The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets (Details) - Customer Relationships - USD ($) $ in Thousands			12 Months Ended
	May 17, 2020	May 06, 2019	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Net
Gross Value			$ 4,876	$ 1,808
Accumulated Amortization			(770)	(211)
Net			4,106	1,597
Useful life		7 years
Amortization of intangible assets			600	200
Finite-Lived Intangible Assets, Net, Amortization Expense
2021			798
2022			746
2023			695
2024			646
2025			615
EH Trucking
Finite-Lived Intangible Assets, Net
Gross Value			1,703	1,808
Accumulated Amortization			(500)	(211)
Net			1,203	1,597
Useful life		7 years
Finite-Lived Intangible Assets, Net, Amortization Expense
2021			274
2022			254
2023			235
2024			218
2025			202
Comcar
Finite-Lived Intangible Assets, Net
Gross Value			3,173	0
Accumulated Amortization			(270)	0
Net			2,903	$ 0
Useful life	7 years
Finite-Lived Intangible Assets, Net, Amortization Expense
2021			524
2022			492
2023			460
2024			428
2025			$ 413