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Earnings Per Share (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 12, 2014 | Dec. 31, 2017 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Jun. 30, 2017 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive stock options excluded (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,648,000 |  | 1,310,000 |  | 556,000 |
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss from continuing operations |  |  |  |  |  | $ (38,334) | $ (10,092) | $ (14,293) | $ (31,150) | $ (25,118) | $ (9,998) | $ (16,213) | $ 13,547 | $ (194,224) |  | $ (93,869) |  | $ (37,782) |
Net (loss) income attributable to noncontrolling interests |  |  |  |  |  | (5,709) | (3,347) | (3,140) | (3,007) | (628) |  |  |  | (9,291) |  | (15,203) |  | (628) |
Net (loss) income from continuing operations attributable to Synchronoss |  |  |  |  |  |  |  |  |  |  |  |  |  | (184,933) |  | (78,666) |  | (37,154) |
Net income from discontinued operations, net of taxes |  |  |  |  |  | 63,454 | 9,307 | 18,985 | (1,186) | 9,314 | 1,140 | 23,622 | 6,191 | 75,495 |  | 90,560 |  | 40,267 |
Net (loss) income attributable to Synchronoss |  | $ 10,915 | $ (35,088) | $ (26,568) | $ (58,697) | $ 30,829 | $ 2,562 | $ 7,832 | $ (29,329) | $ (15,176) | $ (8,858) | $ 7,409 | $ 19,738 | (109,438) |  | 11,894 |  | 3,113 |
Income effect for interest on convertible debt, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Numerator for diluted EPS- Income to common stockholders after assumed conversions |  |  |  |  |  |  |  |  |  |  |  |  |  | (184,933) |  | (78,666) |  | (37,154) |
Net income attributable to Synchronoss, adjusted for the convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (109,438) |  | $ 11,894 |  | $ 3,113 |
Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding - basic (in shares) | shares |  |  |  |  |  | 43,814,000 | 43,560,000 | 43,450,000 | 43,423,000 | 42,817,000 | 42,491,000 | 41,870,000 | 41,626,000 | 44,668,921 | [1] | 43,551,409 | [1] | 42,284,393 | [1]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares from assumed conversion of convertible debt (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Options and unvested restricted shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Weighted average common shares outstanding - diluted (in shares) | shares |  |  |  |  |  | 43,814,000 | 43,560,000 | 43,450,000 | 43,423,000 | 42,817,000 | 42,491,000 | 41,870,000 | 47,080,000 | 44,668,921 | [1] | 43,551,409 | [1] | 42,284,393 | [1]
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic, Continuing operations (in dollars per share) | $ / shares |  | $ (1.75) | $ (0.98) | $ (0.44) | $ (0.96) | $ (0.74) | $ (0.15) | $ (0.25) | $ (0.66) | $ (0.57) | $ (0.24) | $ (0.39) | $ 0.33 | $ (4.14) | [1] | $ (1.81) | [1] | $ (0.88) | [1]
Basic, Discontinued operations (in dollars per share) | $ / shares |  | 1.99 | 0.20 | (0.16) | (0.37) | 1.45 | 0.21 | 0.44 | (0.03) | 0.22 | 0.03 | 0.56 | 0.15 | 1.69 | [1] | 2.08 | [1] | 0.95 | [1]
Basic (in dollars per share) | $ / shares |  | 0.24 | (0.78) | (0.60) | (1.33) | 0.71 | 0.06 | 0.19 | (0.69) | (0.35) | (0.21) | 0.17 | 0.48 | (2.45) | [1] | 0.27 | [1] | 0.07 | [1]
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted, Continuing operations (in dollars per share) | $ / shares |  | (1.75) | (0.98) | (0.44) | (0.96) | (0.74) | (0.15) | (0.25) | (0.66) | (0.57) | (0.24) | (0.39) | 0.30 | (4.14) | [1] | (1.81) | [1] | (0.88) | [1]
Diluted, Discontinued operations (in dollars per share) | $ / shares |  | 1.99 | 0.20 | (0.16) | (0.37) | 1.45 | 0.21 | 0.44 | (0.03) | 0.22 | 0.03 | 0.56 | 0.13 | 1.69 | [1] | 2.08 | [1] | 0.95 | [1]
Diluted (in dollars per share) | $ / shares |  | $ 0.24 | $ (0.78) | $ (0.60) | $ (1.33) | $ 0.71 | $ 0.06 | $ 0.19 | $ (0.69) | $ (0.35) | $ (0.21) | $ 0.17 | $ 0.43 | $ (2.45) | [1] | $ 0.27 | [1] | $ 0.07 | [1]
2019 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate | 0.0188072 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive stock options excluded (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,325,646 |  |  |  |  |
[1] | See Note 3 - Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements.

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