Note 13 - Supplemental Schedule of Non-cash Investing / Financing Activities (Details) - Non-Cash Investing and Financing Activities (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Note 13 - Supplemental Schedule of Non-cash Investing / Financing Activities (Details) - Non-Cash Investing and Financing Activities [Line Items]
Acquisition of real estate interests by assumption of mortgage debt	$ 20,800us-gaap_LiabilitiesAssumed1	$ 89,718us-gaap_LiabilitiesAssumed1
Acquisition of real estate interests by issuance of redeemable units/partnership interest		4,943
Acquisition of real estate interests through proceeds held in escrow	31,738
Proceeds held in escrow through sale of real estate interests	13,855	14,885
Declaration of dividends paid in succeeding period	111,357	104,670	111,143
Consolidation of Joint Ventures:
Increase in real estate and other assets	897,476	30,912
Increase in mortgages payable	637,976	23,269
Restricted Stock [Member] \| Non-cash [Member]
Note 13 - Supplemental Schedule of Non-cash Investing / Financing Activities (Details) - Non-Cash Investing and Financing Activities [Line Items]
Surrender of restricted common stock	(5,172)	(2,839)
Restricted Stock [Member]
Note 13 - Supplemental Schedule of Non-cash Investing / Financing Activities (Details) - Non-Cash Investing and Financing Activities [Line Items]
Issuance of restricted common stock	$ 2,980	$ 11,451

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

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-Publisher FASB

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-SubTopic 210

-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7

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Amount of escrow deposit disbursements related to property acquisition in noncash investing or financing transactions.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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Escrow deposits related to property sales in noncash investing and financing activities.

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The fair value of liabilities assumed in noncash investing or financing activities.

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The amount of assets that an Entity acquires in a noncash (or part noncash) acquisition that are not presented as a separate disclosure or not otherwise listed in the existing taxonomy. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period.

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The fair value of stock issued in noncash financing activities.

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