Condensed Consolidated Statements of Cash Flows (Unaudited) Reconciliation of Cash, Restricted Cash, and Cash Equivalents - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents		$ 186,473	$ 168,545	$ 228,957	$ 196,770
Cash and cash equivalents – restricted	[1]	149,571	297,275	251,438	185,792
Other long-term assets	[1]	3,213	3,866	3,117	2,783
U.S. Xpress
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition escrow	[2]	$ 0	$ 0	$ 444,657	$ 0

[1] Reflects cash and cash equivalents that are primarily restricted for claims payments.

[2] Reflects restricted cash for the U.S. Xpress acquisition which closed on July 1, 2023.