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Accrued Payroll and Benefit Costs - Accrued Payroll/Benefit Costs and Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Payables and Accruals [Abstract] |  |
Payroll and benefits | $ 306,178 | $ 311,169
Payroll taxes | 81,742 | 67,712
Workers’ compensation | 19,924 | 18,996
Accrued payroll and benefit costs | 407,844 | $ 397,877
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Applicable payroll taxes deferred | 102,200 |
Accrued Payroll and Benefits Costs |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Applicable payroll taxes deferred | 51,100 |
Other Liabilities |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Applicable payroll taxes deferred | $ 51,100 |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory payroll taxes incurred through that date and withheld from employees pertaining to services received from them, including entity's matching share of the employees FICA taxes and contributions to the state and federal unemployment insurance programs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6935-107765 + Details
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