Note 1 - Summary of Significant Accounting Policies (Details) - Reconciliation of Earnings/(Loss) and the Weighted Average Number of Shares - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Computation of Basic Earnings Per Share:
Income from continuing operations										$ 774,405	$ 384,506	$ 288,454
Gain on sale of operating properties, net, net of tax										125,813	389	1,432
Net income attributable to noncontrolling interests										(6,028)	(11,879)	(5,072)
Discontinued operations attributable to noncontrolling interests											2,117	(7,930)
Preferred stock redemption costs										(5,816)
Preferred stock dividends										(57,084)	(58,294)	(58,294)
Income from continuing operations available to the common shareholders										831,290	316,839	218,590
Earnings attributable to participating securities										(4,134)	(1,749)	(1,360)
Income from continuing operations attributable to common shareholders										827,156	315,090	217,230
(Loss)/income from discontinued operations attributable to the Company										(75)	48,868	(40,603)
Net income attributable to the Company’s common shareholders for basic earnings per share										$ 827,081	$ 363,958	$ 176,627
Weighted average common shares outstanding – basic (in Shares)										411,319	409,088	407,631
Basic Earnings Per Share Attributable to the Company’s Common Shareholders:
Income from continuing operations (in Dollars per share)										$ 2.01	$ 0.77	$ 0.53
Income/(loss) from discontinued operations (in Dollars per share)											0.12	(0.10)
Net income (in Dollars per share)		$ 0.87	$ 0.15	$ 0.27	$ 0.72	$ 0.09	$ 0.44	$ 0.18	$ 0.18	$ 2.01	$ 0.89	$ 0.43
Computation of Diluted Earnings Per Share:
Income from continuing operations attributable to common shareholders										$ 827,156	$ 315,090	$ 217,230
(Loss)/income from discontinued operations attributable to the Company										(75)	48,868	(40,603)
Distributions on convertible units										192	529
Net income attributable to the Company’s common shareholders for diluted earnings per share										$ 827,273	$ 364,487	$ 176,627
Weighted average common shares outstanding – basic (in Shares)										411,319	409,088	407,631
Effect of dilutive securities(a):
Equity awards (in Shares)	[1]									1,414	1,227	983
Assumed conversion of convertible units (in Shares)	[1]									118	723
Shares for diluted earnings per common share (in Shares)										412,851	411,038	408,614
Diluted Earnings Per Share Attributable to the Company’s Common Shareholders:
Income from continuing operations (in Dollars per share)										$ 2.00	$ 0.77	$ 0.53
Income/(loss) from discontinued operations (in Dollars per share)											0.12	(0.10)
Net income (in Dollars per share)		$ 0.87	$ 0.15	$ 0.27	$ 0.71	$ 0.09	$ 0.44	$ 0.18	$ 0.18	$ 2.00	$ 0.89	$ 0.43

[1] The effect of the assumed conversion of certain convertible units had an anti-dilutive effect upon the calculation of Income from continuing operations per share. Accordingly, the impact of such conversions has not been included in the determination of diluted earnings per share calculations. Additionally, there were 5,300,680, 7,137,120 and 10,950,388, stock options that were not dilutive as of December 31, 2015, 2014 and 2013, respectively.