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Restatement of Previously Issued Consolidated Financial Statements Restated Statements Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity | $ 463,587 | $ 529,797 | $ 502,896 | $ 485,892 | $ 498,592 | $ 505,329 | $ 463,464
Common stock, shares issued (in shares) | 52,024 | 50,388 |  |  |  |  |
As Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  | $ 657,115 | 631,172 | 605,754 | 627,716 |  | 529,107
Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | (65,643)
Revenue - Hosting, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  | (86,707) | (64,377) | (57,934) | (44,941) |  | (20,152)
Acquisitions & Divestiture, before income tax effect |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  | (38,714) | (42,712) | (46,366) |  |
Acquisitions & Divestiture, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  | (27,560) |  |  |  |  | (60,238)
Revenue - Evidence of Arrangement and Other Revenue, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  | (42,163) | (68,151) | (60,305) | (75,714) |  | (5,960)
Capitalized Software and Other, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  | (25,741) | (9,237) | (3,680) | 734 |  | (3,901)
Income tax adjustments | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  | 54,853 | $ 52,203 | $ 44,769 | $ 37,163 |  | 24,608
Common Stock |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity | $ 5 | $ 5 |  |  |  | $ 4 | $ 4
Common stock, shares issued (in shares) | 52,028 | 50,388 |  |  |  | 48,287 | 46,620
Common Stock | As Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | $ 4
Common stock, shares issued (in shares) |  |  |  |  |  |  | 46,444
Common Stock | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  | 176
Common Stock | Capitalized Software and Other, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  | 176
Treasury Stock |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity | $ (105,584) | $ (106,631) |  |  |  | $ (68,327) | $ (68,327)
Common stock, shares issued (in shares) | (5,060) | (5,096) |  |  |  | (3,892) | (3,892)
Treasury Stock | As Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | $ (66,336)
Common stock, shares issued (in shares) |  |  |  |  |  |  | (3,733)
Treasury Stock | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | $ (1,991)
Common stock, shares issued (in shares) |  |  |  |  |  |  | (159)
Treasury Stock | Capitalized Software and Other, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | $ (1,991)
Common stock, shares issued (in shares) |  |  |  |  |  |  | (159)
Additional Paid-In Capital |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity | $ 597,553 | $ 571,153 |  |  |  | $ 514,964 | $ 457,148
Additional Paid-In Capital | As Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | 454,740
Additional Paid-In Capital | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | 2,408
Additional Paid-In Capital | Capitalized Software and Other, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | 2,408
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity | (23,373) | (42,350) |  |  |  | (37,514) | (18,454)
Accumulated Other Comprehensive Income (Loss) | As Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | (20,014)
Accumulated Other Comprehensive Income (Loss) | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | 1,560
Accumulated Other Comprehensive Income (Loss) | Acquisitions & Divestiture, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | 240
Accumulated Other Comprehensive Income (Loss) | Capitalized Software and Other, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | 281
Accumulated Other Comprehensive Income (Loss) | Income tax adjustments | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | 1,039
Retained Earnings |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity | $ (5,014) | $ 107,620 |  |  |  | $ 96,202 | 93,093
Retained Earnings | As Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | 160,713
Retained Earnings | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | (67,620)
Retained Earnings | Revenue - Hosting, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | (20,152)
Retained Earnings | Acquisitions & Divestiture, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | (60,478)
Retained Earnings | Revenue - Evidence of Arrangement and Other Revenue, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | (5,960)
Retained Earnings | Capitalized Software and Other, before income tax effect | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | (4,599)
Retained Earnings | Income tax adjustments | Adjustments |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Total stockholders' equity |  |  |  |  |  |  | $ 23,569

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