10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 0R 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

 For the fiscal year ended December 31, 2018

Commission file number 0-15010

MARTEN TRANSPORT, LTD.

(Exact name of registrant as specified in its charter)

DELAWARE		39-1140809
(State of incorporation)		(I.R.S. Employer Identification no.)
129 MARTEN STREET
MONDOVI, WISCONSIN	54755	(715) 926-4216
(Address of principal executive offices)	(Zip Code)	(Registrant’s telephone number)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class:	Name of each exchange on which registered:
COMMON STOCK, PAR VALUE $.01 PER SHARE	THE NASDAQ STOCK MARKET LLC
	(NASDAQ GLOBAL SELECT MARKET)

Securities registered pursuant to Section 12(g) of the Act:
NONE

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. YES ☐ NO ☒

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Exchange Act. YES ☐ NO ☒

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YES ☒ NO ☐

Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ☒

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒	Accelerated filer ☐
Smaller reporting company ☐	Non-accelerated filer ☐
Emerging growth company ☐

If an emerging growth company, indicate by check mark if the Registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Exchange Act Rule 12b-2). YES ☐ NO ☒

As of June 29, 2018 (the last business day of the Registrant’s most recently completed second fiscal quarter), the aggregate market value of the Common Stock of the Registrant (based upon the closing price of the Common Stock at that date as reported by the NASDAQ Global Select Market), excluding outstanding shares beneficially owned by directors and executive officers, was $995,574,000.

As of February 18, 2019, 54,469,612 shares of Common Stock of the Registrant were outstanding.

Part III of this Annual Report on Form 10-K incorporates by reference information (to the extent specific sections are referred to in this Report) from the Registrant’s Proxy Statement for the annual meeting to be held May 7, 2019, or 2019 Proxy Statement.

TABLE OF CONTENTS

		Page
PART I
ITEM 1.	BUSINESS	1
ITEM 1A.	RISK FACTORS	6
ITEM 1B.	UNRESOLVED STAFF COMMENTS	11
ITEM 2.	PROPERTIES	11
ITEM 3.	LEGAL PROCEEDINGS	11
ITEM 4.	MINE SAFETY DISCLOSURES	11
ITEM 4A.	EXECUTIVE OFFICERS OF THE REGISTRANT	12
PART II
ITEM 5.	MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES	13
ITEM 6.	SELECTED FINANCIAL DATA	15
ITEM 7.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	16
ITEM 7A.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	29
ITEM 8.	FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA	30
ITEM 9.	CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE	51
ITEM 9A.	CONTROLS AND PROCEDURES	51
ITEM 9B.	OTHER INFORMATION	51
PART III
ITEM 10.	DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE	52
ITEM 11.	EXECUTIVE COMPENSATION	52
ITEM 12.	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS	52
ITEM 13.	CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE	52
ITEM 14.	PRINCIPAL ACCOUNTANT FEES AND SERVICES	53
PART IV
ITEM 15.	EXHIBITS AND FINANCIAL STATEMENT SCHEDULES	53
ITEM 16.	FORM 10-K SUMMARY	57
OTHER
Signature Page		58

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FORWARD-LOOKING INFORMATION

This Annual Report on Form 10-K contains certain forward-looking statements. Such statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Any statements not of historical fact may be considered forward-looking statements. Written words such as “may” “expect,” “believe,” “anticipate,” “plan,” “goal,” or “estimate,” or other variations of these or similar words, identify such statements. These statements by their nature involve substantial risks and uncertainties, and actual results may differ materially from those expressed in such forward-looking statements. Important factors known to us that could cause such material differences are identified in this Annual Report on Form 10-K under the heading “Risk Factors” beginning on page 6. We undertake no obligation to correct or update any forward-looking statements, whether as a result of new information, future events, or otherwise. You are advised, however, to consult any future disclosures we make on related subjects in future filings with the Securities and Exchange Commission.

References in this Annual Report to “we,” “us,” “our,” or the “Company” or similar terms refer to Marten Transport, Ltd. and its consolidated subsidiaries unless the context otherwise requires.

PART I

ITEM 1. BUSINESS

Overview

We have strategically transitioned from a long-haul carrier to a multifaceted business offering a network of truck-based transportation capabilities across our five distinct business platforms – Truckload, Dedicated, Intermodal, Brokerage and MRTN de Mexico. We are one of the leading temperature-sensitive truckload carriers in the United States, specializing in transporting and distributing food and other consumer packaged goods that require a temperature-controlled or insulated environment. Our dry freight services are expanding, with 1,600 dry vans operating as of December 31, 2018. In 2018, we generated $787.6 million in operating revenue. Approximately 58% of our Truckload and Dedicated revenue in 2018 resulted from hauling temperature-sensitive products and 42% from hauling dry freight. We operate throughout the United States and in parts of Canada and Mexico, with substantially all of our revenue generated from within the United States. We provide regional truckload carrier services in the Southeast, West Coast, Midwest, South Central and Northeast regions. Our primary medium-to-long-haul traffic lanes are between the Midwest and the West Coast, Southwest, Southeast, and the East Coast, as well as from California to the Pacific Northwest. In 2018, our average length of haul was 433 miles.

Our growth strategy is to expand our business organically by offering shippers a high level of service and significant freight capacity. We market primarily to shippers that offer consistent volumes of freight in the lanes we prefer and are willing to compensate us for a high level of service. With our fleet of 2,755 company and independent contractor tractors, we offer service levels that include up to 99% on-time performance and delivery within the narrow time windows often required when shipping perishable commodities.

We have four reporting segments – Truckload, Dedicated, Intermodal and Brokerage. Financial information regarding these segments can be found in Footnote 3 to the Notes to Consolidated Financial Statements under Item 8 of this Form 10-K.

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 agreements with customers range from three to 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.

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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.

Operating results of our MRTN de Mexico business which offers our customers door-to-door service between the United States and Mexico with our Mexican partner carriers is reported within our Truckload and Brokerage segments.

Organized under Wisconsin law in 1970, we are a successor to a sole proprietorship Roger R. Marten founded in 1946. In 1988, we reincorporated under Delaware law. Our executive offices are located at 129 Marten Street, Mondovi, Wisconsin 54755. Our telephone number is (715) 926-4216.

We maintain a website at www.marten.com. We are not including the information contained on our website as a part of, nor incorporating it by reference into, this Annual Report on Form 10-K. We post on our website, free of charge, documents that we file with or furnish to the Securities and Exchange Commission, including our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and proxy statements, as soon as reasonably practicable after we electronically file such material with, or furnish such material to, the Securities and Exchange Commission. We also provide a link on our website to Forms 3, 4 and 5 that our officers, directors and 10% stockholders file with the Securities and Exchange Commission pursuant to Section 16(a) of the Securities Exchange Act of 1934.

Marketing and Operations

We approach our business as an integrated effort of marketing and operations. We target food and consumer packaged goods companies whose products require temperature-sensitive services and who ship multiple truckloads per week. By emphasizing high-quality service, we seek to become a core carrier for our customers. In 2018, our largest customer was Walmart.

Our marketing efforts are conducted by a staff of 238 sales, customer service and support personnel under the supervision of our senior management team. Marketing personnel travel within their regions to solicit new customers and maintain contact with existing customers. Customer service managers regularly contact customers to solicit additional business on a load-by-load basis.

Our operations and sales personnel strive to improve our asset productivity by seeking freight that allows for rapid turnaround times, minimizes non-revenue miles between loads, and carries a favorable rate structure. Once we have established a customer relationship, customer service managers work closely with our fleet managers to match customer needs with our capacity and the location of revenue equipment. Fleet managers use our optimization system to assign loads to satisfy customer and operational requirements, as well as to meet the routing needs of our drivers. We attempt to route most of our trucks over selected operating lanes, which we believe assists us in meeting customer requirements, balancing traffic, reducing non-revenue miles, and improving the reliability of delivery schedules.

We employ technology in our operations when we believe that it will allow us to operate more efficiently and the investment is cost-justified. Examples of the technologies we employ include:

● Terrestrial and satellite-based tracking and messaging that allows us to communicate with our drivers, obtain load position updates, provide our customers with freight visibility, and download operating information such as fuel mileage and idling time for the tractor engines and temperature setting and run time for the temperature-control units on our trailers.

● Freight optimization software that assists us in selecting loads that match our overall criteria, including profitability, repositioning, identifying capacity for expedited loads, driver availability and home time, and other factors.

● Electronic data interchange and internet communication with customers concerning freight tendering, invoices, shipment status, and other information.

● Electronic logging devices in our tractors to monitor drivers’ hours of service.

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● Auxiliary power units installed on our company-owned tractors that allow us to decrease fuel costs associated with idling our tractors.

● Fuel-routing software that optimizes the fuel stops for each trip to take advantage of volume discounts available in our fuel network.

We believe this integrated approach to our marketing and operations, coupled with our use of technology, has allowed us to provide our customers with a high level of service and support our revenue growth in an efficient manner. For example, we produced a non-revenue mile percentage of 6.2% during 2018, which points to the efficiency of our operations and we believe compares favorably to other temperature-sensitive and dry van trucking companies.

Major Customers

A significant portion of our revenue is generated from our major customers. In 2018, our top 30 customers accounted for approximately 65% of our revenue, and our top ten customers accounted for 46% of our revenue. We have emphasized increasing our customer diversity which is shown by the decrease in the portion of our revenue with our top customers. In 2010, our top 30 customers accounted for approximately 78% of our revenue, and our top ten customers accounted for 52% of our revenue. Eight of our top ten customers have been significant customers of ours for the last ten years. We believe we are the largest or second largest temperature-sensitive carrier for six of our top ten customers. We believe our relationships with these key customers are sound, but we are dependent upon them and the loss of some or all of their business could have a materially adverse effect on our results.

Drivers and Other Personnel

We believe that maintaining a safe and productive professional driver group is essential to providing excellent customer service and achieving profitability. As of December 31, 2018, 183 of our drivers have driven more than one million miles for us without a preventable accident, while 47 of our drivers have driven more than two million miles, 13 of our drivers have driven more than three million miles and one of our drivers has driven more than four million miles for us without a preventable accident.

We select drivers, including independent contractors, using our specific guidelines for safety records, including drivers’ Compliance, Safety, Accountability, or CSA, scores, driving experience, and personal evaluations. We maintain stringent screening, training, and testing procedures for our drivers to reduce the potential for accidents and the corresponding costs of insurance and claims. We train new drivers at a number of our terminals in all phases of our policies and operations, as well as in safety techniques and fuel-efficient operation of the equipment. All new drivers also must pass DOT required tests prior to assignment to a vehicle.

We primarily pay company-employed drivers a fixed rate per mile. The rate increases based on length of service. We also compensate drivers after one hour of detention, for inclement weather and for road service delays. Drivers also are eligible for bonuses based upon safe, efficient driving. We pay independent contractors a fixed rate per mile. Independent contractors pay for their own fuel, insurance, maintenance, and repairs.

Competition in the trucking industry for qualified drivers is normally intense and is expected to increase. Our operations have been impacted, and from time-to-time we have experienced under-utilization and increased expense, as a result of a shortage of qualified drivers. We place a high priority on the recruitment and retention of an adequate supply of qualified drivers.

As of December 31, 2018, we had 3,589 employees. This total consists of 2,718 drivers, 304 mechanics and maintenance personnel, and 567 support personnel, which includes management and administration. As of that date, we also contracted with 46 independent contractors. None of our employees are represented by a collective bargaining unit. We consider relations with our employees to be good.

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Revenue Equipment

Our revenue equipment programs are an important part of our overall goal of profitable growth. We evaluate our equipment decisions based on factors such as initial cost, useful life, warranty terms, expected maintenance costs, fuel economy, driver comfort, customer needs, manufacturer support, and resale value. We generally operate newer, well-maintained equipment with uniform specifications to minimize our spare parts inventory, streamline our maintenance program, and simplify driver training.

As of December 31, 2018, we operated a fleet of 2,755 tractors, including 2,709 company-owned tractors and 46 tractors supplied by independent contractors. The average age of our company-owned tractor fleet at December 31, 2018 was approximately 1.7 years. In 2018, we replaced our company-owned tractors within an average of 3.7 years after purchase.

Freightliner and Kenworth manufacture most of our company-owned tractors. Maintaining a relatively new and standardized fleet allows us to operate most miles while the tractors are under warranty to minimize repair and maintenance costs. It also enhances our ability to attract drivers, increases fuel economy, and improves customer acceptance by minimizing service interruptions caused by breakdowns. We adhere to a comprehensive maintenance program during the life of our equipment. We perform most routine servicing and repairs at our terminal facilities to reduce costly on-road repairs and out-of-route trips. We do not have any agreements with tractor manufacturers pursuant to which they agree to repurchase the tractors or guarantee a residual value, and we therefore could incur losses upon disposition if resale values of used tractors decline.

The EPA adopted revised emissions control regulations, which required progressive reductions in exhaust emissions from diesel engines. The last of three stepped reductions in exhaust emissions was effective for engines manufactured in January 2010 and thereafter. Since the beginning of 2016, all of the company-owned tractors in our fleet have tractor engines that were manufactured in January 2010 or thereafter and, therefore, were required to meet the revised design requirements. Compliance with these regulations has increased the cost of new tractors as manufacturers have significantly increased new equipment prices, in part to meet the more stringent engine design requirements imposed by the EPA.

We historically have contracted with independent contractors to provide and operate a portion of our tractor fleet. Independent contractors own their own tractors and are responsible for all associated expenses, including financing costs, fuel, maintenance, insurance, and taxes. The percentage of our fleet provided by independent contractors was 1.7% at December 31, 2018, 2.2% at December 31, 2017 and 2.4% at December 31, 2016.

As of December 31, 2018, we operated a fleet of 5,347 trailers, consisting of 3,747 refrigerated trailers and 1,600 dry vans. Most of our refrigerated trailers are equipped with Thermo-King refrigeration units, air ride suspensions, and anti-lock brakes. The average age of our trailer fleet at December 31, 2018 was approximately 2.5 years. In 2018, we replaced our company-owned trailers within an average of 5.5 years after purchase.

Insurance and Claims

We self-insure for a portion of our claims exposure resulting from workers’ compensation, auto liability, general liability, cargo and property damage claims, as well as employees’ health insurance. We are responsible for our proportionate share of the legal expenses relating to such claims as well. We reserve currently for anticipated losses and expenses. We periodically evaluate and adjust our insurance and claims reserves to reflect our experience. We have $14.6 million in standby letters of credit to guarantee settlement of claims under agreements with our insurance carriers and regulatory authorities. We maintain insurance coverage for per-incident and total losses in excess of the amounts for which we self-insure up to specified policy limits with licensed insurance carriers. Insurance carriers have raised premiums for many businesses, including trucking companies, which increases our insurance and claims expense, along with other factors. We believe that our policy of self-insuring up to set limits, together with our safety and loss prevention programs, are effective means of managing insurance costs.

