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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Stock based compensation awards, fair value of awards outstanding |  | $ 49,500 |  | $ 49,500 |  |  |
Deferred compensation arrangements, liability, noncurrent |  | 37,300 |  | 37,300 |  |  |
Stock compensation expense (benefit) | $ 1,921 | 580 | $ 3,892 | (5,484) |  |  |
YP Acquisition |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Shares held in escrow (in shares) |  |  |  |  |  |  | 1.8
Number of shares expected to be returned by the seller | 0.7 |  | 0.7 |  |  |  |
Amount to be paid before allowance of tax credit | $ 8,000 |  | $ 8,000 |  |  |  |
Indemnification Asset | Fair Value, Inputs, Level 1 |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair value of indemnification asset | 25,200 |  | 25,200 |  | $ 24,300 |  |
Change in fair value | 800 |  | 800 |  |  |  |
Indemnification Asset | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair value of indemnification asset | $ 0 | 25,371 | 0 | 25,371 | $ 0 | $ 29,789 |
Change in fair value |  | $ (600) | $ 0 | $ (4,418) |  |  |

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