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Segment Information - Schedule of Financial Information with Respect to our Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenue from operations $ 5,814,810 $ 5,866,152 $ 6,260,077
Less significant expenses:      
Salaries and wages 1,958,390 1,912,231 1,995,332
Employee benefit costs 730,924 717,445 721,503
Operating supplies and expenses 635,320 718,326 852,955
General supplies and expenses 176,546 162,416 159,998
Operating taxes and licenses 144,690 145,642 141,239
Insurance and claims 92,359 75,368 58,301
Communications and utilities 40,827 43,269 40,584
Depreciation and amortization 344,568 324,435 276,050
Purchased transportation 122,815 121,516 158,111
Miscellaneous expenses, net 24,373 4,831 15,372
Non-operating income (13,599) (7,103) (717)
Provision for income taxes 371,524 408,274 464,190
Net income $ 1,186,073 $ 1,239,502 $ 1,377,159