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Note 23 - Earnings Per Share - Reconciliation of Earnings/(Loss) and the Weighted Average Number of Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income from continuing operations                 $ 346,133 $ 299,353 $ 774,405
Gain on sale of operating properties, net, net of tax                 93,538 86,785 125,813
Net income attributable to noncontrolling interests                 (13,596) (7,288) (6,028)
Preferred stock redemption charge                 (7,014) (5,816)
Preferred dividends                 (46,600) (46,220) (57,084)
Earnings attributable to participating securities                 (2,132) (2,018) (4,134)
Income from continuing operations available to the Company’s common shareholders                 370,329 330,612 827,156
Loss from discontinued operations available to the Company’s common shareholders                 (75)
Net income available to the Company’s common shareholders for basic earnings per share                 370,329 330,612 827,081
Distributions on convertible units                 192
Net income available to the Company’s common shareholders for diluted earnings per share                 $ 370,329 $ 330,612 $ 827,273
-Basic (in shares)                 423,614 418,402 411,319
Effect of dilutive securities (1):                      
Equity awards (in shares) [1]                 405 1,307 1,414
Assumed conversion of convertible units (in shares) [1]                 118
Weighted-average common shares outstanding – diluted (in shares) [1]                 424,019 419,709 412,851
Income from continuing operations (in dollars per share)                 $ 0.87 $ 0.79 $ 2.01
-Basic (in dollars per share) $ 0.17 $ 0.24 $ 0.31 $ 0.15 $ 0.16 $ (0.13) $ 0.46 $ 0.31 0.87 0.79 2.01
Income from continuing operations (in dollars per share)                 0.87 0.79 2
Net income available to the Company’s common shareholders (in dollars per share) $ 0.17 $ 0.24 $ 0.31 $ 0.15 $ 0.16 $ (0.13) $ 0.46 $ 0.31 $ 0.87 $ 0.79 $ 2
[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 3,082,106, 3,490,400 and 5,300,680 stock options that were not dilutive as of December 31, 2017, 2016 and 2015, respectively.