Note 23 - Supplemental Financial Information (Details) - Quarterly Results of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Results of Operations [Abstract]
Revenues from rental properties (1) (in Dollars)	$ 238,055	[1]	$ 226,536	[1]	$ 225,207	[1]	$ 220,558	[1]	$ 216,895	[1]	$ 208,130	[1]	$ 208,648	[1]	$ 203,208	[1]	$ 910,356	$ 836,881	$ 779,156
Net income attributable to the Company (in Dollars)	$ 61,609		$ 55,763		$ 51,139		$ 67,770		$ 88,382		$ 54,941		$ 69,112		$ 53,638		$ 236,281	$ 266,073	$ 169,051
Net income per common share:
Basic	$ 0.11		$ 0.10		$ 0.09		$ 0.13		$ 0.14		$ 0.07		$ 0.12		$ 0.09		$ 0.43	$ 0.42	$ 0.27
Diluted	$ 0.11		$ 0.10		$ 0.09		$ 0.13		$ 0.14		$ 0.07		$ 0.12		$ 0.09		$ 0.43	$ 0.42	$ 0.27

[1] All periods have been adjusted to reflect the impact of operating properties sold during 2013 and 2012 and properties classified as held-for-sale as of December 31, 2013, which are reflected in the caption Discontinued operations on the accompanying Consolidated Statements of Income.