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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax assets:    
Insurance liabilities $ 47,602 $ 47,022
Pension liability 6,789 2,733
Operating lease liabilities 68,652 68,158
Deferred compensation 36,790 32,685
Accrued federal payroll taxes 27,428 [1] 0
Other (including liabilities and reserves) 29,816 25,647
Total deferred income tax assets 217,077 176,245
Valuation allowance for deferred tax assets (3,856) (3,463)
Net deferred income tax assets 213,221 172,782
Deferred income tax liabilities:    
Goodwill and identifiable intangible assets (146,821) (156,604)
Operating lease right-of-use assets (64,434) (65,090)
Depreciation of property, plant and equipment (23,958) (18,622)
Other (7,444) (4,212)
Total deferred income tax liabilities (242,657) (244,528)
Net deferred income tax liabilities $ (29,436) $ (71,746)
[1] Represents employer Social Security tax payments deferred under the CARES Act.