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Earnings per Common Share (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 $ / shares | Sep. 30, 2020 $ / shares | Jun. 30, 2020 $ / shares | Mar. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net loss from continuing operations | $ |  |  |  |  |  |  |  |  |  | $ (10,358) | $ (103,467) | $ (245,280)
Net income (loss) attributable to redeemable noncontrolling interests | $ |  |  |  |  |  |  |  |  |  | (344) | (1,126) | 8,837
Preferred stock dividend | $ |  |  |  |  |  |  |  |  |  | (37,981) | (32,134) | (25,593)
Net loss from continuing operations attributable to Synchronoss | $ |  |  |  |  |  |  |  |  |  | (48,683) | (136,727) | (262,036)
Income from discontinued operations, net of taxes | $ | [1] |  |  |  |  |  |  |  |  | 0 | 0 | 18,288
Net loss attributable to Synchronoss | $ |  |  |  |  |  |  |  |  |  | (48,683) | (136,727) | (243,748)
Income effect for interest on convertible debt, net of tax | $ |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net loss from continuing operations adjusted for the convertible debt | $ |  |  |  |  |  |  |  |  |  | $ (48,683) | $ (136,727) | $ (262,036)
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  | 41,950,000 | 40,694,000 | 40,277,000
Dilutive effect of: |  |  |  |  |  |  |  |  |  |  |  |
Shares from assumed conversion of convertible debt (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Shares from assumed conversion of preferred stock (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Options and unvested restricted shares (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Weighted average common shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  | 41,950,000 | 40,694,000 | 40,277,000
Basic EPS |  |  |  |  |  |  |  |  |  |  |  |
Net loss from Continuing Operations (in dollars per share) | $ / shares |  | $ (0.26) | $ (0.36) | $ (0.24) | $ (0.30) | $ (0.36) | $ (1.70) | $ (0.61) | $ (0.68) | $ (1.16) | $ (3.36) | $ (6.51)
Net income from Discontinued Operations (in dollars per share) | $ / shares | [1] |  |  |  |  |  |  |  |  | 0 | 0 | 0.46
Basic (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | (1.16) | (3.36) | (6.05)
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Net loss from Continuing Operations (in dollars per share) | $ / shares |  | $ (0.26) | $ (0.36) | $ (0.24) | $ (0.30) | $ (0.36) | $ (1.70) | $ (0.61) | $ (0.68) | (1.16) | (3.36) | (6.51)
Net income from Discontinued Operations (in dollars per share) | $ / shares | [1] |  |  |  |  |  |  |  |  | 0 | 0 | 0.46
Diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ (1.16) | $ (3.36) | $ (6.05)
Senior Notes | 2019 Notes |  |  |  |  |  |  |  |  |  |  |  |
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  |  |  | 0.0188072 |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive stock options excluded (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Restricted stock awards |  |  |  |  |  |  |  |  |  |  |  |
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive stock options excluded (in shares) |  |  |  |  |  |  |  |  |  | 1,510,000 | 3,375,000 | 2,700,000
Convertible debt securities |  |  |  |  |  |  |  |  |  |  |  |
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive stock options excluded (in shares) |  |  |  |  |  |  |  |  |  | 0 | 1,288,292 | 3,972,939
Preferred stock |  |  |  |  |  |  |  |  |  |  |  |
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive stock options excluded (in shares) |  |  |  |  |  |  |  |  |  | 13,202,267 | 11,383,105 | 9,312,528
Preferred stock, conversion ratio |  |  |  |  |  |  |  |  |  | 0.0555556 |  |
[1] | See Note 4. Acquisitions and Divestitures for transactions classified as discontinued operations

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