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ACCOUNTING POLICIES (Property) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment      
Long-lived assets impairment   $ 6,500  
Goodwill impairment   20,000  
Asset Impairment Charges $ 26,500 26,514  
Held-for-sale | Other long-term assets      
Property, Plant and Equipment      
Assets held for sale which are reported within other noncurrent assets $ 1,300 $ 1,300 $ 700
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   14 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   15 years  
Software | Minimum      
Property, Plant and Equipment      
Depreciation/amortization period   2 years  
Software | Maximum      
Property, Plant and Equipment      
Depreciation/amortization period   7 years