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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock | Treasury Stock Treasury Stock | Treasury Stock Additional Paid-In Capital | Common Stock | Common Stock Common Stock | Common Stock Additional Paid-In Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (As Previously Reported) at Dec. 31, 2014 | $ 529,107 | $ 4 | $ (66,336) | $ 454,740 | $ (20,014) | $ 160,713 |  |  |  |  |  |
Balance (Adjustments) | (65,643) |  | (1,991) | 2,408 | 1,560 | (67,620) |  |  |  |  |  |
Balance at Dec. 31, 2014 | 463,464 | $ 4 | $ (68,327) | 457,148 | (18,454) | 93,093 |  |  |  |  |  |
Balance (in shares) (As Previously Reported) at Dec. 31, 2014 |  | 46,444 | (3,733) |  |  |  |  |  |  |  |  |
Balance (in shares) (Adjustments) |  | 176 | (159) |  |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2014 |  | 46,620 | (3,892) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation | 30,780 |  |  | 30,780 |  |  |  |  |  |  |  |
Issuance of restricted stock | 0 |  |  | 0 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  | (734) |  |  |  |  |  |  |  |  |  |
Issuance of common stock on exercise of options | 19,936 |  |  | 19,936 |  |  |  |  |  |  |  |
Issuance of common stock on exercise of options (in shares) |  | 879 |  |  |  |  |  |  |  |  |  |
ESPP compensation | 624 |  |  | 624 |  |  |  |  |  |  |  |
Sale of treasury stock in connection with an employee stock purchase plan | 1,902 |  |  | 1,902 |  |  |  |  |  |  |  |
Other | 0 |  |  | 4 |  |  |  |  |  |  |  |
Sale of treasury stock in connection with an employee stock purchase plan |  | 54 |  |  |  |  |  |  |  |  |  |
Adjustments to redemption value of noncontrolling interest | (628) |  |  | (628) |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | As Previously Reported | 40,630 |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | 3,113 |  |  |  |  | 3,113 |  |  |  |  |  |
Total other comprehensive income (loss) | As Previously Reported | (18,670) |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) | (19,060) |  |  |  | (19,060) |  |  |  |  |  |  |
Tax benefit from stock option exercise | 5,198 |  |  | 5,198 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2015 | 505,329 | $ 4 | $ (68,327) | 514,964 | (37,514) | 96,202 |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2015 |  | 48,287 | (3,892) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of adjustment to retained earnings (ASU Adoption) | 234 |  |  | 710 |  | (476) |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | As Previously Reported | (7,954) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | (29,329) |  |  |  |  |  |  |  |  |  |  |
Balance (As Previously Reported) at Mar. 31, 2016 | 627,716 |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2016 | 498,592 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2015 | 505,329 | $ 4 | $ (68,327) | 514,964 | (37,514) | 96,202 |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2015 |  | 48,287 | (3,892) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation | 33,361 |  |  | 33,361 |  |  |  |  |  |  |  |
Issuance of restricted stock | 0 |  |  | 0 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  | (585) |  |  |  |  |  |  |  |  |  |
Issuance of common stock on exercise of options | 13,913 | $ 1 |  | 13,912 |  |  |  |  |  |  |  |
Issuance of common stock on exercise of options (in shares) |  | 608 |  |  |  |  |  |  |  |  |  |
ESPP compensation | 817 |  |  | 817 |  |  |  |  |  |  |  |
Issuance of common stock related to acquisition | 22,000 |  |  | 22,000 |  |  |  |  |  |  |  |
Issuance of common stock related to acquisition (in shares) |  | 840 |  |  |  |  |  |  |  |  |  |
Issuance of common stock to subsidiary (in shares) |  | 20 |  |  |  |  |  |  |  |  |  |
Sale of treasury stock in connection with an employee stock purchase plan | (40,025) |  | $ (40,025) |  |  |  |  |  |  |  |  |
Repurchase of treasury stock (in shares) |  |  | (1,262) |  |  |  |  |  |  |  |  |
