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Fair Value Measurements (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  | $ 61,661 | $ 4,879 |
Impairment and other losses | $ 77,240 | $ 6,655 | 96,399 | 8,599 | $ 87,204
Operating lease charge |  |  | 22,667 |  |
Impairment of right-of-use asset |  |  | 9,969 | 3,700 |
Variable lease cost |  |  | 14,640 | 18,879 |
Lessee, Lease Property in New York [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Variable lease cost |  |  | $ 12,698 |  |
Measurement Input, Discount Rate [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.051 |  | 0.051 |  |
Senior Notes | Reported Value Measurement [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt Instrument, Fair Value Disclosure | $ 870,256 | 900,000 | $ 870,256 | 900,000 |
Senior Notes | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt Instrument, Fair Value Disclosure | $ 883,580 | $ 812,250 | $ 883,580 | $ 812,250 |

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