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Fuel

Our operations are heavily dependent upon the use of diesel fuel. The price and availability of diesel fuel can vary and are subject to political, economic, and market factors that are beyond our control. Fuel prices fluctuated dramatically and quickly at various times during the last three years. We actively manage our fuel costs by purchasing fuel in bulk in Mondovi, Wisconsin and at a number of our other maintenance facilities throughout the country and have volume purchasing arrangements with national fuel centers that allow our drivers to purchase fuel at a discount while in transit. During 2018, nearly 100% of our fuel purchases were made at these designated locations. To help further reduce fuel consumption, we have equipped our company-owned tractors with auxiliary power units since 2007. These units reduce fuel consumption by providing quiet climate control and electrical power for our drivers without idling the tractor engine. We have also invested in satellite tracking equipment for the temperature-control units on our trailers that has improved fuel usage through management of required temperature settings and run time of the units.

We further manage our exposure to changes in fuel prices through fuel surcharge programs with our customers and other measures that we have implemented. We have historically been able to pass through a significant portion of long-term increases in fuel prices and related taxes to customers in the form of fuel surcharges. These fuel surcharges, which adjust with the cost of fuel, enable us to recover a substantial portion of the higher cost of fuel as prices increase, except for non-revenue miles, out-of-route miles or fuel used while the tractor is idling. As of December 31, 2018, we had no derivative financial instruments to reduce our exposure to fuel price fluctuations.

Competition

We are one of the leading carriers operating in the temperature-sensitive segment of the truckload market, and our dry freight services are expanding. These markets are highly competitive, and we compete with many other truckload carriers of varying sizes and, to a lesser extent, with less-than-truckload carriers, railroads, and other transportation companies, many of which have more equipment, a wider range of services, and greater capital resources than we do or have other competitive advantages. We also compete with other motor carriers for the services of drivers, independent contractors, and management employees. We believe that the principal competitive factors in our business are service, freight rates, capacity, use of technology and financial stability, which positions us well to compete in these segments.

Regulation

The United States Department of Transportation, or DOT, and various state and local agencies exercise broad powers over our business, generally governing such activities as authorization to engage in motor carrier operations, safety and insurance requirements. Our company drivers and independent contractors also must comply with the safety and fitness regulations promulgated by the DOT, including those relating to drug and alcohol testing, medical and continuous training qualification and hours-of-service.

The DOT, through the Federal Motor Carrier Safety Administration, or FMCSA, imposes safety and fitness regulations on us and our drivers. In December 2010, the FMCSA introduced the Compliance, Safety, Accountability, or CSA, system to measure and evaluate the on-road safety performance of commercial carriers and individual drivers. CSA’s Motor Carrier Safety Measurement System replaced the former SafeStat system and has removed a number of drivers from the industry as carriers are less willing to hire and retain drivers with marginal ratings, which has increased competition for qualified drivers. The FMCSA issued in January 2016 a proposed Safety Fitness Determination rule that would replace the current system utilizing CSA scores. The proposed methodology would integrate on-road safety data from inspections with the results of carrier investigations and accident reports. A final rule has not yet been issued.

The FMCSA issued a regulatory rule effective in July 2013 that revised the hours-of-service requirements for drivers, which designate the length of time that drivers are allowed to drive and work. The rule retained the 11-hour driving maximum under which the industry has been operating since 2004. However, changes to the “34-hour restart” provision and required breaks effectively reduced the maximum workweek for drivers. These changes reduced on-duty non-driving time and moderately decreased industry productivity. Omnibus bills adopted in each of December 2014, December 2015 and December 2016 have suspended the additional restrictions effective in July 2013 to the “34-hour restart” provision. The restart rules are required by law to remain suspended until a comprehensive study on the impact of the rules is presented to Congress, who will determine any policy changes based on their review. This review has not yet taken place.

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In January 2011, the FMCSA issued a regulatory proposal requiring commercial carriers to track compliance with hours-of-service regulations using electronic logging devices, or ELD’s, which was vacated and sent back to the FMCSA for further analysis and review in September 2011 by the 7^th U.S. Circuit Court of Appeals. The Moving Ahead for Progress in the 21^st Century Act, or MAP-21 Act, included a provision directing the FMCSA to develop a final ELD rule in 2013, which was delayed until its issuance in December 2015. The final rule required compliance beginning in December 2017 which was strictly enforced beginning in April 2018. Our entire tractor fleet has been equipped with ELD’s since early 2011.

The EPA adopted revised emissions control regulations, which required progressive reductions in exhaust emissions from diesel engines. The last of three stepped reductions in exhaust emissions was effective for engines manufactured in January 2010 and thereafter. Since the beginning of 2016, all of the company-owned tractors in our fleet have tractor engines that were manufactured in January 2010 or thereafter and, therefore, were required to meet the revised design requirements. Compliance with these regulations has increased the cost of new tractors as manufacturers have significantly increased new equipment prices, in part to meet the more stringent engine design requirements imposed by the EPA.

We are also subject to various environmental laws and regulations dealing with the handling of hazardous materials, fuel storage tanks, air emissions from our facilities, engine idling, and discharge and retention of storm water. These regulations did not have a significant impact on our operations or financial results in 2016 through 2018.

ITEM 1A. RISK FACTORS

The following factors are important and should be considered carefully in connection with any evaluation of our business, financial condition, results of operations, prospects, or an investment in our common stock. The risks and uncertainties described below are those that we currently believe may materially affect our company or our financial results. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also impair our business operations or affect our financial results.

Our business is subject to general economic and business factors that are largely beyond our control, any of which could have a materially adverse effect on our operating results. Our business is dependent on a number of general economic and business factors that may have a materially adverse effect on our results of operations, many of which are beyond our control. These factors include excess capacity in the trucking industry, strikes or other work stoppages, and significant increases or fluctuations in interest rates, fuel taxes, fuel prices, and license and registration fees. We are affected by recessionary economic cycles and downturns in customers’ business cycles, particularly in market segments and industries where we have a significant concentration of customers. Economic conditions may adversely affect our customers and their ability to pay for our services.

It is not possible to predict the effects of actual or threatened armed conflicts or terrorist attacks, efforts to combat terrorism, military action against any foreign state, heightened security requirements, or other related events and the subsequent effects on the economy or on consumer confidence in the United States, or the impact, if any, on our future results of operations.

Instability of the credit markets and the resulting effects on the economy could have a material adverse effect on our operating results. If the credit markets and the economy weaken, our business, financial results, and results of operations could be materially and adversely affected, especially if consumer confidence declines and domestic spending decreases. We may need to incur additional indebtedness, which may include drawing on our credit facility, or issue debt securities in the future to fund working capital requirements, make investments, or for general corporate purposes. Additionally, stresses in the credit market causes uncertainty in the equity markets, which may result in volatility of the market price for our securities.

We operate in a highly competitive and fragmented industry, and numerous competitive factors could impair our ability to maintain our current profitability. We compete with many other truckload carriers that provide temperature-sensitive service and dry freight of varying sizes and, to a lesser extent, with less-than-truckload carriers, railroads and other transportation companies, many of which have more equipment, a wider range of services and greater capital resources than we do or have other competitive advantages. Many of our competitors periodically reduce their freight rates to gain business, especially during times of reduced growth rates in the economy, which may limit our ability to maintain or increase freight rates or maintain significant growth in our business. In addition, many customers reduce the number of carriers they use by selecting so-called “core carriers” as approved service providers, or conduct bids from multiple carriers for their shipping needs, and in some instances, we may not be selected as a core carrier or to provide service under such bids.

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In addition, the trend toward consolidation in the trucking industry may create other large carriers with greater financial resources and other competitive advantages relating to their size. Competition from freight logistics and brokerage companies may negatively impact our customer relationships and freight rates. Furthermore, economies of scale that may be passed on to smaller carriers by procurement aggregation providers may improve such carriers’ ability to compete with us.

If the growth in our regional operations declines, or if we expand into a market with insufficient economic activity, our results of operations could be adversely affected. We operate regional service centers which are located in a number of cities within the United States. In order to support future growth, these regional operations require the commitment of additional capital, revenue equipment and facilities along with qualified management, drivers and other personnel. Should the growth in our regional operations decline, the results of our operations could be adversely affected. It may become more difficult to identify additional cities that can support service centers, and we may expand into cities where there is insufficient economic activity, reduced capacity for growth or less driver and non-driver personnel to support our operations. We may encounter operating conditions in these new markets that materially differ from our current operations and customer relationships may be difficult to obtain at appropriate freight rates. Also, we may not be able to apply our regional operating strategy successfully in additional cities, and it might take longer than expected or require a more substantial financial commitment than anticipated to establish our operations in the additional cities.

Increased prices and restricted availability of new revenue equipment could cause our financial condition, results of operations and cash flows to suffer. We have experienced higher prices for new tractors and trailers over the past few years, primarily as a result of higher commodity prices and government regulations applicable to newly manufactured tractors and trailers. We expect to continue to pay increased prices for revenue equipment for the foreseeable future. Our business could be harmed if we are unable to continue to obtain an adequate supply of new tractors and trailers or if we have to pay increased prices for new revenue equipment.

The EPA adopted revised emissions control regulations, which required progressive reductions in exhaust emissions from diesel engines. The last of three stepped reductions in exhaust emissions was effective for engines manufactured in January 2010 and thereafter. Since the beginning of 2016, all of the company-owned tractors in our fleet have tractor engines that were manufactured in January 2010 or thereafter and, therefore, were required to meet the revised design requirements. Compliance with these regulations has increased the cost of new tractors as manufacturers have significantly increased new equipment prices, in part to meet the more stringent engine design requirements imposed by the EPA.

We have significant ongoing capital requirements that could harm our financial condition, results of operations and cash flows if we are unable to generate sufficient cash from our operations. The truckload industry is capital intensive, and our policy of operating newer equipment requires us to expend significant amounts annually. If we elect to expand our fleet in future periods, our capital needs would increase. We expect to pay for projected capital expenditures with cash flows from operations and borrowings under our revolving credit facility. If we are unable to generate sufficient cash from operations and obtain financing on favorable terms in the future, we may have to limit our growth, enter into less favorable financing arrangements, or operate our revenue equipment for longer periods, any of which could have a materially adverse effect on our profitability.

We derive a significant portion of our revenue from our major customers, the loss of one or more of which could have a materially adverse effect on our business. A significant portion of our revenue is generated from our major customers. For 2018, our top 30 customers, based on revenue, accounted for approximately 65% of our revenue; our top ten customers accounted for approximately 46% of our revenue; our top five customers accounted for approximately 37% of our revenue; our top two customers accounted for approximately 28% of our revenue; and our largest customer accounted for approximately 15% of our revenue. Generally, other than for our Dedicated operations, we enter into one-year contracts with our major customers, the majority of which do not contain any firm obligations to ship with us. We cannot ensure that, upon expiration of existing contracts, these customers will continue to use our services or that, if they do, they will continue at the same levels. Many of our customers periodically solicit bids from multiple carriers for their shipping needs, and this process may depress freight rates or result in loss of business to our competitors. Some of our customers also operate their own private trucking fleets, and they may decide to transport more of their own freight. A reduction in or termination of our services by one or more of our major customers could have a materially adverse effect on our business and operating results.

Ongoing insurance and claims expenses could significantly affect our earnings. Our future insurance and claims expense might exceed historical levels, which could reduce our earnings. We self-insure for a portion of our claims exposure resulting from workers’ compensation, auto liability, general liability, cargo and property damage claims, as well as employees’ health insurance. We also are responsible for our legal expenses relating to such claims. We reserve currently for anticipated losses and expenses. We periodically evaluate and adjust our claims reserves to reflect our experience. However, ultimate results may differ from our estimates, which could result in losses over our reserved amounts.

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We maintain insurance above the amounts for which we self-insure with licensed insurance carriers. Although we believe the aggregate insurance limits should be sufficient to cover reasonably expected claims, it is possible that one or more claims could exceed our aggregate coverage limits. Insurance carriers have raised premiums for many businesses, including trucking companies. As a result, our insurance and claims expense has increased. If these expenses increase, or if we experience a claim in excess of our coverage limits, or we experience a claim for which coverage is not provided, results of our operations and financial condition could be materially and adversely affected.

We operate in a highly regulated industry and increased costs of compliance with, or liability for violation of, existing or future regulations could have a materially adverse effect on our business. The DOT and various state and local agencies exercise broad powers over our business, generally governing such activities as authorization to engage in motor carrier operations, safety and insurance requirements. Our company drivers and independent contractors also must comply with the safety and fitness regulations promulgated by the DOT, including those relating to drug and alcohol testing, medical and continuous training qualification and hours-of-service. We also may become subject to new or more restrictive regulations relating to fuel emissions, ergonomics, or other matters affecting safety or operating methods. Other agencies, such as the EPA and the Department of Homeland Security, or DHS, also regulate our equipment, operations, and drivers. Future laws and regulations may be more stringent and require changes in our operating practices, influence the demand for transportation services, or require us to incur significant additional costs. Higher costs incurred by us or by our suppliers who pass the costs onto us through higher prices could adversely affect our results of operations.

The DOT, through the Federal Motor Carrier Safety Administration, or FMCSA, imposes safety and fitness regulations on us and our drivers. In December 2010, the FMCSA introduced the Compliance, Safety, Accountability, or CSA, system to measure and evaluate the on-road safety performance of commercial carriers and individual drivers. CSA’s Motor Carrier Safety Measurement System replaced the former SafeStat system and has removed a number of drivers from the industry as carriers are less willing to hire and retain drivers with marginal ratings, which has increased competition for qualified drivers. The FMCSA issued in January 2016 a proposed Safety Fitness Determination rule that would replace the current system utilizing CSA scores. The proposed methodology would integrate on-road safety data from inspections with the results of carrier investigations and accident reports. A final rule has not yet been issued.

The FMCSA issued a regulatory rule effective in July 2013 that revised the hours-of-service requirements for drivers, which designate the length of time that drivers are allowed to drive and work. The rule retained the 11-hour driving maximum under which the industry has been operating since 2004. However, changes to the “34-hour restart” provision and required breaks effectively reduced the maximum workweek for drivers. These changes reduced on-duty non-driving time and moderately decreased industry productivity. Omnibus bills adopted in each of December 2014, December 2015 and December 2016 have suspended the additional restrictions effective in July 2013 to the “34-hour restart” provision. The restart rules are required by law to remain suspended until a comprehensive study on the impact of the rules is presented to Congress, who will determine any policy changes based on their review. This review has not yet taken place.

