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Note 12 - Fair Value Measurements - Estimate of Fair Value Differs From Carrying Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Reported Value Measurement [Member]    
Notes payable [1] $ 4,409,500 $ 4,596,140
Reported Value Measurement [Member] | Mortgages [Member]    
Mortgages and construction loan payable, net [2] 477,974 882,787
Estimate of Fair Value Measurement [Member]    
Notes payable [1] 4,136,860 4,601,479
Estimate of Fair Value Measurement [Member] | Mortgages [Member]    
Mortgages and construction loan payable, net [2] $ 468,585 $ 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 September 30, 2018 and December 31, 2017, were $4.0 billion and $4.6 billion, respectively. The estimated fair value amounts classified as Level 3 as of September 30, 2018 and December 31, 2017, were $127.9 million and $1.9 million, respectively.
[2] The Company determined that its valuation of its mortgages and construction loan were classified within Level 3 of the fair value hierarchy.