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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

X

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(31))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
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