Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments			2
Operating revenue
Total Operating Revenue	$ 553,703	$ 475,021	$ 1,070,891	$ 925,781
Operating Income (Loss)
Total Operating Income	6,468	8,906	6,258	16,904
Truckload Segment [Member]
Operating revenue
Total Operating Revenue	465,177	378,533	888,437	747,453
Operating Income (Loss)
Total Operating Income	910	8,745	1,183	15,472
Brokerage Segment [Member]
Operating revenue
Total Operating Revenue	88,526	96,488	182,454	178,328
Operating Income (Loss)
Total Operating Income	$ 5,558	$ 161	$ 5,075	$ 1,432