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Acquisitions, Goodwill, Intangible Assets and Other Long-Lived Assets (Tables)
12 Months Ended
Dec. 31, 2020
Intangible Assets [Line Items]  
Schedule of Intangible Assets
The Company amortizes certain acquired identifiable intangible assets on a straight-line basis over their estimated useful lives, which range from 1 to 20 years. The acquired intangible assets have a weighted-average useful life as follows:

Intangible AssetsWeighted-Average Useful Life
Customer relationships15 years
Non-compete agreements4 years
Trade names4 years
Changes in Carrying Amount of Acquired Intangible Assets
Changes in the carrying amount of acquired intangible assets during 2020 and 2019 are summarized as follows:
December 31, 2020December 31, 2019
Carrying ValueAccumulated AmortizationNet Carrying ValueCarrying ValueAccumulated AmortizationNet Carrying Value
Customer relationships1
$228,416 $(85,930)$142,486 $196,225 $(73,868)$122,357 
Non-compete agreements8,125 (5,579)2,546 6,652 (4,152)2,500 
Trade names1,500 (1,500)— 1,500 (1,500)— 
Total$238,041 $(93,009)$145,032 $204,377 $(79,520)$124,857 
    
1 Carrying value as of December 31, 2020 and 2019 is inclusive of $16,501 of accumulated impairment.
Business Acquisition [Line Items]  
Weighted-Average Assumptions The weighted-average assumptions under the Monte Carlo simulation model were as follows for the year ended December 31, 2020 and 2019:
FSA Earn-Out
December 31, 2020December 31, 2019
Risk-free rate1.4%2.2%
Revenue discount rate3.2%4.4%
Revenue volatility8.0%5.0%
Purchase Price Allocation Assets acquired and liabilities assumed as of the acquisition date are presented in the following table:
MMTSouthwestFSAO.S.T.Linn StarCLW
July 25, 2018October 28, 2018April 21, 2019July 14, 2019January 12, 2020October 11, 2020
Tangible assets:
Cash$— $— $202 $— $1,308 $— 
Other receivables— — 1,491 — — — 
Prepaid expenses and other current assets— — 1,182 — 
Property and equipment81 933 40 10,371 605 — 
Right-of-use lease assets— — 3,209 1,672 10,011 811 
Total tangible assets81 933 4,942 12,043 13,106 811 
Intangible assets:
Non-compete agreements43 650 900 850 450 1,000 
Customer relationships1,659 9,200 17,900 5,700 29,800 1,500 
Goodwill1,954 5,467 19,963 2,050 25,234 3,000 
Total intangible assets3,656 15,317 38,763 8,600 55,484 5,500 
Total assets acquired3,737 16,250 43,705 20,643 68,590 6,311 
Liabilities assumed:
Current liabilities— — 8,466 — 1,340 — 
Other liabilities— — 5,030 — — — 
Operating lease liabilities— — 3,209 1,672 10,011 811 
Finance lease obligations— — — 6,971 — — 
Total liabilities assumed— — 16,705 8,643 11,351 — 
Net assets acquired$3,737 $16,250 $27,000 $12,000 $57,239 $5,500 
Weighted-Average Useful Life of Acquired Intangible Assets
The weighted-average useful life of acquired intangible assets as of the acquisition date are summarized in the following table:
FSAO.S.T.Linn StarCLW
Customer relationships15 years10 years15 years7 years
Non-compete agreements5 years3 years1 year5 years
Goodwill [Line Items]  
Schedule of Goodwill
Changes in the carrying amount of goodwill during the years ended December 31, 2020 and 2019 are summarized as follows:
Expedited FreightIntermodalConsolidated
Balance as of December 31, 2018$117,071 $76,615 $193,686 
Acquisitions19,963 2,050 22,013 
Balance as of December 31, 2019137,034 78,665 215,699 
Acquisitions 28,234 1,049 29,283 
Balance as of December 31, 2020$165,268 $79,714 $244,982