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Segment Reporting (Notes)
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
 
The Company has two reportable segments: Expedited Freight and Intermodal. The Company evaluates segment performance based on income from operations. Segment results include intersegment revenues and shared costs.  Costs related to the corporate headquarters, shared services and shared assets, such as trailers, are allocated to each segment based on usage. Shared assets are not allocated to each segment, but rather the shared assets, such as trailers, are allocated to the Expedited Freight segment.

The accounting policies applied to each segment are the same as those described in the Summary of Significant Accounting Policies as disclosed in Note 1, except for certain self-insurance loss reserves related to vehicle liability and workers’ compensation. Each segment is allocated an insurance premium and deductible that corresponds to the self-insured retention limit for that particular segment. Any self-insurance loss exposure beyond the deductible allocated to each segment is recorded in Eliminations & Other.      
    
Segment results from operations for the years ended December 31, 2020, 2019 and 2018 are as follows.
Year ended December 31, 2020Expedited FreightIntermodalEliminations & OtherConsolidated
External revenues$1,070,106 $199,567 $— $1,269,673 
Intersegment revenues2,195 36 (2,331)(100)
Depreciation19,824 3,693 120 23,637 
Amortization7,203 6,285 — 13,488 
Income (loss) from continuing operations71,266 16,391 (13,733)73,924 
Total assets905,081 221,963 (153,750)973,294 
Purchases of property and equipment 19,820 448 — 20,268 

Year ended December 31, 2019 (As Adjusted)Expedited FreightIntermodalEliminations & OtherConsolidated
External revenues$997,877 $217,606 $— $1,215,483 
Intersegment revenues3,057 105 (3,458)(296)
Depreciation23,087 3,086 38 26,211 
Amortization4,335 5,848 — 10,183 
Income (loss) from continuing operations103,640 23,679 (14,903)112,416 
Total assets717,555 206,576 (24,909)899,222 
Purchases of property and equipment21,290 717 — 22,007 

Year ended December 31, 2018 (As Adjusted)Expedited FreightIntermodalEliminations & OtherConsolidated
External revenues$937,289 $200,750 $— $1,138,039 
Intersegment revenues4,678 256 (5,360)(426)
Depreciation25,707 1,719 296 27,722 
Amortization3,499 4,610 — 8,109 
Income (loss) from continuing operations103,652 23,266 (9,702)117,216 
Total assets555,501 167,002 (10,193)712,310 
Purchases of property and equipment38,710 854 — 39,564 

Revenue from the individual services within the Expedited Freight segment for the years ended December 31, 2020, 2019 and 2018 are as follows:
 Year endedYear endedYear ended
 December 31,
2020		December 31,
2019		December 31,
2018
Expedited freight revenue:  
Network$625,517 $675,312 $677,416 
Truckload$194,058 $196,855 $196,980 
Final Mile$224,475 $100,555 $39,400 
Other28,251 28,212 28,171 
Total $1,072,301 $1,000,934 $941,967