In January 2011, the FMCSA issued a regulatory proposal requiring commercial carriers to track compliance with hours-of-service regulations using electronic logging devices, or ELD’s, which was vacated and sent back to the FMCSA for further analysis and review in September 2011 by the 7^th U.S. Circuit Court of Appeals. The Moving Ahead for Progress in the 21^st Century Act, or MAP-21 Act, included a provision directing the FMCSA to develop a final ELD rule in 2013, which was delayed until its issuance in December 2015. The final rule required compliance beginning in December 2017 which was strictly enforced beginning in April 2018. Our entire tractor fleet has been equipped with ELD’s since early 2011.

From time to time, various federal, state, or local taxes are increased, including taxes on fuels. We cannot predict whether, or in what form, any such increase applicable to us will be enacted, but such an increase could adversely affect our profitability.

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Increases in compensation or difficulty in attracting drivers could affect our profitability and ability to grow. The transportation industry has historically experienced substantial difficulty in attracting and retaining qualified drivers, including independent contractors. With increased competition for drivers, including the impact that regulatory changes mandated by CSA have on the number of drivers in the transportation industry, we could experience greater difficulty in attracting sufficient numbers of qualified drivers. In addition, the available pool of independent contractor drivers is smaller than it has been historically. Accordingly, we may face difficulty in attracting and retaining drivers for all of our current tractors and for those we may add. Additionally, we may face difficulty in increasing the number of our independent contractor drivers. In addition, our industry suffers from high turnover rates of drivers. Our turnover rate requires us to recruit a substantial number of drivers. Moreover, our turnover rate could increase. If we are unable to continue to attract drivers and contract with independent contractors, we could be required to continue adjusting our driver compensation package beyond the norm or let trucks sit idle. An increase in our expenses or in the number of tractors without drivers could materially and adversely affect our growth and profitability.

If demand declines for our used revenue equipment, it could result in decreased equipment sales, resale values, and gains on sales of assets. The market for used revenue equipment is subject to a number of factors, including fluctuations in demand and prices. We do not have any agreements with tractor manufacturers pursuant to which they agree to repurchase our tractors or guarantee a residual value. As such, we are sensitive to changes in used equipment prices and demand, especially with respect to tractors. Reduced demand for used equipment could result in a lower volume of sales or lower sales prices, either of which could negatively affect our gains on sales of assets.

We depend on the stability, availability and security of the technology related to our management information and communication systems, which may prove to be inadequate. We depend upon our management information and communication systems for the efficient operation of our business. Our systems are used for receiving, planning and optimizing loads, communicating with and monitoring our drivers, tractors and trailers, billing customers and financial reporting. In addition, some of our key software has been developed internally by our programmers or by adapting purchased software to our needs and this software may not be easily modified or integrated with other software and systems. Our operations are potentially vulnerable to interruption by natural disasters, power loss, telecommunications failure, terrorist attacks, internet failures, computer viruses, malware, hacking, and other events beyond our control. Although we have taken steps to prevent and mitigate service interruptions and data security threats, the operational and security risks associated with information technology systems have increased in recent years because of the complexity of the systems and the sophistication and amount of cyber attacks. Our business would be materially and adversely affected if our management information and communication systems are compromised or disrupted by a failure or security breach or if we are unable to improve, upgrade, integrate or expand our systems as we continue to execute our growth strategy.

Fluctuations in the price or availability of fuel may increase our cost of operation, which could materially and adversely affect our profitability. We require large amounts of diesel fuel to operate our tractors and to power the temperature-control units on our trailers. Fuel is one of our largest operating expenses. Fuel prices tend to fluctuate, and prices and availability of all petroleum products are subject to political, economic and market factors that are beyond our control. We depend primarily on fuel surcharges, auxiliary power units for our tractors, satellite tracking equipment for the temperature-control units on our trailers, volume purchasing arrangements with truck stop chains and bulk purchases of fuel at our terminals to control and recover our fuel expenses. There can be no assurance that we will be able to collect fuel surcharges, enter into volume purchase agreements, or execute successful hedges in the future. Additionally, we may encounter decreases in productivity that may offset or eliminate savings from auxiliary power units or satellite tracking equipment, or we may incur unexpected maintenance or other costs associated with such units. The absence of meaningful fuel price protection through these measures, fluctuations in fuel prices, or a shortage of diesel fuel, could materially and adversely affect our results of operations.

Seasonality and the impact of weather can affect our profitability. Our tractor productivity generally decreases during the winter season because inclement weather impedes operations and some shippers reduce their shipments. At the same time, operating expenses generally increase, with harsh weather creating higher accident frequency, increased claims and more equipment repairs. We can also suffer short-term impacts from weather-related events such as hurricanes, blizzards, ice-storms, and floods that could harm our results or make our results more volatile.

9

Lack of capacity, changes in equipment requirements and service instability in the railroad industry could increase our operating costs and reduce our ability to offer intermodal services, which could adversely affect our revenue, results of operations, and customer relationships. Our Intermodal segment is dependent on railroad services and their capacity to transport freight for our customers. We expect our dependence on railroads will continue to increase as we expand our Intermodal services. We compete for the availability of railroad services with other intermodal operators as well as certain industries reliant on the use of rail cars, such as oil and agricultural, whose consumption of railroad capacity has significantly fluctuated over the past several years. In most markets, rail service is limited to a few railroads or even a single railroad. Any capacity constraints, changes in equipment requirements, service problems or reduction in service by the railroads with which we have, or in the future may have, relationships is likely to increase the cost of the rail-based services we provide and reduce the reliability, timeliness, and overall attractiveness of our rail-based services, which could adversely affect our revenue, results of operations and customer relationships. For example, certain railroads are considering requiring intermodal freight to be transported primarily using containers as opposed to trailers on flat cars, which could impact how we operate our intermodal business. Furthermore, railroads are relatively free to adjust shipping rates up or down as market conditions permit. Price increases could result in higher costs to our customers and reduce or eliminate our ability to offer Intermodal services. In addition, we cannot assure you that we will be able to negotiate additional contracts with railroads to expand our capacity, add additional routes, or obtain multiple providers, which could limit our ability to provide this service.

Our operations are subject to various environmental laws and regulations, the violation of which could result in substantial fines or penalties. We are subject to various environmental laws and regulations dealing with the handling of hazardous materials, fuel storage tanks, air emissions from our vehicles and facilities, engine idling, and discharge and retention of storm water. We operate in industrial areas, where truck terminals and other industrial activities are located, and where groundwater or other forms of environmental contamination have occurred. Our operations involve the risks of fuel spillage or seepage, environmental damage, and hazardous waste disposal, among others. Although we have instituted programs to monitor and control environmental risks and promote compliance with applicable environmental laws and regulations, if we are involved in a spill or other accident involving hazardous substances or if we are found to be in violation of applicable laws or regulations, we could be subject to liabilities, including substantial fines or penalties or civil and criminal liability, any of which could have a materially adverse effect on our business and operating results.

If we are unable to retain our executive officers and key management employees, our business, financial condition and results of operations could be adversely affected. We are highly dependent upon the services of our executive officers and key management employees, including our Chief Executive Officer. Currently, we do not have employment agreements with these employees and the loss of their services for any reason could have a materially adverse effect on our operations and future profitability. We have entered into agreements with our executive officers that require us to provide compensation to them in the event of termination of their employment without cause in connection with or within a certain period of time after a “change in control” of our Company. In addition, we must continue to develop and retain a core group of managers if we are to realize our goal of expanding our operations and continuing our growth. While our Board regularly engages in succession planning for our Chief Executive Officer and executive leadership team, there is no guarantee that a candidate or plan will be successful. Although we strive to reduce the potential negative impact of any such changes, the loss of any executive officers or key management employees could result in disruptions to our operations. In addition, hiring, training, and successfully integrating replacement personnel, whether internal or external, could be time consuming, may cause additional disruptions to our operations, and may be unsuccessful, which could negatively impact our business, financial condition and results of operations.

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ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2. PROPERTIES

Our executive offices and principal terminal are located on approximately seven acres in Mondovi, Wisconsin. This facility consists of 39,000 square feet of office space and 21,000 square feet of equipment repair and maintenance space. We added additional equipment repair and maintenance facilities in 2007 and in 2009 in Mondovi, Wisconsin which consist of 15,000 square feet of space located on approximately 11 acres and 50,000 square feet of space located on approximately three acres, respectively. We operate facilities in or near the following cities at which we perform the following operating activities:

Company Locations	Owned or Leased	Office	Maintenance
Mondovi, Wisconsin	Owned	X	X
Phoenix, Arizona	Owned	X	X
Jurupa Valley, California	Owned		X
Otay Mesa, California	Owned	X
Tampa, Florida	Owned	X	X
Atlanta, Georgia	Owned	X	X
Indianapolis, Indiana	Owned	X	X
Kansas City, Kansas	Owned	X	X
Portland, Oregon	Owned	X	X
Carlisle, Pennsylvania	Owned	X	X
Memphis, Tennessee	Owned	X	X
Desoto, Texas	Owned	X	X
Laredo, Texas	Owned	X	X
Colonial Heights, Virginia	Owned	X	X
McAllen, Texas	Leased

Our Truckload, Dedicated and Brokerage segments operate out of a majority of our facilities while our Intermodal segment operates out of a small number of our locations. We believe the nature, size and location of our properties are suitable and adequate for our current business needs.

ITEM 3. LEGAL PROCEEDINGS

We are involved in ordinary routine litigation incidental to our operations. These lawsuits primarily involve claims for workers’ compensation, personal injury, or property damage incurred in the transportation of freight.

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable.

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ITEM 4A. EXECUTIVE OFFICERS OF THE REGISTRANT

Our executive officers, with their ages and the offices held as of February 18, 2019, are as follows:

Name	Age	Position
Randolph L. Marten	66	Chairman of the Board, Chief Executive Officer and Director
Timothy M. Kohl	71	President
Timothy P. Nash	67	Executive Vice President of Sales and Marketing
James J. Hinnendael	55	Executive Vice President and Chief Financial Officer
John H. Turner	57	Senior Vice President of Sales

Randolph L. Marten has been a full-time employee of ours since 1974. Mr. Marten has been a Director since October 1980, our Chairman of the Board since August 1993 and our Chief Executive Officer since January 2005. Mr. Marten also served as our President from June 1986 until June 2008, our Chief Operating Officer from June 1986 until August 1998 and as a Vice President from October 1980 to June 1986.

Timothy M. Kohl has been our President since June 2008 and joined the company in November 2007. Mr. Kohl served as Knight Transportation Inc.’s President from 2004 to 2007 and as its Secretary from 2000 to 2007. Mr. Kohl served as a director on Knight’s Board of Directors from 2001 to 2006, and he served as its Chief Financial Officer from 2000 to 2004. Mr. Kohl also served as Knight’s Vice President of Human Resources from 1996 through 1999. From 1999 through 2000, Mr. Kohl served as Vice President of Knight’s southeast region. Prior to his employment with Knight, Mr. Kohl was employed by Burlington Motor Carriers as Vice President of Human Resources. Prior to his employment with Burlington Motor Carriers, Mr. Kohl served as Vice President of Human Resources for J.B. Hunt.

Timothy P. Nash has been our Executive Vice President of Sales and Marketing since November 2000. Mr. Nash also served as our Vice President of Sales from November 1990 to November 2000 and as a Regional Sales Manager from July 1987 to November 1990. Mr. Nash served as a regional sales manager for Overland Express, Inc., a long-haul truckload carrier, from 1986 to 1987.

James J. Hinnendael has been our Executive Vice President since May 2015 and our Chief Financial Officer since January 2006 and served as our Controller from January 1992 to December 2005. Mr. Hinnendael served in various professional capacities with Ernst & Young LLP, a public accounting firm, from 1987 to December 1991. Mr. Hinnendael is a certified public accountant.

John H. Turner has been our Senior Vice President of Sales since December 2013, our Vice President of Sales from January 2007 to December 2013 and an executive officer since August 2007. He also served as our Vice President of Sales from October 2000 to February 2005, and as an executive officer from January 2002 to February 2005. Mr. Turner also served as our Director of Sales from July 1999 to October 2000 and in various professional capacities in our sales and marketing area from August 1991 to July 1999 and as our Operations Manager-West from October 1990 to August 1991. Previously, Mr. Turner served as a vice president for Naterra Land, Inc., a recreational land developer, from 2005 to 2006 and as the western fleet general manager and area sales manager for Munson Transportation, Inc., a long-haul truckload carrier, from 1986 to 1990.

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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Our common stock is listed on the NASDAQ Global Select Market under the symbol “MRTN.” On February 18, 2019, we had 134 record stockholders, and approximately 13,612 beneficial stockholders of our common stock. On July 7, 2017, we effected a five-for-three stock split of our common stock, $.01 par value, in the form of a 66 2/3% stock dividend. The following cash dividends and share amounts have been adjusted to give retroactive effect to the stock split for all periods presented.

Dividend Policy

In 2010, we announced a regular cash dividend program to our stockholders, subject to approval each quarter. Quarterly cash dividends of $0.025 per share of common stock were declared in each quarter of 2018 and totaled $5.5 million. Quarterly cash dividends of $0.015 per share of common stock were declared in each of the first two quarters of 2017 along with dividends of $0.025 per share in each of 2017’s last two quarters, which totaled $4.4 million. Quarterly cash dividends of $0.015 per share of common stock were declared in each quarter of 2016 and totaled $3.3 million. We currently expect to continue to pay quarterly cash dividends in the future. The payment of cash dividends in the future, and the amount of any such dividends, will depend upon our financial condition, results of operations, cash requirements, and certain corporate law requirements, as well as other factors deemed relevant by our Board of Directors. Our ability to pay cash dividends is currently limited by restrictions contained in our revolving credit facility, which prohibits us from paying, in any fiscal year, stock redemptions and dividends in excess of 25% of our net income from the prior fiscal year. A waiver of the 25% limitation for 2016 was obtained from the lender.

Share Repurchase Program

In 2007, our Board of Directors approved and we announced a share repurchase program to repurchase up to one million shares of our common stock either through purchases on the open market or through private transactions and in accordance with Rule 10b-18 of the Exchange Act. In 2015, our Board of Directors approved and we announced an increase in the share repurchase program, providing for the repurchase of up to $40 million, or approximately two million shares, of our common stock, which was increased by our Board of Directors to 3.3 million shares in August 2017 to reflect the five-for-three stock split effected in the form of a stock dividend on July 7, 2017. The timing and extent to which we repurchase shares depends on market conditions and other corporate considerations. The repurchase program does not have an expiration date.

