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Net Income (Loss) Per Share Net Income (Loss) Per Share - Summary of Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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 [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations | $ (15,487) | $ 1,640 | $ (17,566) | $ (108,077) | $ (9,943) | $ (4,836) | $ (4,453) | $ (11,517) | $ (139,490) | $ (30,749) | $ (221,220)
Less: Preferred Stock cumulative dividends and deemed dividends |  |  |  |  |  |  |  |  | (12,373) | (642) | 0
Numerator for basic loss from continuing operations per common share |  |  |  |  |  |  |  |  | (151,863) | (31,391) | (221,220)
Numerator for diluted loss from continuing operations per common share |  |  |  |  |  |  |  |  | (151,863) | (31,391) | (221,220)
Income (loss) from discontinued operations, net of tax (Note 2) | $ 162,864 | $ 20,330 | $ (4,182) | $ (140,114) | $ (4,142) | $ (1,019) | $ (2,830) | $ (8,001) | 38,898 | (15,992) | (41,767)
Numerator for basic undistributed net loss per common share |  |  |  |  |  |  |  |  | (112,965) | (47,383) | (262,987)
Numerator for diluted undistributed net loss per common share |  |  |  |  |  |  |  |  | $ (112,965) | $ (47,383) | $ (262,987)
Weighted average common shares outstanding, basic and diluted (in shares) |  |  |  |  |  |  |  |  | 42,199 | 42,030 | 31,678
Basic loss from continuing operations per common share (in usd per share) | $ (0.44) | $ (0.04) | $ (0.49) | $ (2.64) | $ (0.25) | $ (0.12) | $ (0.11) | $ (0.27) | $ (3.60) | $ (0.75) | $ (6.98)
Basic income (loss) from discontinued operations per common share (in usd per share) |  |  |  |  |  |  |  |  | 0.92 | (0.38) | (1.32)
Basic net loss per common share (in usd per share) | 3.41 | 0.45 | (0.59) | (5.96) | (0.35) | (0.14) | (0.17) | (0.47) | (2.68) | (1.13) | (8.30)
Diluted loss from continuing operations per common share (in usd per share) | (0.44) | (0.04) | (0.49) | (2.64) | (0.25) | (0.12) | (0.11) | (0.27) | (3.60) | (0.75) | (6.98)
Diluted income (loss) from discontinued operations per common share (in usd per share) |  |  |  |  |  |  |  |  | 0.92 | (0.38) | (1.32)
Diluted net loss per common share (in usd per share) | $ 3.41 | $ 0.45 | $ (0.59) | $ (5.96) | $ (0.35) | $ (0.14) | $ (0.17) | $ (0.47) | (2.68) | (1.13) | (8.30)
Cash dividends declared per common share (in usd per share) |  |  |  |  |  |  |  |  | $ 0 | $ 0.21 | $ 0.28

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