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Fair Value Measurements - Level 3 Fair Value of Certain Assets Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
43830 | $ 182,377 |  |
Decrease from divestiture | (7,379) |  |
Carrying value prior to impairment |  | $ 174,998 |
Impairment charge | (30,945) |  |
Carrying value after impairment | 144,053 |  |
Carrying value of assets not subject to impairment charge | 94,073 |  |
Balance as of December 31, 2020 | $ 238,126 | $ 276,450 | $ 198,622

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