We repurchased and retired 200,000 shares of common stock for $3.8 million in the fourth quarter of 2018. We did not repurchase any shares in 2017. We repurchased and retired 759,302 shares of our common stock for $7.5 million in the first quarter of 2016. As of December 31, 2018, future repurchases of up to $12.6 million, or 806,000 shares, were available in the share repurchase program.

The following table shows our share repurchase activity during the three months ended December 31, 2018:

							Maximum Dollar Amount
					Total Number of		of Shares that may
	Total Number				Shares Purchased		yet be Purchased
	of Shares		Average Price		as Part of a Publicly		Under the Program
Period	Purchased		Paid per Share		Announced Program		(in thousands)
October 1, 2018-October 31, 2018		200,000	$	18.78		200,000	$	12,556
November 1, 2018-November 30, 2018		-		-		-		12,556
December 1, 2018-December 31, 2018		-		-		-		12,556
Total		200,000	$	18.78		200,000	$	12,556

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Comparative Stock Performance 

The graph below compares the cumulative total stockholder return on our common stock with the NASDAQ Market index and the SIC code 4213 (trucking, except local) line-of-business index for the last five years. Research Data Group, Inc. prepared the line-of-business index. The graph assumes $100 is invested in our common stock, the NASDAQ Stock Market index and the line-of-business index on December 31, 2013, with reinvestment of dividends. The comparisons in the graph below are based on historical data and are not intended to forecast the possible future performance of our common stock. The information in the graph below shall be deemed “furnished” and not “filed” for purposes of Section 18 of the Exchange Act or otherwise subject to the liabilities of that section.

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ITEM 6. SELECTED FINANCIAL DATA

The following selected financial data should be read in conjunction with the consolidated financial statements and notes under Item 8 of this Form 10-K.

(Dollars in thousands, except per share amounts)	2018			2017			2016			2015			2014
FOR THE YEAR
Operating revenue	$	787,594		$	698,120		$	671,144		$	664,994		$	672,929
Operating income		70,348			56,862			58,303			61,063			51,006
Net income		55,027			90,284			33,464			35,745			29,834
Net income – excluding 2017 deferred income taxes benefit(1)		55,027			33,819			33,464			35,745			29,834
Operating ratio(2)		91.1	%		91.9	%		91.3	%		90.8	%		92.4	%
PER-SHARE DATA(3)
Basic earnings per common share	$	1.01		$	1.66		$	0.62		$	0.64		$	0.54
Basic earnings per common share – excluding 2017 deferred income taxes benefit(1)		1.01			0.62			0.62			0.64			0.54
Diluted earnings per common share		1.00			1.65			0.61			0.64			0.53
Diluted earnings per common share – excluding 2017 deferred income taxes benefit(1)		1.00			0.62			0.61			0.64			0.53
Dividends declared per common share		0.10			0.08			0.06			0.06			0.06
Book value		10.57			9.64			8.04			7.50			6.96
AT YEAR END
Total assets(4)	$	753,904		$	690,403		$	653,748		$	631,528		$	576,461
Long-term debt		—			—			7,886			37,867			24,373
Stockholders’ equity		575,954			525,500			437,338			409,421			387,926

(1) Net income and basic and diluted earnings per common share for 2017 are presented for comparative purposes excluding the $56.5 million deferred income taxes benefit recorded to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017.

(2) Represents operating expenses as a percentage of operating revenue.

(3) The amounts for December 31, 2014 through 2016 have been restated to reflect the five-for-three stock split effected in the form of a 66 2/3% stock dividend on July 7, 2017.

(4) The amount for December 31, 2014 has been restated to reflect the reclassification of current deferred income tax assets to be consistent with the current presentation upon adoption of Financial Accounting Standards Board Accounting Standards Update No. 2015-17, “Income Taxes” effective December 31, 2015.

Note We account for our revenue in accordance with Financial Accounting Standards Board Accounting Standards Codification 606, which we adopted on January 1, 2018 using the modified retrospective method. Prior years have not been restated and continue to be reported under the accounting standards in effect for those periods.

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and results of operations should be read together with the selected consolidated financial data and our consolidated financial statements and the related notes appearing elsewhere in this report. This discussion and analysis contains forward-looking statements that involve risks, uncertainties and assumptions. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of many factors, including but not limited to those under the heading “Risk Factors” beginning on page 6. We do not assume, and specifically disclaim, any obligation to update any forward-looking statement contained in this report.

Overview

We have strategically transitioned from a long-haul carrier to a multifaceted business offering a network of truck-based transportation capabilities across our five distinct business platforms – Truckload, Dedicated, Intermodal, Brokerage and MRTN de Mexico.

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 agreements with customers range from three to five years and are subject to annual rate reviews.

Generally, we are paid by the mile for our Truckload and Dedicated services. We also derive Truckload and Dedicated revenue from fuel surcharges, loading and unloading activities, equipment detention and other accessorial services. The main factors that affect our Truckload and Dedicated revenue are the rate per mile we receive from our customers, the percentage of miles for which we are compensated, the number of miles we generate with our equipment and changes in fuel prices. We monitor our revenue production primarily through average Truckload and Dedicated revenue, net of fuel surcharges, per tractor per week. We also analyze our average Truckload and Dedicated revenue, net of fuel surcharges, per total mile, non-revenue miles percentage, the miles per tractor we generate, our fuel surcharge revenue, our accessorial revenue and our other sources of operating revenue.

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. The main factors that affect our Intermodal revenue are the rate per mile and other charges we receive from our customers.

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 main factors that affect our Brokerage revenue are the rate per mile and other charges that we receive from our customers.

Operating results of our MRTN de Mexico business which offers our customers door-to-door service between the United States and Mexico with our Mexican partner carriers is reported within our Truckload and Brokerage segments.

In addition to the factors discussed above, our operating revenue is also affected by, among other things, the United States economy, inventory levels, the level of truck and rail capacity in the transportation market, a contracting driver market, severe weather conditions and specific customer demand.

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Our operating revenue increased $89.5 million, or 12.8%, from 2017 to 2018. Our operating revenue, net of fuel surcharges, increased $50.4 million, or 8.0%, compared with 2017. Truckload segment revenue, net of fuel surcharges, decreased 4.2% from 2017, primarily due to a reduction in our average number of tractors, partially offset by an increase in our average revenue per tractor. Dedicated segment revenue, net of fuel surcharges, increased 21.8% from 2017, primarily due to fleet growth driven by an increase in the number of Dedicated contracts we have with our customers. Intermodal segment revenue, net of fuel surcharges, increased 21.8% due to increases in revenue per load and in volume. Brokerage segment revenue increased 22.7% also due to increases in revenue per load and in volume in 2018. Fuel surcharge revenue increased to $106.2 million in 2018 from $67.1 million in 2017 primarily due to higher fuel prices and a shift of a portion of line haul revenue to fuel surcharge revenue which began in the first quarter of 2018 as a result of changes in a number of customer agreements. The change reduced our revenue excluding fuel surcharges by $12.9 million in 2018 and increased our fuel surcharge revenue by the same amount.

Our profitability is impacted by the variable costs of transporting freight for our customers, fixed costs, and expenses containing both fixed and variable components. The variable costs include fuel expense, driver-related expenses, such as wages, benefits, training, and recruitment, and independent contractor costs, which are recorded under purchased transportation. Expenses that have both fixed and variable components include maintenance and tire expense and our cost of insurance and claims. These expenses generally vary with the miles we travel, but also have a controllable component based on safety, fleet age, efficiency and other factors. Our main fixed costs relate to the acquisition and subsequent depreciation of long-term assets, such as revenue equipment and operating terminals. We expect our annual cost of tractor and trailer ownership will increase in future periods as a result of higher prices of new equipment, along with any increases in fleet size. Although certain factors affecting our expenses are beyond our control, we monitor them closely and attempt to anticipate changes in these factors in managing our business. For example, fuel prices have significantly fluctuated over the past several years. We manage our exposure to changes in fuel prices primarily through fuel surcharge programs with our customers, as well as through volume fuel purchasing arrangements with national fuel centers and bulk purchases of fuel at our terminals. To help further reduce fuel expense, we have installed and tightly manage the use of auxiliary power units in our tractors to provide climate control and electrical power for our drivers without idling the tractor engine, and also have improved the fuel usage in the temperature-control units on our trailers. For our Intermodal and Brokerage segments, our profitability is impacted by the percentage of revenue which is payable to the providers of the transportation services we arrange. This expense is included within purchased transportation in our consolidated statements of operations.

Our operating income improved 23.7% to $70.3 million in 2018 from $56.9 million in 2017. Our operating expenses as a percentage of operating revenue, or “operating ratio,” improved to 91.1% in 2018 from 91.9% in 2017. Operating expenses as a percentage of operating revenue, with both amounts net of fuel surcharges, improved to 89.7% in 2018 from 91.0% in the 2017. Our net income was $55.0 million, or $1.00 per diluted share, in 2018 and $90.3 million, or $1.65 per diluted share, in 2017. Earnings in 2017 include a deferred income taxes benefit of $56.5 million recorded to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017. Excluding the deferred income taxes benefit, 2018 net income improved 62.7% from 2017 earnings of $33.8 million, or $0.62 per diluted share.

Our business requires substantial, ongoing capital investments, particularly for new tractors and trailers. At December 31, 2018, we had $56.8 million of cash and cash equivalents, $576.0 million in stockholders’ equity and no long-term debt outstanding. In 2018, net cash flows provided by operating activities of $150.6 million were primarily used to purchase new revenue equipment, net of proceeds from dispositions, in the amount of $93.9 million, to acquire and upgrade regional operating facilities in the amount of $5.9 million, to pay cash dividends of $5.5 million, and to repurchase and retire 200,000 shares of our common stock for $3.8 million, resulting in a $41.0 million increase in cash and cash equivalents. We estimate that capital expenditures, net of proceeds from dispositions, will be approximately $125 million in 2019. We believe our sources of liquidity are adequate to meet our current and anticipated needs for at least the next twelve months. Based upon anticipated cash flows, existing cash and cash equivalents balances, current borrowing availability and other sources of financing we expect to be available to us, we do not anticipate any significant liquidity constraints in the foreseeable future.

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This Management’s Discussion and Analysis of Financial Condition and Results of Operations includes discussions of net income and diluted earnings per share, net of a deferred income taxes benefit; operating revenue, net of fuel surcharge revenue; Truckload, Dedicated and Intermodal revenue, net of fuel surcharge revenue; operating expenses as a percentage of operating revenue, each net of fuel surcharge revenue; and net fuel expense (fuel and fuel taxes net of fuel surcharge revenue and surcharges passed through to independent contractors, outside drayage carriers and railroads). We provide these additional disclosures because management believes these measures provide a more consistent basis for comparing results of operations from period to period. These financial measures in this report have not been determined in accordance with U.S. generally accepted accounting principles (GAAP). Pursuant to Item 10(e) of Regulation S-K, we have included the amounts necessary to reconcile these non-GAAP financial measures to the most directly comparable GAAP financial measures of net income, diluted earnings per share, operating revenue, operating expenses divided by operating revenue, and fuel and fuel taxes.

Stock Split

On July 7, 2017, we effected a five-for-three stock split of our common stock, $.01 par value, in the form of a 66 ⅔% stock dividend. Our consolidated financial statements, related notes, and other financial data contained in this report have been adjusted to give retroactive effect to the stock split for all periods presented.

Adoption of New Revenue Recognition Accounting Standard

               We account for our revenue in accordance with Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC 606, Revenue from Contracts with Customers, which we adopted on January 1, 2018 using the modified retrospective method. Prior years have not been restated and continue to be reported under the accounting standards in effect for those periods. The new revenue standard requires us to recognize revenue and related expenses within each of our four reporting segments over time, compared with our former policy in which we recorded revenue and related expenses on the date shipment of freight was completed.

Results of Operations

The following table sets forth for the years indicated certain operating statistics regarding our revenue and operations: 

	2018		2017		2016
Truckload Segment:
Revenue (in thousands)	$	375,340	$	380,210	$	375,851
Average revenue, net of fuel surcharges, per tractor per week(1)	$	3,833	$	3,514	$	3,427
Average tractors(1)		1,613		1,837		1,898
Average miles per trip		573		599		623
Total miles (in thousands)		153,514		178,760		184,281
Dedicated Segment:
Revenue (in thousands)	$	223,852	$	166,881	$	157,370
Average revenue, net of fuel surcharges, per tractor per week(1)	$	3,300	$	3,481	$	3,432
Average tractors(1)		1,088		847		819
Average miles per trip		309		297		301
Total miles (in thousands)		93,269		77,102		75,333
Intermodal Segment:
Revenue (in thousands)	$	102,025	$	80,621	$	71,490
Loads		42,425		40,196		35,947
Average tractors		88		79		76
Brokerage Segment:
Revenue (in thousands)	$	86,377	$	70,408	$	66,433
Loads		51,104		48,271		49,721

(1) Includes tractors driven by both company-employed drivers and independent contractors. Independent contractors provided 46, 60 and 68 tractors as of December 31, 2018, 2017 and 2016, respectively.

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Comparison of Year Ended December 31, 2018 to Year Ended December 31, 2017

The following table sets forth for the years indicated our operating revenue, operating income and operating ratio by segment, along with the change for each component:

							Dollar Change			Percentage Change
(Dollars in thousands)	2018			2017			2018 vs. 2017			2018 vs. 2017
Operating revenue:
Truckload revenue, net of fuel surcharge revenue	$	322,324		$	336,596		$	(14,272	)		(4.2	)%
Truckload fuel surcharge revenue		53,016			43,614			9,402			21.6
Total Truckload revenue		375,340			380,210			(4,870	)		(1.3	)
Dedicated revenue, net of fuel surcharge revenue		187,137			153,691			33,446			21.8
Dedicated fuel surcharge revenue		36,715			13,190			23,525			178.4
Total Dedicated revenue		223,852			166,881			56,971			34.1
Intermodal revenue, net of fuel surcharge revenue		85,572			70,282			15,290			21.8
Intermodal fuel surcharge revenue		16,453			10,339			6,114			59.1
Total Intermodal revenue		102,025			80,621			21,404			26.5
Brokerage revenue		86,377			70,408			15,969			22.7
Total operating revenue	$	787,594		$	698,120		$	89,474			12.8	%
Operating income:
Truckload	$	35,067		$	26,326		$	8,741			33.2	%
Dedicated		18,589			17,074			1,515			8.9
Intermodal		11,150			8,303			2,847			34.3
Brokerage		5,542			5,159			383			7.4
Total operating income	$	70,348		$	56,862		$	13,486			23.7	%
Operating ratio(1):
Truckload		90.7	%		93.1	%
Dedicated		91.7			89.8
Intermodal		89.1			89.7
Brokerage		93.6			92.7
Consolidated operating ratio		91.1	%		91.9	%

(1) Represents operating expenses as a percentage of operating revenue.

