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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Business Combinations and Asset Acquisitions (Narrative) (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Jul. 01, 2021 USD ($) count	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
BMO Harris Bank N.A. Term Loan Mature May 14, 2024
Business Acquisition [Line Items]
Fixed rate term loan amount		$ 100,000	$ 100,000
Acquisition of ECM Transport Group [Member]
Business Acquisition [Line Items]
Percentage of equity interests acquired	80.00%
Total purchase price (fair value of consideration)	$ 141,291
Percentage of equity interests owned by noncontrolling interest	20.00%
Net income attributable to redeemable noncontrolling interest		1,300
Distributions to redeemable noncontrolling interest holders		35
Trucks \| count	500
Trailers \| count	2,000
Terminals \| count	8
Drop lots \| count	18
Business acquisition transaction costs	$ 1,000
Intangible assets	$ 52,200
Amortization of intangible assets		1,200	$ 1,200
Payments to acquire businesses deposited in escrow		$ 1,500