Segment Information (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Revenues
Truckload	$	376,448	$	374,405	$	758,540	$	743,524
Brokerage		46,029		39,457		96,505		85,701
Total Operating Revenue	$	422,477	$	413,862	$	855,045	$	829,225
Operating Income
Truckload	$	20,428	$	7,503	$	21,628	$	17,344
Brokerage		(4,151)		1,284		(9,019)		4,081
Total Operating Income	$	16,277	$	8,787	$	12,609	$	21,425