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Note 10 - Fair Value Measurements - Estimate of Fair Value Differs from Carrying Amounts (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Reported Value Measurement [Member] | Marketable Securities [Member]    
Marketable securities (1) [1] $ 7,006 $ 7,565
Reported Value Measurement [Member] | Mortgages [Member]    
Long-term Debt, Fair Value [2] 1,460,188 1,614,982
Reported Value Measurement [Member]    
Notes payable (2) [3] 3,728,629 3,761,328
Estimate of Fair Value Measurement [Member] | Marketable Securities [Member]    
Marketable securities (1) [1] 7,060 7,564
Estimate of Fair Value Measurement [Member] | Mortgages [Member]    
Long-term Debt, Fair Value [2] 1,448,438 1,629,760
Estimate of Fair Value Measurement [Member]    
Notes payable (2) [3] $ 3,886,518 $ 3,820,205
[1] As of June 30, 2016 and December 31, 2015, the Company determined that $5.4 million and $5.9 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $1.7 million and $1.7 million, respectively, were classified within Level 3 of the fair value hierarchy.
[2] The Company determined that its valuation of Mortgages payable was classified within Level 3 of the fair value hierarchy.
[3] The Company determined that its valuation of Notes payable was classified within Level 2 of the fair value hierarchy.