Business Combinations and Asset Acquisitions (Purchase Price Allocations) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Nov. 22, 2021	Jul. 01, 2021	Dec. 31, 2020
Total goodwill
Goodwill	$ 74,618			$ 0
Acquisition of ECM Transport Group [Member]
Purchase price
Cash consideration paid			$ 155,686
Cash and cash equivalents acquired			13,327
Contingent consideration arrangement			0
Working capital surplus (deficiency)			(1,068)
Total purchase price (fair value of consideration)			141,291
Assets acquired:
Current assets			17,468
Property and equipment			88,632
Intangible assets			37,200
Other non-current assets			3,644
Total assets acquired			146,944
Liabilities assumed:
Current liabilities			7,721
Other long-term liabilities			(2,460)
Total liabilities assumed			(10,181)
NCI
Temporary equity - redeemable noncontrolling interest in ECM			33,556
Total goodwill
Goodwill			$ 38,084
Acquisition of NEHDS [Member]
Purchase price
Cash consideration paid		$ 60,332
Cash and cash equivalents acquired		332
Contingent consideration arrangement		2,500
Working capital surplus (deficiency)		554
Total purchase price (fair value of consideration)		63,054
Assets acquired:
Current assets		3,508
Property and equipment		5,420
Intangible assets		20,000
Other non-current assets		12,122
Total assets acquired		41,050
Liabilities assumed:
Current liabilities		4,014
Other long-term liabilities		(10,516)
Total liabilities assumed		(14,530)
NCI
Temporary equity - redeemable noncontrolling interest in ECM		0
Total goodwill
Goodwill		$ 36,534