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Retirement Plans (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 31, 2021 | Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |
Deferred compensation plan | $ 88,965,000 | $ 50,000 | $ 89,327,000 | $ (115,000) |  |
Accruals and other current liabilities | 317,271,000 |  | 317,271,000 |  |  | $ 226,793,000
Deferred compensation plan liabilities | 89,174,000 |  | 89,174,000 |  |  | 2,422,000
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |
Accruals and other current liabilities | 7,306,000 |  | 7,306,000 |  |  | 169,000
Deferred compensation plan liabilities | 89,174,000 |  | 89,174,000 |  |  | 2,422,000
Total DCP liabilities | 96,480,000 |  | 96,480,000 |  |  | $ 2,591,000
Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |
Deferred compensation plan | 88,965,000 | 50,000 | 89,327,000 | (115,000) |  |
DCP participant deferrals | 527,000 | 804,000 | 2,020,000 | 2,602,000 |  |
Contributions by employer | 0 | $ 0 | 0 | $ 0 |  |
Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | DCP, One-Time Inducement |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |
Reclassified cumulative compensation cost | 4,739,000 |  | 4,739,000 |  |  |
Deferred compensation plan | 90,721,000 |  | 90,721,000 |  |  |
Deferred compensation liability | $ 95,460,000 |  | $ 95,460,000 |  |  |
Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Class B Common Stock |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |
Phantom shares, maximum elections (in shares) |  |  |  |  | 1,500,000 |
Reduction in shares outstanding, basic (in shares) |  |  |  |  | 1,500,000 |
Reduction in shares outstanding, diluted (in shares) |  |  |  |  | 1,500,000 |
Phantom shares issuable (in shares) | 25,503,049 |  | 25,503,049 |  |  | 30,590,955

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