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Deferred Revenue and Performance Obligations (Deferred Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Jan. 01, 2017
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | $ 299,887 | $ 290,100
Contract With Customer Liability [Roll Forward] |  |
Balance, beginning of period December 31, 2017 (As Adjusted). | 299,887 |
Deferral of revenue | 160,881 |
Recognition of deferred revenue | (191,995) |
Balance, end of period | 268,773 |
Operating segments | Enterprise Software |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | 277,198 |
Contract With Customer Liability [Roll Forward] |  |
Balance, beginning of period December 31, 2017 (As Adjusted). | 277,198 |
Balance, end of period | 249,104 |
Operating segments | Appraisal and Tax |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | 20,387 |
Contract With Customer Liability [Roll Forward] |  |
Balance, beginning of period December 31, 2017 (As Adjusted). | 20,387 |
Balance, end of period | 17,497 |
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | 2,302 |
Contract With Customer Liability [Roll Forward] |  |
Balance, beginning of period December 31, 2017 (As Adjusted). | 2,302 |
Balance, end of period | $ 2,172 |

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