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Earnings Per Share - Computation Of Basic And Diluted EPS (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (13,747) | $ 27,121 | $ 17,784 | $ (2,560) | $ 50,580 | $ 2,290 | $ (6,403) | $ (16,415) | $ 28,598 | $ 30,052 | $ (81,445)
Less: Undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  | (273) | (356) | 0
Undistributed earnings (loss) allocated to common shares |  |  |  |  |  |  |  |  | $ 28,325 | $ 29,696 | $ (81,445)
Weighted average number of shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 146,702 | 145,295 | 111,612
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings (loss) allocated to common shares |  |  |  |  |  |  |  |  | $ 28,325 | $ 29,696 | $ (81,445)
Share-based awards other than participating securities |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Share-based awards other than participating securities (in shares) |  |  |  |  |  |  |  |  | 128 | 5 | 0
Undistributed earnings reallocated to participating securities |  |  |  |  |  |  |  |  | $ 1 | $ 0 | $ 0
Net income (loss) |  |  |  |  |  |  |  |  | $ 28,326 | $ 29,696 | $ (81,445)
Weighted average number of shares outstanding, diluted |  |  |  |  |  |  |  |  | 146,830 | 145,300 | 111,612

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