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OPERATING SEGMENT DATA - (Operating Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
OPERATING EXPENSES                      
Salaries, wages, and benefits                 $ 1,408,409 $ 1,398,348 $ 1,361,224
Rents, purchased transportation, and other costs of services                 934,958 989,006 869,584
Fuel, supplies, and expenses                 316,047 325,126 304,126
Depreciation and amortization                 112,466 108,635 103,068
Other                 126,146 123,998 124,144
Asset impairment $ 26,500               26,514    
Multiemployer pension fund withdrawal liability charge             $ 37,900     37,922  
Restructuring costs                   1,655 2,963
Total consolidated operating expenses $ 728,647 $ 756,355 $ 736,290 $ 703,248 $ 737,117 $ 770,103 $ 790,194 $ 687,276 $ 2,924,540 $ 2,984,690 $ 2,765,109