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Segment Reporting
 6 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Segment Reporting SEGMENT REPORTING
The Company's two reportable segments are Trucking and USAT Logistics. In determining its reportable segments, the Company's chief operating decision maker focuses on financial information, such as operating revenue, operating expense categories, operating ratios and operating income, as well as on key operating statistics, to make operating decisions.
 
Trucking. Trucking is comprised of one-way truckload and dedicated freight motor carrier services. Truckload provides motor carrier services as a medium-haul common and contract carrier. USA Truck has provided truckload motor carrier services since its inception, and continues to derive the largest portion of its gross revenue from these services. Dedicated freight provides truckload motor carrier services to specific customers for movement of freight over particular routes at specified times.

USAT Logistics. USAT Logistics' service offerings consist of freight brokerage, logistics, and rail intermodal services. Each of these service offerings match customer shipments with available equipment of authorized third-party motor carriers and other service providers. The Company provides these services to many existing Trucking customers, many of whom prefer to rely on a single service provider, or a small group of service providers, to provide all their transportation solutions.
 
Revenue equipment assets are not allocated to USAT Logistics as freight services for customers are brokered through arrangements with third-party motor carriers who utilize their own equipment. To the extent rail intermodal or other USAT Logistics operations require the use of Company-owned assets, they are obtained from the Company's Trucking segment on an as-needed basis. Depreciation and amortization expense is allocated to USAT Logistics based on the Company-owned assets specifically utilized to generate USAT Logistics revenue. All intercompany transactions between segments reflect rates similar to those that would be negotiated with independent third parties. All other expenses for USAT Logistics are specifically identifiable direct costs or are allocated to USAT Logistics based on relevant cost drivers, as determined by management.
A summary of operating revenue by segment is as follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
Operating revenue2019 2018 2019 2018 
(in thousands)
Trucking revenue (1)$96,476 $85,685 $191,378 $164,531 
Trucking intersegment eliminations(407)(116)(769)(229)
Trucking operating revenue96,069 85,569 190,609 164,302 
USAT Logistics revenue39,575 50,616 81,025 97,391 
USAT Logistics intersegment eliminations(2,022)(804)(4,038)(1,299)
USAT Logistics operating revenue37,553 49,812 76,987 96,092 
Total operating revenue$133,622 $135,381 $267,596 $260,394 
 
(1) Includes foreign revenue of $9.4 million and $11.0 million for the three months ended June 30, 2019 and 2018, respectively, and $19.0 million and $20.9 million for the six months ended June 30, 2019 and 2018, respectively. All foreign revenue is collected in U.S. dollars.

A summary of operating income by segment is as follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
Operating income
2019 2018 2019 2018 
(in thousands) 
Trucking$837 $2,153 $2,445 $1,689 
USAT Logistics1,146 2,158 3,459 5,014 
Total operating income$1,983 $4,311 $5,904 $6,703 

A summary of depreciation and amortization by segment is as follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
Depreciation and amortization2019 2018 2019 2018 
(in thousands) 
Trucking$8,853 $7,299 $17,432 $14,325 
USAT Logistics272 178 511 332 
Total depreciation and amortization$9,125 $7,477 $17,943 $14,657