(

) Business Segments

We aggregate our

five

current operating segments into

four

reporting segments (Truckload, Dedicated, Intermodal and Brokerage) for financial reporting purposes.

The primary source of our operating revenue is provided by our Truckload segment through a combination of regional short-haul and medium-to-long-haul full-load transportation services. We transport food and other consumer packaged goods that require a temperature-controlled or insulated environment, along with dry freight, across the United States and into and out of Mexico and Canada.

Our Dedicated segment provides customized transportation solutions tailored to meet individual customers’ requirements, utilizing temperature-controlled trailers, dry vans and other specialized equipment within the United States. Our customer contracts range from

three

five

years and are subject to annual rate reviews.

Our Intermodal segment transports our customers’ freight within the United States utilizing our temperature-controlled trailers on railroad flatcars for portions of trips, with the balance of the trips using our tractors or, to a lesser extent, contracted carriers.

Our Brokerage segment develops contractual relationships with and arranges for

third

-party carriers to transport freight for our customers in temperature-controlled trailers and dry vans within the United States and into and out of Mexico through Marten Transport Logistics, LLC, which was established in

2007

and operates pursuant to brokerage authority granted by the DOT. We retain the billing, collection and customer management responsibilities.

The following table sets forth for the periods indicated our operating revenue and operating income by segment. We do

not

prepare separate balance sheets by segment and, as a result, assets are

not

separately identifiable by segment.

	Three Months				Six Months
	Ended June 30,				Ended June 30,
(Dollars in thousands)	2017		2016		2017		2016
Operating revenue:
Truckload revenue, net of fuel surcharge revenue	$	84,480	$	85,103	$	169,291	$	168,045
Truckload fuel surcharge revenue		10,434		8,933		21,281		16,045
Total Truckload revenue		94,914		94,036		190,572		184,090

Dedicated revenue, net of fuel surcharge revenue		38,601		36,654		75,500		72,164
Dedicated fuel surcharge revenue		2,901		2,621		6,279		4,208
Total Dedicated revenue		41,502		39,275		81,779		76,372

Intermodal revenue, net of fuel surcharge revenue		16,877		16,118		33,688		31,972
Intermodal fuel surcharge revenue		2,238		1,664		4,613		3,011
Total Intermodal revenue		19,115		17,782		38,301		34,983

Brokerage revenue		15,980		14,997		34,018		32,574
Total operating revenue	$	171,511	$	166,090	$	344,670	$	328,019

Operating income:
Truckload	$	7,511	$	6,951	$	13,485	$	13,891
Dedicated		5,074		5,134		9,561		9,458
Intermodal		2,040		1,822		4,189		3,751
Brokerage		944		869		2,272		1,801
Total operating income	$	15,569	$	14,776	$	29,507	$	28,901

Truckload segment depreciation expense was

$14.4

million and

$13.9

million, Dedicated segment depreciation expense was

$5.4

million and

$5.1

million, Intermodal segment depreciation expense was

$1.1

million and

$987,000,

and Brokerage segment depreciation expense was

$344,000

and

$376,000,

in the

three

-month periods ended

June 30, 2017

and

2016,

respectively. Truckload segment depreciation expense was

$29.0

million and

$27.6

million, Dedicated segment depreciation expense was

$10.8

million and

$10.0

million, Intermodal segment depreciation expense was

$2.2

million and

$1.9

million, and Brokerage segment depreciation expense was

$678,000

and

$857,000,

in the

six

-month periods ended

June 30, 2017

and

2016,

respectively.