Note 12 - Fair Value Measurements (Details) - Financial Instruments: Estimate of Fair Value Differs from Carrying Amounts (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financial Instruments: Estimate of Fair Value Differs from Carrying Amounts [Abstract]
Marketable securities (1)	$ 77,123	[1]	$ 62,766	[1]
Marketable securities (1)	77,253	[1]	62,824	[1]
Notes payable (2)	3,353,458	[2]	3,186,047	[2]
Notes payable (2)	3,513,711	[2]	3,333,614	[2]
Mortgages payable (3)	1,343,859	[3]	1,035,354	[3]
Mortgages payable (3)	$ 1,399,124	[3]	$ 1,083,801	[3]

[1] As of September 30, 2014 and December 31, 2013, the Company determined that $74.5 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 $2.8 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.