Our operating revenue increased $89.5 million, or 12.8%, to $787.6 million in 2018 from $698.1 million in 2017. Our operating revenue, net of fuel surcharges, increased $50.4 million, or 8.0%, to $681.4 million in 2018 from $631.0 million in 2017. This increase was due to a $33.4 million increase in Dedicated revenue, net of fuel surcharges, a $16.0 million increase in Brokerage revenue, and a $15.3 million increase in Intermodal revenue, net of fuel surcharges, partially offset by a $14.3 million decrease in Truckload revenue, net of fuel surcharges. Fuel surcharge revenue increased to $106.2 million in 2018 from $67.1 million in 2017 primarily due to higher fuel prices and a shift of a portion of line haul revenue to fuel surcharge revenue which began in the first quarter of 2018 as a result of changes in a number of customer agreements. The change reduced our revenue excluding fuel surcharges by $12.9 million in 2018 and increased our fuel surcharge revenue by the same amount.

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Truckload segment revenue decreased $4.9 million, or 1.3%, to $375.3 million in 2018 from $380.2 million in 2017. Truckload segment revenue, net of fuel surcharges, decreased $14.3 million, or 4.2%, to $322.3 million in 2018 from $336.6 million in 2017, primarily due to a reduction in our average number of tractors, partially offset by an increase in our average revenue per tractor. The shift from line haul revenue to fuel surcharge revenue as a result of changes in a number of customer agreements decreased our Truckload revenue excluding fuel surcharges by $2.8 million, or $32 per tractor per week, in 2018, and increased our fuel surcharge revenue by the same amount. The improvement in the operating ratio in 2018 was primarily due to the increase in our average revenue per tractor driven by increased rates with our customers.

Dedicated segment revenue increased $57.0 million, or 34.1%, to $223.9 million in 2018 from $166.9 million in 2017. Dedicated segment revenue, net of fuel surcharges, increased 21.8% primarily due to fleet growth driven by an increase in the number of Dedicated contracts we have with our customers. The shift from line haul revenue to fuel surcharge revenue as a result of changes in a number of customer agreements decreased our Dedicated revenue excluding fuel surcharges by $10.1 million, or $179 per tractor per week, in 2018, and increased our fuel surcharge revenue by the same amount. The increase in the operating ratio for our Dedicated segment was primarily due to an increase in driver wages, an increase in bonus compensation expense for our non-driver employees and increased depreciation expense.

Intermodal segment revenue increased $21.4 million, or 26.5%, to $102.0 million in 2018 from $80.6 million in 2017. Intermodal segment revenue, net of fuel surcharges, increased 21.8% from 2017 due to increases in revenue per load and in volume. The improvement in the operating ratio in 2018 was primarily due to a decrease in the amounts payable to railroads as a percentage of our revenue and increased rates with our customers.

Brokerage segment revenue increased $16.0 million, or 22.7%, to $86.4 million in 2018 from $70.4 million in 2017 due to an increase in volume and rates with our customers. The increase in the operating ratio in 2018 was primarily due to an increase in the amounts payable to carriers for transportation services which we arranged as a percentage of our Brokerage revenue.

The following table sets forth for the years indicated the dollar and percentage increase or decrease of the items in our consolidated statements of operations, and those items as a percentage of operating revenue:

	Dollar Change			Percentage Change			Percentage of Operating Revenue
(Dollars in thousands)	2018 vs. 2017			2018 vs. 2017			2018			2017
Operating revenue	$	89,474			12.8	%		100.0	%		100.0	%
Operating expenses (income):
Salaries, wages and benefits		25,956			11.5			32.0			32.4
Purchased transportation		26,262			22.2			18.4			17.0
Fuel and fuel taxes		16,243			15.4			15.4			15.1
Supplies and maintenance		(760	)		(1.8	)		5.2			6.0
Depreciation		3,465			4.1			11.2			12.2
Operating taxes and licenses		480			5.3			1.2			1.3
Insurance and claims		72			0.2			4.9			5.5
Communications and utilities		587			9.7			0.8			0.9
Gain on disposition of revenue equipment		(1,745	)		(31.7	)		(0.9	)		(0.8	)
Other		5,428			32.8			2.8			2.4
Total operating expenses		75,988			11.8			91.1			91.9
Operating income		13,486			23.7			8.9			8.1
Other		(1,070	)		(275.1	)		(0.1	)		0.1
Income before income taxes		14,556			25.8			9.0			8.1
Income taxes expense (benefit)		49,813			(147.3	)		2.0			(4.8	)
Net income	$	(35,257	)		(39.1	)%		7.0	%		12.9	%

20

Salaries, wages and benefits consist of compensation for our employees, including both driver and non-driver employees, employees’ health insurance, 401(k) plan contributions and other fringe benefits. These expenses vary depending upon the size of our Truckload, Dedicated and Intermodal tractor fleets, the ratio of company drivers to independent contractors, our efficiency, our experience with employees’ health insurance claims, changes in health care premiums and other factors. Salaries, wages and benefits expense increased $26.0 million, or 11.5%, in 2018 from 2017. The increase in salaries, wages and benefits from 2017 resulted primarily from an increase in company driver compensation expense of $11.1 million, an increase in bonus compensation expense for our non-driver employees of $5.4 million, and an increase in employees’ health insurance expense of $3.3 million due to an increase in our self-insured medical claims.

Purchased transportation consists of amounts payable to railroads and carriers for transportation services we arrange in connection with Brokerage and Intermodal operations and to independent contractor providers of revenue equipment. This category will vary depending upon the amount and rates, including fuel surcharges, we pay to third-party railroad and motor carriers, the ratio of company drivers versus independent contractors and the amount of fuel surcharges passed through to independent contractors. Purchased transportation expense increased $26.3 million in total, or 22.2%, in 2018 from 2017. Amounts payable to carriers for transportation services we arranged in our Brokerage segment increased $13.7 million to $72.3 million in 2018 from $58.6 million in 2017, primarily due to an increase in brokerage revenue. Amounts payable to railroads and drayage carriers for transportation services within our Intermodal segment increased $13.6 million to $65.0 million in 2018 from $51.5 million in 2017. This increase was due to increased intermodal revenue along with increased fuel surcharges to the railroads due to higher fuel prices. The portion of purchased transportation expense related to our independent contractors within our Truckload and Dedicated segments, including fuel surcharges, decreased $1.1 million in 2018. We expect that purchased transportation expense will increase as we grow our Intermodal and Brokerage segments.

Fuel and fuel taxes increased by $16.2 million, or 15.4%, in 2018 from 2017. Net fuel expense (fuel and fuel taxes net of fuel surcharge revenue and surcharges passed through to independent contractors, outside drayage carriers and railroads) decreased $17.4 million, or 37.2%, to $29.4 million in 2018 from $46.8 million in 2017. Fuel surcharges passed through to independent contractors, outside drayage carriers and railroads increased to $14.0 million from $8.6 million in 2017. Despite an increase in the United States Department of Energy, or DOE, national average cost of fuel to $3.18 per gallon from $2.65 per gallon in 2017, net fuel expense decreased to 4.9% of Truckload, Dedicated and Intermodal segment revenue, net of fuel surcharges, from 8.4% in 2017. The net fuel expense to revenue improved primarily due to a $12.9 million shift during 2018 of a portion of line haul revenue to fuel surcharge revenue as a result of changes in a number of customer agreements. Increases in our miles per gallon and in our revenue rate per mile in 2018 further improved this ratio. We have worked diligently to control fuel usage and costs by improving our volume purchasing arrangements and optimizing our drivers’ fuel purchases with national fuel centers, focusing on shorter lengths of haul, installing and tightly managing the use of auxiliary power units in our tractors to minimize engine idling and improving fuel usage in the temperature-control units on our trailers. Auxiliary power units, which we have installed in our company-owned tractors, provide climate control and electrical power for our drivers without idling the tractor engine.

Supplies and maintenance consist of repairs, maintenance, tires, parts, oil and engine fluids, along with load-specific expenses including loading/unloading, tolls, pallets and trailer hostling. Our supplies and maintenance expense decreased $760,000, or 1.8%, from 2017 primarily due to a decrease in our loading/unloading expense.

Depreciation relates to owned tractors, trailers, auxiliary power units, communication units, terminal facilities and other assets. The increase in depreciation was primarily due to a continued increase in the cost of revenue equipment. We expect our annual cost of tractor and trailer ownership will increase in future periods as a result of higher prices of new equipment, which will result in greater depreciation over the useful life.

Gain on disposition of revenue equipment increased to $7.2 million in 2018 from $5.5 million in 2017 primarily due to an increase in the number of trailers sold, along with an increase in our average gain for each tractor and trailer sold. Future gains or losses on dispositions of revenue equipment will be impacted by the market for used revenue equipment, which is beyond our control.

The $5.4 million increase in other operating expenses in 2018 was due in part to proceeds received in 2017 from the settlement of a lawsuit, net of 2017 legal expenses, of $1.0 million, and increased costs associated with recruiting and retaining drivers.

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As a result of the foregoing factors, our operating income improved 23.7% to $70.3 million in 2018 from $56.9 million in 2017. Our operating expenses as a percentage of operating revenue, or “operating ratio,” improved to 91.1% in 2018 from 91.9% in 2017. The operating ratio for our Truckload segment was 90.7% in 2018 and 93.1% in 2017, for our Dedicated segment was 91.7% in 2018 and 89.8% in 2017, for our Intermodal segment was 89.1% in 2018 and 89.7% in 2017, and for our Brokerage segment was 93.6% in 2018 and 92.7% in 2017. Operating expenses as a percentage of operating revenue, with both amounts net of fuel surcharges, improved to 89.7% in 2018 from 91.0% in 2017.

The increase in our non-operating income was primarily due to improved operating results in 2018 by MW Logistics, LLC, or MWL, a 45% owned affiliate.

Our effective income tax rate increased to 22.5% in 2018 from (59.9%) in 2017. We recorded a $56.5 million deferred income taxes benefit in 2017 to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017, which was enacted prior to December 31, 2017. Excluding that benefit, our effective tax rate was 40.1% in 2017, which exceeds our effective tax rate in 2018 primarily due to the reduction of the federal corporate tax rate in 2018 under the Tax Cuts and Jobs Act of 2017. The Tax Cuts and Jobs Act of 2017 makes broad and complex changes to the U.S. tax code including, but not limited to, reducing the federal corporate income tax rate as noted above and allowing bonus depreciation with full expensing of qualified property placed in service after September 27, 2017.

As a result of the factors described above, net income was $55.0 million, or $1.00 per diluted share, in 2018 and $90.3 million, or $1.65 per diluted share, in 2017. Excluding the $56.5 million deferred income taxes benefit recorded in 2017, net income in 2018 improved 62.7% from 2017 earnings of $33.8 million, or $0.62 per diluted share.  

22

Comparison of Year Ended December 31, 2017 to Year Ended December 31, 2016

The following table sets forth for the years indicated our operating revenue, operating income and operating ratio by segment, along with the change for each component:

							Dollar Change			Percentage Change
(Dollars in thousands)	2017			2016			2017 vs. 2016			2017 vs. 2016
Operating revenue:
Truckload revenue, net of fuel surcharge revenue	$	336,596		$	339,967		$	(3,371	)		(1.0	)%
Truckload fuel surcharge revenue		43,614			35,884			7,730			21.5
Total Truckload revenue		380,210			375,851			4,359			1.2
Dedicated revenue, net of fuel surcharge revenue		153,691			147,007			6,684			4.5
Dedicated fuel surcharge revenue		13,190			10,363			2,827			27.3
Total Dedicated revenue		166,881			157,370			9,511			6.0
Intermodal revenue, net of fuel surcharge revenue		70,282			64,508			5,774			9.0
Intermodal fuel surcharge revenue		10,339			6,982			3,357			48.1
Total Intermodal revenue		80,621			71,490			9,131			12.8
Brokerage revenue		70,408			66,433			3,975			6.0
Total operating revenue	$	698,120		$	671,144		$	26,976			4.0	%
Operating income:
Truckload	$	26,326		$	27,438		$	(1,112	)		(4.1	)%
Dedicated		17,074			19,550			(2,476	)		(12.7	)
Intermodal		8,303			7,131			1,172			16.4
Brokerage		5,159			4,184			975			23.3
Total operating income	$	56,862		$	58,303		$	(1,441	)		(2.5	)%
Operating ratio(1):
Truckload		93.1	%		92.7	%
Dedicated		89.8			87.6
Intermodal		89.7			90.0
Brokerage		92.7			93.7
Consolidated operating ratio		91.9	%		91.3	%

(1) Represents operating expenses as a percentage of operating revenue.

Our operating revenue increased $27.0 million, or 4.0%, to $698.1 million in 2017 from $671.1 million in 2016. Our operating revenue, net of fuel surcharges, increased $13.1 million, or 2.1%, to $631.0 million in 2017 from $617.9 million in 2016. This increase was due to a $6.7 million increase in Dedicated revenue, net of fuel surcharges, a $5.8 million increase in Intermodal revenue, net of fuel surcharges, and a $4.0 million increase in Brokerage revenue, partially offset by a $3.4 million decrease in Truckload revenue, net of fuel surcharges. Fuel surcharge revenue increased to $67.1 million in 2017 from $53.2 million in 2016 due to higher fuel prices.

Truckload segment revenue increased $4.4 million, or 1.2%, to $380.2 million in 2017 from $375.9 million in 2016. Truckload segment revenue, net of fuel surcharges, decreased $3.4 million, or 1.0%, to $336.6 million in 2017 from $340.0 million in 2016, primarily due to a reduction in our average number of tractors, partially offset by an increase in our average revenue per tractor. The increase in the operating ratio in 2017 was primarily due to an increase in insurance and claims expense, partially offset by the increase in our average revenue per tractor.

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Dedicated segment revenue increased $9.5 million, or 6.0%, to $166.9 million in 2017 from $157.4 million in 2016. Dedicated segment revenue, net of fuel surcharges, increased 4.5% primarily due to fleet growth and an increase in our average revenue per tractor. The increase in the operating ratio for our Dedicated segment was primarily due to an increase in insurance and claims expense, partially offset by the increase in our average revenue per tractor.

Intermodal segment revenue increased $9.1 million, or 12.8%, to $80.6 million in 2017 from $71.5 million in 2016. Intermodal segment revenue, net of fuel surcharges, increased 9.0% from 2016 due to an increase in volume. The operating ratio in 2017 improved slightly from 2016.

