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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |  |
Insurance liabilities |  | $ 50,316 | $ 47,602
Pension liability |  | 0 | 6,789
Operating lease liabilities |  | 76,451 | 68,652
Deferred compensation |  | 40,080 | 36,790
Accrued federal payroll taxes | [1] | 14,235 | 27,428
Other (including liabilities and reserves) |  | 31,252 | 29,816
Total deferred income tax assets |  | 212,334 | 217,077
Valuation allowance for deferred tax assets |  | (2,465) | (3,856)
Net deferred income tax assets |  | 209,869 | 213,221
Deferred income tax liabilities: |  |  |
Goodwill and identifiable intangible assets |  | (154,382) | (146,821)
Operating lease right-of-use assets |  | (71,759) | (64,434)
Depreciation of property, plant and equipment |  | (25,341) | (23,958)
Pension asset |  | (1,847) | 0
Other |  | (7,491) | (7,444)
Total deferred income tax liabilities |  | (260,820) | (242,657)
Net deferred income tax liabilities |  | $ (50,951) | $ (29,436)
[1] | Represents employer Social Security tax payments deferred under the CARES Act.

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