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Fair Value Measurements - Narrative (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 10, 2018 | Oct. 13, 2017 | Jun. 10, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Outstanding note paid down | $ 400,000 | $ 0 | $ 0 |  |  |
Changes in fair value of contingent consideration | (80,000) | 6,318,000 | $ 18,944,000 |  |  |
Level 3 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Gain (loss) recognized in earnings from change in the fair value of contingent consideration | 80,000 | (6,318,000) |  |  |  |
Contingent consideration payments | 37,645,000 | 23,545,000 |  |  |  |
Fiscal 2019 Acquisitions |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Notes payable |  | 5,500,000 |  |  |  |
Outstanding note paid down |  | 5,100,000 |  |  |  |
Humble Bundle |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
High-end of potential contingent consideration |  |  |  |  | $ 40,000,000.0 |
Contingent consideration | 0 | 20,000,000.0 |  |  |  |
Contingent consideration payments | 20,000,000.0 | 20,000,000.0 |  |  |  |
Ekahau Inc. |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
High-end of potential contingent consideration |  |  |  | $ 15,000,000.0 |  |
Contingent consideration | 0 | 9,100,000 |  |  |  |
Contingent consideration payments | 9,100,000 |  |  |  |  |
Other Business Acquisitions |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
High-end of potential contingent consideration | 23,300,000 |  |  |  |  |
Contingent consideration | 9,100,000 | 8,800,000 |  |  |  |
Contingent consideration payments | 8,600,000 |  |  |  |  |
3.25% Convertible Notes | Convertible Debt |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term debt | $ 593,100,000 | $ 583,600,000 |  |  |  |
Stated interest rate |  |  |  |  |  | 3.25%

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