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Note 12 - Fair Value Measurements (Details) - Financial Instruments: Estimate of Fair Value Differs from Carrying Amounts (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financial Instruments: Estimate of Fair Value Differs from Carrying Amounts [Abstract]    
Marketable securities (1) $ 63,312 [1] $ 62,766 [1]
Marketable securities (1) 63,201 [1] 62,824 [1]
Notes payable (2) 3,305,065 [2] 3,186,047 [2]
Notes payable (2) 3,443,546 [2] 3,333,614 [2]
Mortgages payable (3) 1,075,281 [3] 1,035,354 [3]
Mortgages payable (3) $ 1,124,807 [3] $ 1,083,801 [3]
[1] As of March 31, 2014 and December 31, 2013, the Company determined that $60.5 million and $59.7 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $2.7 million and $3.1 million, respectively, were classified within Level 3 of the fair value hierarchy.
[2] The Company determined that its valuation of Notes payable was classified within Level 2 of the fair value hierarchy.
[3] The Company determined that its valuation of Mortgages payable was classified within Level 3 of the fair value hierarchy.