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OPERATING SEGMENT DATA - Operating Expenses by Category (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
OPERATING EXPENSES      
Salaries, wages, and benefits $ 1,550,859 $ 1,368,588 $ 1,408,409
Rents, purchased transportation, and other costs of services 1,570,050 974,835 934,958
Fuel, supplies, and expenses 324,380 250,221 316,047
Depreciation and amortization 124,221 118,391 112,466
Other 129,571 129,850 126,146
Asset impairment     26,514
Total consolidated operating expenses 3,699,081 2,841,885 2,924,540
Gain on sale of subsidiaries 6,923    
Gain on sale of property and equipment $ 8,520 $ 2,376 $ 5,247