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Earnings Per Share - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Basic |  |  |  |  |  |  |  |  |  |
Net Income (Loss) | $ 70,596 | $ (107,987) | $ (176,296) | $ 6,278 | $ (237,963) | $ (311,253) | $ (284,283) | $ (549,216) | $ (213,687) | $ (542,938)
Less: Net income (loss) allocable to participating RSUs | 0 |  |  | 0 |  |  |  |  | 0 | 0
Net income (loss) available for basic common shares | $ 70,596 |  |  | $ 6,278 |  |  |  |  | $ (213,687) | $ (542,938)
Weighted average number of common shares (in shares) | 346,698 |  |  | 345,285 |  |  |  |  | 346,210 | 344,774
Basic net income (loss) per common share (USD per share) | $ 0.20 |  | $ (0.51) | $ 0.02 | $ (0.69) |  | $ (0.82) | $ (1.59) | $ (0.62) | $ (1.57)
Diluted |  |  |  |  |  |  |  |  |  |
Net Income (Loss) | $ 70,596 | $ (107,987) | $ (176,296) | $ 6,278 | $ (237,963) | $ (311,253) | $ (284,283) | $ (549,216) | $ (213,687) | $ (542,938)
Less: Net income (loss) allocable to participating RSUs | 0 |  |  | 0 |  |  |  |  | 0 | 0
Net income (loss) available for diluted common shares | $ 70,596 |  |  | $ 6,278 |  |  |  |  | $ (213,687) | $ (542,938)
Weighted average number of common shares (in shares) | 346,698 |  |  | 345,285 |  |  |  |  | 346,210 | 344,774
Weighted average number of common equivalent shares from: |  |  |  |  |  |  |  |  |  |
Dilutive stock options and non-participating RSUs (in shares) | 1,789 |  |  | 387 |  |  |  |  | 0 | 0
Weighted average number of common and potential common shares (in shares) | 348,487 |  |  | 345,672 |  |  |  |  | 346,210 | 344,774
Diluted net income (loss) per common share (USD per share) | $ 0.20 |  | $ (0.51) | $ 0.02 | $ (0.69) |  | $ (0.82) | $ (1.59) | $ (0.62) | $ (1.57)
Nonqualified stock options and non-participating RSUs excluded from the calculation of diluted net income per common share (in shares) | 25,300 |  |  | 22,600 |  |  |  |  |  |

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