Brokerage segment revenue increased $4.0 million, or 6.0%, to $70.4 million in 2017 from $66.4 million in 2016 due to an increase in revenue per load. The improvement in the operating ratio in 2017 was achieved primarily through multiple cost control measures.

The following table sets forth for the years indicated the dollar and percentage increase or decrease of the items in our consolidated statements of operations, and those items as a percentage of operating revenue:

	Dollar Change			Percentage Change			Percentage of Operating Revenue
(Dollars in thousands)	2017 vs. 2016			2017 vs. 2016			2017			2016
Operating revenue	$	26,976			4.0	%		100.0	%		100.0	%
Operating expenses (income):
Salaries, wages and benefits		1,264			0.6			32.4			33.5
Purchased transportation		7,630			6.9			17.0			16.5
Fuel and fuel taxes		11,315			12.0			15.1			14.0
Supplies and maintenance		(2,299	)		(5.2	)		6.0			6.5
Depreciation		2,675			3.2			12.2			12.3
Operating taxes and licenses		(106	)		(1.2	)		1.3			1.4
Insurance and claims		6,362			19.7			5.5			4.8
Communications and utilities		(240	)		(3.8	)		0.9			0.9
Gain on disposition of revenue equipment		5,003			47.6			(0.8	)		(1.6	)
Other		(3,187	)		(16.1	)		2.4			2.9
Total operating expenses		28,417			4.6			91.9			91.3
Operating income		(1,441	)		(2.5	)		8.1			8.7
Other		(848	)		(68.6	)		0.1			0.2
Income before income taxes		(593	)		(1.0	)		8.1			8.5
Income taxes (benefit) expense		(57,413	)		(243.3	)		(4.8	)		3.5
Net income	$	56,820			169.8	%		12.9	%		5.0	%

Salaries, wages and benefits expense increased $1.3 million, or 0.6%, in 2017 from 2016. The increase in salaries, wages and benefits from 2016 resulted primarily from an increase in non-driver bonus compensation expense of $2.3 million, partially offset by multiple other items.

Purchased transportation expense increased $7.6 million in total, or 6.9%, in 2017 from 2016. Amounts payable to carriers for transportation services we arranged in our Brokerage segment increased $3.2 million to $58.6 million in 2017 from $55.4 million in 2016, primarily due to an increase in brokerage revenue. Amounts payable to railroads and drayage carriers for transportation services within our Intermodal segment increased $5.6 million to $51.5 million in 2017 from $45.9 million in 2016. This increase was primarily due to increased intermodal revenue. The portion of purchased transportation expense related to our independent contractors within our Truckload and Dedicated segments, including fuel surcharges, decreased $1.2 million in 2017.

24

Fuel and fuel taxes increased by $11.3 million, or 12.0%, in 2017 from 2016. Net fuel expense (fuel and fuel taxes net of fuel surcharge revenue and surcharges passed through to independent contractors, outside drayage carriers and railroads) decreased $213,000, or 0.5%, to $46.8 million in 2017 from $47.0 million in 2016. Fuel surcharges passed through to independent contractors, outside drayage carriers and railroads increased to $8.6 million from $6.2 million in 2016. Despite an increase in the DOE national average cost of fuel to $2.65 per gallon from $2.30 per gallon in 2016, net fuel expense decreased to 8.4% of Truckload, Dedicated and Intermodal segment revenue, net of fuel surcharges, from 8.5% in 2016. The net fuel expense to revenue improved in 2017 primarily due to increases in our miles per gallon and in our revenue rate per mile. We have worked diligently to control fuel usage and costs by improving our volume purchasing arrangements and optimizing our drivers’ fuel purchases with national fuel centers, focusing on shorter lengths of haul, installing and tightly managing the use of auxiliary power units in our tractors to minimize engine idling and improving fuel usage in the temperature-control units on our trailers.

Our supplies and maintenance expense decreased $2.3 million, or 5.2%, from 2016 primarily due to decreased repair costs at external facilities and a reduction in parts costs.

The increase in depreciation was primarily due to a continued increase in the cost of revenue equipment.

Insurance and claims consist of the costs of insurance premiums and accruals we make for claims within our self-insured retention amounts, primarily for personal injury, property damage, physical damage to our equipment, cargo claims and workers’ compensation claims. These expenses will vary primarily based upon the frequency and severity of our accident experience, our self-insured retention levels and the market for insurance. The $6.4 million increase in insurance and claims in 2017 was primarily due to increases in the cost of physical damage claims related to our tractors and trailers, in self-insured workers’ compensation claims, and in auto liability insurance premiums. Our significant self-insured retention exposes us to the possibility of significant fluctuations in claims expense between periods which could materially impact our financial results depending on the frequency, severity and timing of claims.

Gain on disposition of revenue equipment decreased to $5.5 million in 2017 from $10.5 million in 2016 primarily due to a decrease in the average gain for tractors and trailers within a soft equipment market.

The $3.2 million decrease in other operating expenses in 2017 was primarily due to proceeds received from the settlement of a lawsuit, net of current period legal expenses, of $1.0 million, along with multiple cost control measures.

As a result of the foregoing factors, our operating income decreased to $56.9 million in 2017 from $58.3 million in 2016. Our operating expenses as a percentage of operating revenue, or “operating ratio,” was 91.9% in 2017 and 91.3% in 2016. The operating ratio for our Truckload segment was 93.1% in 2017 and 92.7% in 2016, for our Dedicated segment was 89.8% in 2017 and 87.6% in 2016, for our Intermodal segment was 89.7% in 2017 and 90.0% in 2016, and for our Brokerage segment was 92.7% in 2017 and 93.7% in 2016. Operating expenses as a percentage of operating revenue, with both amounts net of fuel surcharges, was 91.0% in 2017 and 90.6% in 2016.

The decrease in our non-operating expense was primarily due to improved operating results in 2017 by MWL, a 45% owned affiliate.

Our effective income tax rate decreased to (59.9%) in 2017 from 41.4% in 2016. We recorded a $56.5 million deferred income taxes benefit in 2017 to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017. Excluding that benefit, the effective tax rate was 40.1% in 2017. The decrease to 40.1% was due in part to certain federal employment tax credits realized as a discrete item and an excess tax benefit of $176,000 which was recorded as a decrease to the provision for income taxes in 2017 with the adoption of the provisions of FASB Accounting Standards Update, or ASU, No. 2016-09, “Compensation – Stock Compensation: Improvements to Employee Share-Based Payment Accounting” in 2017.

As a result of the factors described above, net income increased to $90.3 million, or $1.65 per diluted share, in 2017 from $33.5 million, or $0.61 per diluted share, in 2016. Excluding the deferred income taxes benefit, 2017 net income improved 1.1% to $33.8 million, or $0.62 per diluted share, from 2016.

25

Liquidity and Capital Resources 

Our business requires substantial, ongoing capital investments, particularly for new tractors and trailers. Our primary sources of liquidity are funds provided by operations and our revolving credit facility. A portion of our tractor fleet is provided by independent contractors who own and operate their own equipment. We have no capital expenditure requirements relating to those drivers who own their tractors or obtain financing through third parties.

The table below reflects our net cash flows provided by operating activities, net cash flows used for investing activities and net cash flows used for financing activities for the years indicated.

(In thousands)	2018			2017			2016
Net cash flows provided by operating activities	$	150,623		$	121,879		$	133,801
Net cash flows used for investing activities		(101,270	)		(95,318	)		(97,290	)
Net cash flows used for financing activities		(8,381	)		(11,258	)		(36,457	)

In 2007, our Board of Directors approved and we announced a share repurchase program to repurchase up to one million shares of our common stock either through purchases on the open market or through private transactions and in accordance with Rule 10b-18 of the Exchange Act. In 2015, our Board of Directors approved and we announced an increase in the share repurchase program, providing for the repurchase of up to $40 million, or approximately two million shares, of our common stock, which was increased by our Board of Directors to 3.3 million shares in August 2017 to reflect the five-for-three stock split effected in the form of a stock dividend on July 7, 2017. The timing and extent to which we repurchase shares depends on market conditions and other corporate considerations. The repurchase program does not have an expiration date.

We repurchased and retired 200,000 shares of common stock for $3.8 million in the fourth quarter of 2018. We did not repurchase any shares in 2017. We repurchased and retired 759,302 shares of our common stock for $7.5 million in the first quarter of 2016. As of December 31, 2018, future repurchases of up to $12.6 million, or 806,000 shares, were available in the share repurchase program.

         In 2018, net cash flows provided by operating activities of $150.6 million were primarily used to purchase new revenue equipment, net of proceeds from dispositions, in the amount of $93.9 million, to acquire and upgrade regional operating facilities in the amount of $5.9 million, to pay cash dividends of $5.5 million, and to repurchase and retire 200,000 shares of our common stock for $3.8 million, resulting in a $41.0 million increase in cash and cash equivalents. In 2017, net cash flows provided by operating activities of $121.9 million were primarily used to purchase new revenue equipment, net of proceeds from dispositions, in the amount of $87.6 million, to repay, net of borrowings, $7.9 million of long-term debt, to partially construct regional operating facilities in the amount of $5.8 million, and to pay cash dividends of $4.4 million, resulting in a $15.3 million increase in cash and cash equivalents. In 2016, net cash flows provided by operating activities of $133.8 million were primarily used to purchase new revenue equipment, net of proceeds from dispositions, in the amount of $89.9 million, to partially construct regional operating facilities in the amount of $5.1 million, to repay, net of borrowings, $30.0 million of long-term debt, to repurchase and retire 759,302 shares of our common stock for $7.5 million, and to pay cash dividends of $3.3 million. Beginning in 2018, our net cash flows are increased by the new tax laws established by the Tax Cuts and Jobs Act of 2017, which reduced the federal corporate statutory income tax rate and established bonus depreciation that allows for full expensing of qualified assets.

We estimate that capital expenditures, net of proceeds from dispositions, will be approximately $125 million in 2019. Quarterly cash dividends of $0.025 per share of common stock were declared in each quarter of 2018 and totaled $5.5 million. Quarterly cash dividends of $0.015 per share of common stock were declared in each of the first two quarters of 2017 along with dividends of $0.025 per share in each of 2017’s last two quarters, which totaled $4.4 million. Quarterly cash dividends of $0.015 per share of common stock were declared in each quarter of 2016 and totaled $3.3 million. We currently expect to continue to pay quarterly cash dividends in the future. The payment of cash dividends in the future, and the amount of any such dividends, will depend upon our financial condition, results of operations, cash requirements, and certain corporate law requirements, as well as other factors deemed relevant by our Board of Directors. We believe our sources of liquidity are adequate to meet our current and anticipated needs for at least the next twelve months. Based upon anticipated cash flows, existing cash and cash equivalents balances, current borrowing availability and other sources of financing we expect to be available to us, we do not anticipate any significant liquidity constraints in the foreseeable future.

26

In August 2018, we entered into an amendment to our unsecured committed credit facility which reduces the aggregate principal amount of the facility from $40.0 million to $30.0 million and extends the term of the facility to August 2023. At December 31, 2018, there was no outstanding principal balance on the facility. As of that date, we had outstanding standby letters of credit to guarantee settlement of self-insurance claims of $14.6 million and remaining borrowing availability of $15.4 million. This facility bears interest at a variable rate based on the London Interbank Offered Rate or the lender’s Prime Rate, in each case plus/minus applicable margins.

Our credit facility prohibits us from paying, in any fiscal year, stock redemptions and dividends in excess of 25% of our net income from the prior fiscal year. A waiver of the 25% limitation for 2016 was obtained from the lender. This facility also contains restrictive covenants which, among other matters, require us to maintain compliance with cash flow leverage and fixed charge coverage ratios. We were in compliance with all covenants at December 31, 2018 and 2017.

The following is a summary of our contractual obligations as of December 31, 2018.

	Payments Due by Period
(In thousands)	2019		2020 And 2021		2022 And 2023		Thereafter		Total
Purchase obligations for revenue equipment	$	91,099	$	—	$	—	$	—	$	91,099
Operating lease obligations		318		314		40		—		672
Total	$	91,417	$	314	$	40	$	—	$	91,771

Due to uncertainty with respect to the timing of future cash flows, the obligation under our nonqualified deferred compensation plan at December 31, 2018 of 241,348 shares of Company common stock with a value of $3.9 million has been excluded from the above table.

Off-balance Sheet Arrangements

Other than standby letters of credit maintained in connection with our self-insurance programs in the amount of $14.6 million along with purchase obligations and operating leases summarized above in our summary of contractual obligations, we did not have any other material off-balance sheet arrangements at December 31, 2018.

Inflation and Fuel Costs

Most of our operating expenses are inflation-sensitive, with inflation generally producing increased costs of operations. During the past three years, the most significant effects of inflation have been on revenue equipment prices, accident claims, health insurance and employee compensation. We attempt to limit the effects of inflation through increases in freight rates and cost control efforts.

In addition to inflation, fluctuations in fuel prices can affect our profitability. We require substantial amounts of fuel to operate our tractors and power the temperature-control units on our trailers. Substantially all of our contracts with customers contain fuel surcharge provisions. Although we historically have been able to pass through a significant portion of long-term increases in fuel prices and related taxes to customers in the form of fuel surcharges and higher rates, such increases usually are not fully recovered. These fuel surcharge provisions are not effective in mitigating the fuel price increases related to non-revenue miles or fuel used while the tractor is idling.

Seasonality

Our tractor productivity generally decreases during the winter season because inclement weather impedes operations and some shippers reduce their shipments. At the same time, operating expenses generally increase, with harsh weather creating higher accident frequency, increased claims, lower fuel efficiency and more equipment repairs.

27

Critical Accounting Policies

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions about future events, and apply judgments that affect the reported amounts of assets, liabilities, revenue and expenses in our consolidated financial statements and related notes. We base our estimates, assumptions and judgments on historical experience, current trends and other factors believed to be relevant at the time our consolidated financial statements are prepared. However, because future events and their effects cannot be determined with certainty, actual results could differ from our estimates and assumptions, and such differences could be material. We believe that the following critical accounting policies affect our more significant estimates, assumptions and judgments used in the preparation of our consolidated financial statements.

Revenue Recognition. We account for our revenue in accordance with FASB ASC 606, Revenue from Contracts with Customers, which we adopted on January 1, 2018 using the modified retrospective method. The new revenue standard requires us to recognize revenue and related expenses within each of our four reporting segments over time, compared with our former policy in which we recorded revenue and related expenses on the date shipment of freight was completed.

