Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets Acquired		$ 85,000
Finite-lived Intangible Assets Acquired		53,400
Indefinite-lived Intangible Assets Acquired		31,600
Customer-Related Intangible Assets		52,800
Customer-Related Intangible Assets, Smith Transport		21,200
Customer-Related Intangible Assets, CFI		31,600
Finite-Lived Intangible Assets, Amortization Expense		3,700	$ 2,400	$ 2,400
Finite-Lived Intangible Assets, Gross	$ 94,575	94,575	41,200
Finite-Lived Intangible Assets, Accumulated Amortization	22,498	22,498	18,845
Finite-Lived Intangible Assets, Net	72,077	72,077	22,355
GOODWILL	320,675	320,675	168,295
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months	5,800	5,800
Finite-Lived Intangible Assets, Amortization Expense, Year Two	5,500	5,500
Finite-Lived Intangible Assets, Amortization Expense, Year Three	5,500	5,500
Finite-Lived Intangible Assets, Amortization Expense, Year Four	5,500	5,500
Finite-Lived Intangible Assets, Amortization Expense, Year Five	5,500	5,500
Goodwill, Acquired During Period, Smith Transport	(1,800)	40,297
Goodwill, Acquired During Period, CFI	5,700	112,083
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	75,836	75,836	23,000
Finite-Lived Intangible Assets, Accumulated Amortization	8,441	8,441	5,842
Finite-Lived Intangible Assets, Net	67,395	67,395	17,158
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	12,900	12,900	12,900
Finite-Lived Intangible Assets, Accumulated Amortization	9,700	9,700	9,220
Finite-Lived Intangible Assets, Net	3,200	3,200	3,680
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	5,839	5,839	5,300
Finite-Lived Intangible Assets, Accumulated Amortization	4,357	4,357	3,783
Finite-Lived Intangible Assets, Net	$ 1,482	$ 1,482	$ 1,517
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life		15 years	15 years
Minimum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life		6 months	6 months
Minimum [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life		1 year	1 year
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life		20 years	20 years
Maximum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years	10 years
Maximum [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years	10 years