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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Insurance and claims accruals | $ 55,233 | $ 54,913
Compensation - related accruals | 12,203 | 16,054
Allowance for uncollectible accounts | 3,958 | 4,070
Operating lease liabilities | 7,033 | 2,530
Other | 1,644 | 2,844
Gross deferred income tax assets | 80,071 | 80,411
Property and equipment | 305,002 | 308,145
Investments in equity securities | 10,985 | 0
Prepaid expenses | 7,269 | 6,333
Operating lease right-of-use assets | 6,955 | 2,485
Investment in partnership | 17,076 | 0
Other | 1,283 | 1,318
Gross deferred income tax liabilities | 348,570 | 318,281
Deferred income tax liabilities, net | $ 268,499 | $ 237,870

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