We account for revenue of our Intermodal and Brokerage segments and revenue on freight transported by independent contractors within our Truckload and Dedicated segments on a gross basis because we are the principal service provider controlling the promised service before it is transferred to each customer. We are primarily responsible for fulfilling the promise to provide each specified service to each customer. We bear the primary risk of loss in the event of cargo claims by our customers. We also have complete control and discretion in establishing the price for each specified service. Accordingly, all such revenue billed to customers is classified as operating revenue and all corresponding payments to carriers for transportation services we arrange in connection with brokerage and intermodal activities and to independent contractor providers of revenue equipment are classified as purchased transportation expense within our consolidated statements of operations.

Accounts Receivable. We are dependent upon a limited number of customers, and, as a result, our trade accounts receivable are highly concentrated. Trade accounts receivable are recorded at the invoiced amounts, net of an allowance for doubtful accounts. Our allowance for doubtful accounts was $348,000 as of December 31, 2018 and $300,000 as of December 31, 2017. A considerable amount of judgment is required in assessing the realization of these receivables including the current creditworthiness of each customer and related aging of the past-due balances, including any billing disputes. In order to assess the collectibility of these receivables, we perform ongoing credit evaluations of our customers’ financial condition. Through these evaluations, we may become aware of a situation where a customer may not be able to meet its financial obligations due to deterioration of its financial viability, credit ratings or bankruptcy. The allowance for doubtful accounts is based on the best information available to us and is reevaluated and adjusted as additional information is received. We evaluate the allowance based on historical write-off experience, the size of the individual customer balances, past-due amounts and the overall national economy. We review the adequacy of our allowance for doubtful accounts monthly.

Property and Equipment. The transportation industry requires significant capital investments. Our net property and equipment was $588.2 million as of December 31, 2018 and $571.9 million as of December 31, 2017. Our depreciation expense was $88.6 million in 2018, $85.1 million in 2017 and $82.4 million in 2016. We compute depreciation of our property and equipment for financial reporting purposes based on the cost of each asset, reduced by its estimated salvage value, using the straight-line method over its estimated useful life. We determine and periodically evaluate our estimate of the projected salvage values and useful lives primarily by considering the market for used equipment, prior useful lives and changes in technology. We have not changed our policy regarding salvage values as a percentage of initial cost or useful lives of tractors and trailers within the last ten years. We believe that our policies and past estimates have been reasonable. Actual results could differ from these estimates. A 5% decrease in estimated salvage values would have decreased our net property and equipment as of December 31, 2018 by approximately $11.9 million, or 2.0%.

Impairment of Assets. Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future net undiscounted cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the costs to sell.

28

Insurance and Claims. We self-insure, in part, for losses relating to workers’ compensation, auto liability, general liability, cargo and property damage claims, along with employees’ health insurance with varying risk retention levels. We maintain insurance coverage for per-incident and total losses in excess of these risk retention levels in amounts we consider adequate based upon historical experience and our ongoing review. However, we could suffer a series of losses within our self-insured retention limits or losses over our policy limits, which could negatively affect our financial condition and operating results. We are responsible for the first $1.0 million on each auto liability claim and for the first $750,000 on each workers’ compensation claim. We have $14.6 million in standby letters of credit to guarantee settlement of claims under agreements with our insurance carriers and regulatory authorities. The insurance and claims accruals in our consolidated balance sheets were $28.1 million as of December 31, 2018 and $26.2 million as of December 31, 2017. We reserve currently for the estimated cost of the uninsured portion of pending claims. We periodically evaluate and adjust these reserves based on our evaluation of the nature and severity of outstanding individual claims and our estimate of future claims development based on historical development. Actual results could differ from these current estimates. In addition, to the extent that claims are litigated and not settled, jury awards are difficult to predict.

Share-based Payment Arrangement Compensation. We have granted stock options to certain employees and non-employee directors. We recognize compensation expense for all stock options net of an estimated forfeiture rate and only record compensation expense for those shares expected to vest on a straight-line basis over the requisite service period (normally the vesting period). Determining the appropriate fair value model and calculating the fair value of stock options require the input of highly subjective assumptions, including the expected life of the stock options and stock price volatility. We use the Black-Scholes model to value our stock option awards. We believe that future volatility will not materially differ from our historical volatility. Thus, we use the historical volatility of our common stock over the expected life of the award. The assumptions used in calculating the fair value of stock options represent our best estimates, but these estimates involve inherent uncertainties and the application of judgment. As a result, if factors change and we use different assumptions, stock option compensation expense could be materially different in the future.

We have also granted performance unit awards to certain employees which are subject to vesting requirements over a five-year period, primarily based on our earnings growth. The fair value of each performance unit is based on the closing market price on the date of grant. We recognize compensation expense for these awards based on the estimated number of units probable of achieving the performance and service vesting requirements of the awards, net of an estimated forfeiture rate.

Recent Accounting Pronouncements

See Note 1 of “Notes to Consolidated Financial Statements” for a full description of recent accounting pronouncements and the respective dates of adoption and effect on our results of operations and financial position.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to a variety of market risks, most importantly the effects of the price and availability of diesel fuel. We require substantial amounts of diesel fuel to operate our tractors and power the temperature-control units on our trailers. The price and availability of diesel fuel can vary, and are subject to political, economic and market factors that are beyond our control. Significant increases in diesel fuel costs could materially and adversely affect our results of operations and financial condition. Based upon our fuel consumption in 2018, a 5% increase in the average cost of diesel fuel would have increased our fuel expense by $6.0 million.

We have historically been able to pass through a significant portion of long-term increases in diesel fuel prices and related taxes to customers in the form of fuel surcharges. Fuel surcharge programs are widely accepted among our customers, though they can vary somewhat from customer-to-customer. These fuel surcharges, which adjust weekly with the cost of fuel, enable us to recover a substantial portion of the higher cost of fuel as prices increase. These fuel surcharge provisions are not effective in mitigating the fuel price increases related to non-revenue miles or fuel used while the tractor is idling. In addition, we have worked diligently to control fuel usage and costs by improving our volume purchasing arrangements and optimizing our drivers’ fuel purchases with national fuel centers, focusing on shorter lengths of haul, installing and tightly managing the use of auxiliary power units in our tractors to minimize engine idling and improving fuel usage in our trailers’ refrigeration units.

While we do not currently have any outstanding hedging instruments to mitigate this market risk, we may enter into derivatives or other financial instruments to hedge a portion of our fuel costs in the future.

29

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Management’s Annual Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining an adequate system of internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended, for Marten Transport, Ltd. and subsidiaries (the “Company”). This system is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. generally accepted accounting principles.

The Company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the Company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the Company are being made only in accordance with authorizations of management and directors of the Company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the Company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements and even when determined to be effective, can only provide reasonable assurance with respect to financial statement preparation and presentation. Also, projection of any evaluation of the effectiveness of internal control over financial reporting to future periods is subject to the risk that controls may become inadequate because of changes in conditions, or that the degree or compliance with the policies or procedures may deteriorate.

Management, with the participation of the Company’s Chairman of the Board and Chief Executive Officer and Executive Vice President and Chief Financial Officer, evaluated the effectiveness of the Company’s internal control over financial reporting as of December 31, 2018. In making this evaluation, management used the criteria established in the 2013 Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, management concluded that the Company’s internal control over financial reporting was effective as of December 31, 2018. Further, the Company’s independent registered public accounting firm, Grant Thornton LLP, has issued a report on the Company’s internal controls over financial reporting on page 31 of this Report.

March 1, 2019

30

Report of Independent Registered Public Accounting Firm

Board of Directors and Shareholders

Marten Transport, Ltd.

Opinion on internal control over financial reporting

We have audited the internal control over financial reporting of Marten Transport, Ltd. (a Delaware corporation) and subsidiaries (the “Company”) as of December 31, 2018, based on criteria established in the 2013 Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on criteria established in the 2013 Internal Control—Integrated Framework issued by COSO.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the consolidated financial statements of the Company as of and for the year ended December 31, 2018, and our report dated March 1, 2019 expressed an unqualified opinion on those financial statements.

Basis for opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and limitations of internal control over financial reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ GRANT THORNTON LLP

Minneapolis, Minnesota

March 1, 2019

31

Report of Independent Registered Public Accounting Firm

Board of Directors and Shareholders

Marten Transport, Ltd.

Opinion on the financial statements

We have audited the accompanying consolidated balance sheets of Marten Transport, Ltd. (a Delaware corporation) and subsidiaries (the “Company”) as of December 31, 2018 and 2017, the related consolidated statements of operations, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2018, and the related notes and financial statement schedule (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018, in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in the 2013 Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”), and our report dated March 1, 2019 expressed an unqualified opinion.

Basis for opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ GRANT THORNTON LLP

We have served as the Company’s auditor since 2014.

Minneapolis, Minnesota

March 1, 2019

32

MARTEN TRANSPORT, LTD.

Consolidated Balance Sheets

	December 31,
(In thousands, except share information)	2018			2017
ASSETS
Current assets:
Cash and cash equivalents	$	56,763		$	15,791
Receivables:
Trade, less allowances of $348 and $300, respectively		83,033			74,886
Other		3,808			6,131
Prepaid expenses and other		19,924			19,810
Total current assets		163,528			116,618
Property and equipment:
Revenue equipment		679,667			652,974
Buildings and land		85,578			79,881
Office equipment and other		51,185			50,793
Less accumulated depreciation		(228,200	)		(211,728	)
Net property and equipment		588,230			571,920
Other assets		2,146			1,865
	$	753,904		$	690,403
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	15,704		$	16,478
Insurance and claims accruals		28,103			26,177
Accrued liabilities		28,166			21,622
Total current liabilities		71,973			64,277
Deferred income taxes		105,977			100,626
Total liabilities		177,950			164,903
Commitments and contingencies (Note 18)
Stockholders’ equity:
Preferred stock, $.01 par value per share; 2,000,000 shares authorized; no shares issued and outstanding		—			—
Common stock, $.01 par value per share; 192,000,000 shares authorized; 54,466,691 shares at December 31, 2018, and 54,533,455 shares at December 31, 2017, issued and outstanding		545			545
Additional paid-in capital		76,814			76,413
Retained earnings		498,595			448,542
Total stockholders’ equity		575,954			525,500
	$	753,904		$	690,403

The accompanying notes are an integral part of these consolidated financial statements.

33

MARTEN TRANSPORT, LTD.

Consolidated Statements of Operations

	For the years ended December 31,
(In thousands, except per share information)	2018			2017			2016
Operating revenue	$	787,594		$	698,120		$	671,144
Operating expenses (income):
Salaries, wages and benefits		252,047			226,091			224,827
Purchased transportation		144,611			118,349			110,719
Fuel and fuel taxes		121,633			105,390			94,075
Supplies and maintenance		40,853			41,613			43,912
Depreciation		88,585			85,120			82,445
Operating taxes and licenses		9,473			8,993			9,099
Insurance and claims		38,657			38,585			32,223
Communications and utilities		6,634			6,047			6,287
Gain on disposition of revenue equipment		(7,244	)		(5,499	)		(10,502	)
Other		21,997			16,569			19,756
		717,246			641,258			612,841
Operating income		70,348			56,862			58,303
Other		(681	)		389			1,237
Income before income taxes		71,029			56,473			57,066
Income taxes expense (benefit)		16,002			(33,811	)		23,602
Net income	$	55,027		$	90,284		$	33,464
Basic earnings per common share	$	1.01		$	1.66		$	0.62
Diluted earnings per common share	$	1.00		$	1.65		$	0.61
Dividends declared per common share	$	0.10		$	0.08		$	0.06

The accompanying notes are an integral part of these consolidated financial statements.

34

MARTEN TRANSPORT, LTD.

Consolidated Statements of Stockholders’ Equity

	Common Stock						Additional			Retained			Total Stockholders’
(In thousands)	Shares			Amount			Paid-In Capital			Earnings			Equity
Balance at December 31, 2015		54,600		$	546		$	76,468		$	332,407		$	409,421
Net income		—			—			—			33,464			33,464
Repurchase and retirement of common stock		(759	)		(8	)		(7,508	)		3			(7,513	)
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards		551			6			4,413			(3	)		4,416
Tax benefits from share-based payment arrangement exercises		—			—			46			—			46
Employee taxes paid in exchange for shares withheld		—			—			(127	)		—			(127	)
Share-based payment arrangement compensation expense		—			—			883			—			883
Dividends on common stock		—			—			—			(3,252	)		(3,252	)
Balance at December 31, 2016		54,392			544			74,175			362,619			437,338
Net income		—			—			—			90,284			90,284
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards		141			1			1,089			—			1,090
Employee taxes paid in exchange for shares withheld		—			—			(47	)		—			(47	)
Share-based payment arrangement compensation expense		—			—			1,250			—			1,250
Dividends on common stock		—			—			—			(4,361	)		(4,361	)
Cash in lieu of fractional shares from stock split		—			—			(54	)		—			(54	)
Balance at December 31, 2017		54,533			545			76,413			448,542			525,500
Adoption of accounting standard (Note 2)		—			—			—			485			485
Net income		—			—			—			55,027			55,027
Repurchase and retirement of common stock		(200	)		(2	)		(3,754	)		—			(3,756	)
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards		134			2			936			—			938
Employee taxes paid in exchange for shares withheld		—			—			(104	)		—			(104	)
Share-based payment arrangement compensation expense		—			—			3,323			—			3,323
Dividends on common stock		—			—			—			(5,459	)		(5,459	)
Balance at December 31, 2018		54,467		$	545		$	76,814		$	498,595		$	575,954

The accompanying notes are an integral part of these consolidated financial statements.

35

MARTEN TRANSPORT, LTD.

