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Detail of Certain Balance Sheet Accounts - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accounts payable, trade | $ 798,023 | $ 798,718
Accrued compensation and related expenses | 378,002 | 316,237
Contingent consideration liabilities, current portion | 3,466 | 77,618
Accrued insurance, current portion | 80,926 | 69,307
Income and franchise taxes payable | 32,315 | 58,353
Unearned revenues, current portion | 53,562 | 33,192
Sales and use taxes payable | 30,587 | 28,721
Other accrued expenses | 132,913 | 107,413
Accounts payable and accrued expenses, total | $ 1,509,794 | $ 1,489,559

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