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Accounts Payable, Accrued Expenses and Other Liabilities - Components of Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued compensation	$ 88,292	$ 331,288
Payroll taxes payable	105,555	61,564
Financial guarantee liability	23,232	29,581	$ 15
Deferred rent	19,474	0
Contingent consideration	10,132	14,519
Total	$ 246,685	$ 436,952

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

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Amount of excess of rental payment required by lease over rental income recognized, classified as noncurrent.

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