Sale of treasury stock in connection with an employee stock purchase plan |  |  |  |  |  |  | $ 1,228 | $ 1,721 | $ (493) | $ 955 |  | $ 955
Other | 130 |  |  | 130 |  |  |  |  |  |  |  |
Sale of treasury stock in connection with an employee stock purchase plan |  |  |  |  |  |  |  | 58 |  |  |  |
Adjustments to redemption value of noncontrolling interest | (15,203) |  |  | (15,203) |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | As Previously Reported | 19,588 |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | 11,894 |  |  |  |  | 11,894 |  |  |  |  |  |
Total other comprehensive income (loss) | As Previously Reported | (4,569) |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) | (4,836) |  |  |  | (4,836) |  |  |  |  |  |  |
Balance (As Previously Reported) at Dec. 31, 2016 | 657,115 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2016 | $ 529,797 | $ 5 | $ (106,631) | 571,153 | (42,350) | 107,620 |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2016 | 50,388 | 50,388 | (5,096) |  |  |  |  |  |  |  |  |
Balance (As Previously Reported) at Mar. 31, 2016 | $ 627,716 |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2016 | 498,592 |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | As Previously Reported | (4,439) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | 7,832 |  |  |  |  |  |  |  |  |  |  |
Balance (As Previously Reported) at Jun. 30, 2016 | 605,754 |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2016 | 485,892 |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | As Previously Reported | 7,676 |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | 2,562 |  |  |  |  |  |  |  |  |  |  |
Balance (As Previously Reported) at Sep. 30, 2016 | 631,172 |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2016 | 502,896 |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | As Previously Reported | 24,305 |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | 30,829 |  |  |  |  |  |  |  |  |  |  |
Balance (As Previously Reported) at Dec. 31, 2016 | 657,115 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2016 | $ 529,797 | $ 5 | $ (106,631) | 571,153 | (42,350) | 107,620 |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2016 | 50,388 | 50,388 | (5,096) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of adjustment to retained earnings (ASU Adoption) | $ (3,196) |  |  |  |  | (3,196) |  |  |  |  |  |
Stock based compensation | 28,446 |  |  | 28,446 |  |  |  |  |  |  |  |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  | (1,565) |  |  |  |  |  |  |  |  |  |
Issuance of common stock on exercise of options | $ 2,460 |  |  | 2,460 |  |  |  |  |  |  |  |
Issuance of common stock on exercise of options (in shares) | 104 | 104 |  |  |  |  |  |  |  |  |  |
ESPP compensation | $ 495 |  |  | 495 |  |  |  |  |  |  |  |
Issuance of common stock related to acquisition | 4,701 |  |  | 4,701 |  |  |  |  |  |  |  |
Sale of treasury stock in connection with an employee stock purchase plan | 1,047 |  | $ 1,047 |  |  |  |  |  |  |  |  |
Shares withheld for taxes in connection with issuance of restricted stock |  | 29 |  |  |  |  |  |  |  |  |  |
Shares withheld for taxes in connection with issuance of restricted stock | (442) |  |  | (442) |  |  |  |  |  |  |  |
Other | 31 |  |  | 31 |  |  |  |  |  |  |  |
Sale of treasury stock in connection with an employee stock purchase plan |  |  | 36 |  |  |  |  |  |  |  | 48 |
Adjustments to redemption value of noncontrolling interest | (9,291) |  |  | (9,291) |  |  |  |  |  |  |  |
Net income (loss) attributable to Synchronoss (2) | (109,438) |  |  |  |  | (109,438) |  |  |  |  |  |
Total other comprehensive income (loss) | 18,977 |  |  |  | 18,977 |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 463,587 | $ 5 | $ (105,584) | $ 597,553 | $ (23,373) | $ (5,014) |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2017 | 52,024 | 52,028 | (5,060) |  |  |  |  |  |  |  |  |

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