Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions (Details) - Preferred Stock Issued (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2011	Aug. 30, 2010 Series H Preferred Stock [Member]		Mar. 31, 2012 Series I Preferred Stock [Member]		Jul. 31, 2012 Series J Preferred Stock [Member]		Dec. 31, 2012 Series K Preferred Stock [Member]
Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions (Details) - Preferred Stock Issued [Line Items]
Depositary Shares Issued		7,000,000		16,000,000		9,000,000		7,000,000
Net Proceeds (in Dollars)	$ 4,941	$ 169,200	[1]	$ 387,200	[2]	$ 217,800	[3]	$ 169,100	[4]
Offering/ Redemption Price (in Dollars per share)		$ 25.00		$ 25.00		$ 25.00		$ 25.00

[1] The net proceeds received from this offering were used to repay $150.0 million in mortgages payable and for general corporate purposes.

[2] The net proceeds received from this offering were used for general corporate purposes, including the reduction of borrowings outstanding under the Company's revolving credit facility and the redemption of shares of the Company's preferred stock.

[3] The net proceeds received from this offering were used for the redemption of all the outstanding depositary shares representing the Company's Class F preferred stock, which redemption occurred on August 15, 2012, as discussed below, with the remaining proceeds used towards the redemption of outstanding depositary shares representing the Company's Class G preferred stock, which redemption occurred on October 10, 2012, as discussed below, and general corporate purposes.

[4] The net proceeds received from this offering were used for general corporate purposes, including funding towards the repayment of maturing Senior Unsecured Notes.