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	$ 129,716	$ 57,752
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	31,277	45,119
Other accrued expenses and other current liabilities	187,774	170,108
Accrued expenses and other current liabilities	559,693	$ 569,682
Accrued estimated legal costs	10,346
Reserve for probable claims	$ 69,000