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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Employee phantom share plan liability $ 147,744 $ 193,162
Contingent stock liability   130,594
Employee related accruals 81,177 98,481
Accrued professional fees 50,403 67,628
Estimated Litigation Liability, Current 79,346  
Tax related accruals 37,052 45,119
Other accrued expenses and other current liabilities 196,999 181,372
Accrued expenses and other current liabilities 592,721 $ 716,356
Accrued estimated legal costs 10,346  
Reserve for probable claims $ 69,000