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, 2018 and December 31, 2017, were $4.4 billion and $4.6 billion, respectively. The estimated fair value amounts classified as Level 3 as of March 31, 2018 and December 31, 2017, were $2.2 million and $1.9 million, respectively.
[2] | The Company determined that its valuation of Mortgages payable, net was classified within Level 3 of the fair value hierarchy.

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
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