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ACCOUNTING POLICIES - Property (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment      
Lease impairment charges $ 30,200 $ 30,162  
Other long-term assets      
Property, Plant and Equipment      
Assets held for sale   $ 1,500 $ 800
Structures | Minimum      
Property, Plant and Equipment      
Depreciation/amortization period   15 years  
Structures | Maximum      
Property, Plant and Equipment      
Depreciation/amortization period   60 years  
Revenue Equipment | Minimum      
Property, Plant and Equipment      
Depreciation/amortization period   3 years  
Revenue Equipment | Maximum      
Property, Plant and Equipment      
Depreciation/amortization period   22 years  
Service, office, and other equipment | Minimum      
Property, Plant and Equipment      
Depreciation/amortization period   2 years  
Service, office, and other equipment | Maximum      
Property, Plant and Equipment      
Depreciation/amortization period   16 years  
Software | Minimum      
Property, Plant and Equipment      
Depreciation/amortization period   2 years  
Software | Maximum      
Property, Plant and Equipment      
Depreciation/amortization period   7 years