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Note 1 - Interim Financial Statements - Reconciliation of Earnings (Loss) and the Weighted Average Number of Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Net income/(loss) available to the Company's common shareholders |  | $ 101,957 | $ (55,100) | $ 298,996 | $ 265,912
Earnings attributable to participating securities |  | (526) | (502) | (1,596) | (1,493)
Net income/(loss) available to the Company’s common shareholders for basic earnings/(loss) per share |  | 101,431 | (55,602) | 297,400 | 264,419
Distributions on convertible units |  | 24 |  | 43 |
Net income/(loss) available to the Company’s common shareholders for diluted earnings/(loss) per share |  | $ 101,455 | $ (55,602) | $ 297,443 | $ 264,419
Weighted average common shares outstanding – basic (in shares) |  | 423,688 | 420,073 | 423,574 | 416,829
Effect of dilutive securities (a): |  |  |  |  |
Equity awards (in shares) | [1] | 513 |  | 556 | 1,405
Assumed conversion of convertible units (in shares) | [1] | 110 |  | 63 |
Weighted average common shares outstanding – diluted (in shares) |  | 424,311 | 420,073 | 424,193 | 418,234
-Basic (in dollars per share) |  | $ 0.24 | $ (0.13) | $ 0.70 | $ 0.63
-Diluted (in dollars per share) |  | $ 0.24 | $ (0.13) | $ 0.70 | $ 0.63
[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/(loss) per share calculations. Additionally, there were 2,314,908 and 3,545,000 stock options that were not dilutive as of September 30, 2017 and 2016, respectively.

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