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Earnings (Loss) Per Common Share (EPS) - Basic EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |  |  |
Net income (loss) | $ 11,967 | $ 4,916 | $ 10,958 | $ (3,009) | $ (19,058) | $ (3,154) | $ 27,841 | $ (25,221)
Average common shares outstanding (in shares) | 56,302 |  |  | 55,505 |  |  | 56,033 | 55,386
Basic EPS (in dollars per share) | $ 0.21 |  |  | $ (0.05) |  |  | $ 0.50 | $ (0.46)

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