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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
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net income available to the Company's common shareholders |  |  |  |  |  |  |  |  |  | $ 439,604 | $ 372,461 | $ 332,630
Change in estimated redemption value of redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | (7,521) |  |
Earnings attributable to participating securities |  |  |  |  |  |  |  |  |  | (2,375) | (2,132) | (2,018)
Net income available to the Company’s common shareholders for basic earnings per share |  |  |  |  |  |  |  |  |  | 429,708 | 370,329 | 330,612
Distributions on convertible units |  |  |  |  |  |  |  |  |  | 99 |  |
Net income available to the Company’s common shareholders for diluted earnings per share |  |  |  |  |  |  |  |  |  | $ 429,807 | $ 370,329 | $ 330,612
Weighted average common shares outstanding – basic (in shares) |  |  |  |  |  |  |  |  |  | 420,641 | 423,614 | 418,402
Effect of dilutive securities (1): |  |  |  |  |  |  |  |  |  |  |  |
Equity awards (in shares) | [1] |  |  |  |  |  |  |  |  | 628 | 405 | 1,307
Assumed conversion of convertible units (in shares) | [1] |  |  |  |  |  |  |  |  | 110 |  |
Weighted average common shares outstanding – diluted (in shares) | [1] |  |  |  |  |  |  |  |  | 421,379 | 424,019 | 419,709
Basic earnings per share (in dollars per share) |  | $ 0.17 | $ 0.19 | $ 0.36 | $ 0.30 | $ 0.17 | $ 0.24 | $ 0.31 | $ 0.15 | $ 1.02 | $ 0.87 | $ 0.79
Diluted earnings per share (in dollars per share) |  | $ 0.17 | $ 0.19 | $ 0.36 | $ 0.30 | $ 0.17 | $ 0.24 | $ 0.31 | $ 0.15 | $ 1.02 | $ 0.87 | $ 0.79
[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 1.3 million, 3.1 million and 3.5 million stock options that were not dilutive as of December 31, 2018, 2017 and 2016, respectively.

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