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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure GOODWILL AND INTANGIBLE ASSETS
The following table summarizes changes in the carrying amount of goodwill by segment for the year ended December 31, 2021 (in thousands):
TTSWerner LogisticsTotal
Balance as of December 31, 2020$— $— $— 
Goodwill recorded in acquisition of ECM44,710 — 44,710 
Goodwill recorded in acquisition of NEHDS— 36,534 36,534 
Purchase accounting adjustments (1)
(6,626)— (6,626)
Balance as of December 31, 2021$38,084 $36,534 $74,618 
(1) The purchase accounting adjustments are primarily attributable to post-closing adjustments related to assets assumed in, and the redeemable noncontrolling interest associated with, the acquisition of ECM.
Acquired intangible assets consists of the following as of December 31, 2021 (in thousands):
Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Customer relationships$40,200 $(1,177)$39,023 
Trade names17,000 (708)16,292 
Total intangible assets$57,200 $(1,885)$55,315 
No acquired intangible assets were recorded on the consolidated balance sheet as of December 31, 2020. Amortization expense on intangible assets was $1.9 million for the year ended December 31, 2021. As of December 31, 2021, the estimated future amortization expense for intangible assets by year is as follows (in thousands):
Estimated
Amortization
Expense
2022$5,437 
20235,437 
20245,437 
20255,437 
20265,437 
Thereafter (to 2033)28,130 
Total$55,315