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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 | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 15,378 | $ (3,009) | $ (19,058) | $ (3,154) | $ (4,205) | $ (3,398) | $ 6,859 | $ 6,195 | $ (9,843) | $ 5,451 | $ 42,017
Average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 55,434 | 55,075 | 52,268
Basic EPS (in dollars per share) | $ 0.28 | $ (0.05) | $ (0.34) | $ (0.06) | $ (0.08) | $ (0.06) | $ 0.12 | $ 0.11 | $ (0.18) | $ 0.10 | $ 0.80

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