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Employment and Compensation Arrangements - CPA Global Phantom Plan (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Nov. 23, 2020 | Oct. 01, 2020 | Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |  |  |
Goodwill | $ 6,036,515 |  | $ 6,042,964 | $ 2,861 |  | $ 1,328,045
Operating Expenses | 497,940 | $ 268,900 |  |  |  |
Restructuring and impairment | 67,895 | $ 7,754 |  |  |  |
CPA Global |  |  |  |  |  |
Share-based Payment Arrangement [Abstract] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 3,951,239 |
Shareholders' Equity |  |  |  |  |  |
Other non-current liabilities |  |  |  |  | (24,307) |
Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |
Share-based Payment Arrangement [Abstract] |  |  |  |  |  |
Cost of Revenue and Selling, General and Administrative Expense | 29,479 |  |  |  |  |
Restructuring and impairment | 3,228 |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |
Cost of Revenue and Selling, General and Administrative Expense | $ 29,479 |  |  |  |  |
Revision Of Prior Period Error Correction Adjustment Amd No 2 | CPA Global |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |
Other non-current liabilities |  |  |  |  | $ (19,478) |

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