Consolidated Statements of Cash Flows

	For the years ended December 31,
(In thousands)	2018			2017			2016
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES:
Operations:
Net income	$	55,027		$	90,284		$	33,464
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		88,585			85,120			82,445
Gain on disposition of revenue equipment		(7,244	)		(5,499	)		(10,502	)
Deferred income taxes		5,351			(47,228	)		13,490
Share-based payment arrangement compensation expense		3,323			1,250			883
Distribution from affiliate		227			400			-
Equity in (earnings) loss from affiliate		(493	)		271			1,018
Adoption of accounting standard (Note 2)		485			-			-
Tax benefits from share-based payment arrangement exercises		-			-			46
Changes in other current operating items:
Receivables		(8,131	)		(5,974	)		8,518
Prepaid expenses and other		(114	)		(503	)		(1,173	)
Accounts payable		1,800			11			594
Insurance and claims accruals		1,926			6,737			3,205
Accrued liabilities		9,881			(2,990	)		1,813
Net cash provided by operating activities		150,623			121,879			133,801
CASH FLOWS USED FOR INVESTING ACTIVITIES:
Revenue equipment additions		(161,160	)		(148,856	)		(154,984	)
Proceeds from revenue equipment dispositions		67,262			61,227			65,082
Buildings and land, office equipment and other additions		(7,362	)		(7,693	)		(7,369	)
Proceeds from buildings and land, office equipment and other dispositions		5			47			23
Other		(15	)		(43	)		(42	)
Net cash used for investing activities		(101,270	)		(95,318	)		(97,290	)
CASH FLOWS USED FOR FINANCING ACTIVITIES:
Borrowings under credit facility and long-term debt		-			40,831			179,687
Repayment of borrowings under credit facility and long-term debt		-			(48,717	)		(209,668	)
Dividends on common stock		(5,459	)		(4,361	)		(3,252	)
Repurchase and retirement of common stock		(3,756	)		-			(7,513	)
Issuance of common stock from share-based payment arrangement exercises		938			1,090			4,416
Employee taxes paid in exchange for shares withheld		(104	)		(47	)		(127	)
Cash in lieu of fractional shares from stock split		-			(54	)		-
Net cash used for financing activities		(8,381	)		(11,258	)		(36,457	)
NET CHANGE IN CASH AND CASH EQUIVALENTS		40,972			15,303			54
CASH AND CASH EQUIVALENTS:
Beginning of year		15,791			488			434
End of year	$	56,763		$	15,791		$	488
SUPPLEMENTAL NON-CASH DISCLOSURE:
Change in property and equipment not yet paid	$	(3,604	)	$	(1,559	)	$	4,511
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for:
Income taxes	$	9,526		$	14,355		$	31
Interest	$	50		$	151		$	214

The accompanying notes are an integral part of these consolidated financial statements.

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MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements

December 31, 2018, 2017 and 2016

1. Summary of Significant Accounting Policies

Nature of business: Marten Transport, Ltd. is a multifaceted business offering a network of truck-based transportation capabilities across our five distinct business platforms – Truckload, Dedicated, Intermodal, Brokerage and MRTN de Mexico. We are one of the leading temperature-sensitive truckload carriers in the United States, specializing in transporting and distributing food and other consumer packaged goods that require a temperature-controlled or insulated environment. Our dry freight services are expanding, with 1,600 dry vans operating as of December 31, 2018. We operate throughout the United States and into and out of Mexico and Canada.

Principles of consolidation: The accompanying consolidated financial statements include Marten Transport, Ltd. and its subsidiaries. All intercompany accounts and transactions are eliminated upon consolidation.

Cash and cash equivalents: Cash in excess of current operating requirements is invested in short-term, highly liquid investments. We consider all highly liquid investments purchased with original maturities of three months or less to be cash equivalents. We maintain our cash and cash equivalents in bank accounts which, at times, may exceed federally insured limits. We have not experienced any losses in such accounts.

Trade accounts receivable: Trade accounts receivable are recorded at the invoiced amounts, net of an allowance for doubtful accounts. A considerable amount of judgment is required in assessing the realization of these receivables including the current creditworthiness of each customer and related aging of the past-due balances, including any billing disputes. In order to assess the collectibility of these receivables, we perform ongoing credit evaluations of our customers’ financial condition. Through these evaluations, we may become aware of a situation where a customer may not be able to meet its financial obligations due to deterioration of its financial viability, credit ratings or bankruptcy. The allowance for doubtful accounts is based on the best information available to us and is reevaluated and adjusted as additional information is received. We evaluate the allowance based on historical write-off experience, the size of the individual customer balances, past-due amounts and the overall national economy. We review the adequacy of our allowance for doubtful accounts monthly. Invoice balances over 30 days after the contractual due date are considered past due per our policy and are reviewed individually for collectibility. Initial payments by new customers are monitored for compliance with contractual terms. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential recovery is considered remote.

Property and equipment: Additions and improvements to property and equipment are capitalized at cost. Maintenance and repair expenditures are charged to operations. Gains and losses on disposals of revenue equipment are included in operations as they are a normal, recurring component of our operations.

Depreciation is computed based on the cost of the asset, reduced by its estimated salvage value, using the straight-line method for financial reporting purposes. We begin depreciating assets in the month that each asset is placed in service and, therefore, is ready for its intended use, and depreciate each asset until it is taken out of service and available for sale. Accelerated methods are used for income tax reporting purposes. Following is a summary of estimated useful lives for financial reporting purposes:

	Years
Tractors		5
Trailers		7
Service and other equipment	3	-	15
Buildings and improvements	20	-	40

In 2018, we replaced our company-owned tractors within an average of 3.7 years and our trailers within an average of 5.5 years after purchase. Our useful lives for depreciating tractors is five years and for trailers is seven years, with a 25% salvage value for tractors and a 35% salvage value for trailers. These salvage values are based upon the expected market values of the equipment after five years for tractors and seven years for trailers. Depreciation expense calculated in this manner approximates the continuing declining value of the revenue equipment, and continues at a consistent straight-line rate for units held beyond the normal replacement cycle.

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Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future net undiscounted cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the costs to sell.

Tires in service: The cost of original equipment and replacement tires placed in service is capitalized. Amortization is calculated based on cost, less estimated salvage value, using the straight-line method over 24 months. Tire amortization, which is included within supplies and maintenance in our consolidated statements of operations, was $7.0 million in 2018, $7.1 million in 2017 and $6.9 million in 2016. The current portion of capitalized tires in service is included in prepaid expenses and other in the accompanying consolidated balance sheets. The long-term portion of capitalized tires in service and the estimated salvage value are included in revenue equipment in the accompanying consolidated balance sheets. The cost of recapping tires is charged to operations as incurred.

Income taxes: Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. We have reflected the necessary deferred tax assets and liabilities in the accompanying consolidated balance sheets. We believe the future tax deductions will be realized principally through future reversals of existing taxable temporary differences and future taxable income.

In the ordinary course of business there is inherent uncertainty in quantifying our income tax positions. We assess our income tax positions and record tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting dates. For those tax positions where it is more-likely-than-not that a tax benefit will be sustained, we have recorded the largest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more-likely-than-not that a tax benefit will be sustained, no tax benefit has been recognized in the financial statements. Potential accrued interest and penalties related to unrecognized tax benefits are recognized as a component of income tax expense.

Insurance and claims: We self-insure, in part, for losses relating to workers’ compensation, auto liability, general liability, cargo, and property damage claims, along with employees’ health insurance with varying risk retention levels. We are responsible for the first $1.0 million on each auto liability claim. We are also responsible for the first $750,000 on each workers’ compensation claim. We maintain insurance coverage for per-incident and total losses in excess of these risk retention levels in amounts we consider adequate based upon historical experience and our ongoing review. We reserve currently for the estimated cost of the uninsured portion of pending claims, including legal costs. These reserves are periodically evaluated and adjusted based on our evaluation of the nature and severity of outstanding individual claims and an estimate of future claims development based on historical development. Under agreements with our insurance carriers and regulatory authorities, we have $14.6 million in standby letters of credit to guarantee settlement of claims.

Revenue recognition: We account for our revenue in accordance with Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC 606, Revenue from Contracts with Customers, which we adopted on January 1, 2018 using the modified retrospective method. The new revenue standard requires us to recognize revenue and related expenses within each of our four reporting segments over time, compared with our former policy in which we recorded revenue and related expenses on the date shipment of freight was completed.

We account for revenue of our Intermodal and Brokerage segments and revenue on freight transported by independent contractors within our Truckload and Dedicated segments on a gross basis because we are the principal service provider controlling the promised service before it is transferred to each customer. We are primarily responsible for fulfilling the promise to provide each specified service to each customer. We bear the primary risk of loss in the event of cargo claims by our customers. We also have complete control and discretion in establishing the price for each specified service. Accordingly, all such revenue billed to customers is classified as operating revenue and all corresponding payments to carriers for transportation services we arrange in connection with brokerage and intermodal activities and to independent contractor providers of revenue equipment are classified as purchased transportation expense within our consolidated statements of operations. See Note 3 for more information.

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Our largest customer, Walmart, accounted for 15% of our revenue in 2018 and 12% of our trade receivables as of December 31, 2018, 19% of our revenue in 2017 and 15% of our trade receivables as of December 31, 2017 and 17% of our revenue in 2016. Our second largest customer, The Coca-Cola Company, accounted for 13% of our revenue in 2018 and 7% of our trade receivables as of December 31, 2018. During each of 2018, 2017 and 2016, approximately 99% of our revenue was generated within the United States.

Share-based payment arrangement compensation: Under our stock incentive plans, all of our employees and any subsidiary employees, as well as all of our non-employee directors, may be granted stock-based awards, including incentive and non-statutory stock options and performance unit awards. We account for share-based payment arrangements in accordance with FASB ASC 718, Compensation-Stock Compensation, which requires all share-based payments to employees and non-employee directors, including grants of employee stock options and performance unit awards, to be recognized in the income statement based on their fair values at the date of grant.

Earnings per common share: Basic earnings per common share is computed by dividing net income by the weighted average number of common shares outstanding during the year. Diluted earnings per common share is computed by dividing net income by the sum of the weighted average number of common shares outstanding plus all additional common shares that would have been outstanding if potentially dilutive common shares related to stock options and performance unit awards had been issued using the treasury stock method.

Segment reporting: We report our operating segments in accordance with accounting standards codified in FASB ASC 280, Segment Reporting. We have five current operating segments that are aggregated into four reporting segments (Truckload, Dedicated, Intermodal and Brokerage) for financial reporting purposes. See Note 3 for more information.

Use of estimates: We must make estimates and assumptions to prepare the consolidated financial statements in conformity with U.S. generally accepted accounting principles. These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities in the consolidated financial statements and the reported amount of revenue and expenses during the reporting period. These estimates are primarily related to insurance and claims accruals and depreciation. Ultimate results could differ from these estimates.

Recent accounting pronouncements: In February 2016, the FASB issued Accounting Standards Update, or ASU, No. 2016-02, “Leases” which requires organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The new guidance also requires additional disclosures related to leasing transactions. The standard is effective for the first quarter of 2019. We will adopt the standard effective January 1, 2019 under the modified retrospective approach by recognizing the cumulative effect of initially applying the standard as an increase of $1.0 million to each of our assets and liabilities in our consolidated balance sheets. We expect the impact of the adoption of the standard to be immaterial to our consolidated balance sheets, statements of operations and statements of cash flows on an ongoing basis. We will include the additional required disclosures beginning with our Form 10-Q for the first quarter of 2019.

2. Adoption of New Accounting Standard

We account for our revenue in accordance with FASB ASC 606, Revenue from Contracts with Customers, which we adopted on January 1, 2018 using the modified retrospective method. We recognized the cumulative effect of initially applying the new revenue standard as an increase of $485,000 to the opening balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The impact of the adoption of the new revenue standard will be immaterial to our net income and financial position on an ongoing basis.

The new revenue standard requires us to recognize revenue and related expenses within each of our four reporting segments over time, compared with our former policy in which we recorded revenue and related expenses on the date shipment of freight was completed.

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The cumulative effect of the changes made to our consolidated balance sheet on January 1, 2018 for the adoption of the new revenue standard was as follows:

(In thousands)	Balance at December 31, 2017		Adjustments due to ASC 606			Balance at January 1, 2018
Assets:
Prepaid expenses and other	$	19,810	$	2,445	(a)	$	22,255
Liabilities:
Accounts payable and accrued liabilities		38,100		1,960			40,060
Stockholders’ equity:
Retained earnings		448,542		485			449,027

(a) Contract assets balance at January 1, 2018.

The impact of the adoption of the new revenue standard on our consolidated statement of operations and balance sheet was as follows:

	Year Ended December 31, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments due to ASC 606			As Reported
Operating revenue	$	788,216	$	(622	)	$	787,594
Operating expenses:
Salaries, wages and benefits		252,327		(280	)		252,047
Purchased transportation		144,573		38			144,611
Fuel and fuel taxes		121,666		(33	)		121,633
Supplies and maintenance		40,832		21			40,853
Income taxes expense		16,121		(119	)		16,002
Net income		55,276		(249	)		55,027

	Balance at December 31, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments due to ASC 606			As Reported
Assets:
Prepaid expenses and other	$	18,101	$	1,823	(a)	$	19,924
Liabilities:
Accounts payable and accrued liabilities		42,283		1,587			43,870
Stockholders’ equity:
Retained earnings		498,359		236			498,595

(a) Contract assets balance at December 31, 2018.

3. Revenue and Business Segments

We account for our revenue in accordance with FASB ASC 606, Revenue from Contracts with Customers, which we adopted on January 1, 2018 using the modified retrospective method. We combine our five current operating segments into four reporting segments (Truckload, Dedicated, Intermodal and Brokerage) for financial reporting purposes. These four reporting segments are also the appropriate categories for the disaggregation of our revenue under FASB ASC 606.

We have strategically transitioned from a long-haul carrier to a multifaceted business offering a network of truck-based transportation capabilities across our five distinct business platforms – Truckload, Dedicated, Intermodal, Brokerage and MRTN de Mexico.

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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 agreements with customers range from three to five years and are subject to annual rate reviews.

Generally, we are paid by the mile for our Truckload and Dedicated services. We also derive Truckload and Dedicated revenue from fuel surcharges, loading and unloading activities, equipment detention and other accessorial services. The main factors that affect our Truckload and Dedicated revenue are the rate per mile we receive from our customers, the percentage of miles for which we are compensated, the number of miles we generate with our equipment and changes in fuel prices. We monitor our revenue production primarily through average Truckload and Dedicated revenue, net of fuel surcharges, per tractor per week. We also analyze our average Truckload and Dedicated revenue, net of fuel surcharges, per total mile, non-revenue miles percentage, the miles per tractor we generate, our fuel surcharge revenue, our accessorial revenue and our other sources of operating revenue.

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. The main factors that affect our Intermodal revenue are the rate per mile and other charges we receive from our customers.

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 United States Department of Transportation, or DOT. We retain the billing, collection and customer management responsibilities. The main factors that affect our Brokerage revenue are the rate per mile and other charges that we receive from our customers.

Operating results of our MRTN de Mexico business which offers our customers door-to-door service between the United States and Mexico with our Mexican partner carriers is reported within our Truckload and Brokerage segments.

Our customer agreements are typically for one-year terms except for our Dedicated agreements which range from three to five years with annual rate reviews. Under FASB ASC 606, the contract date for each individual load within each of our four reporting segments is generally the date that each load is tendered to and accepted by us. For each load transported within each of our four reporting segments, the entire amount of revenue to be recognized is a single performance obligation and our agreements with our customers detail the per-mile charges for line haul and fuel surcharges, along with the rates for loading and unloading, stop offs and drops, equipment detention and other accessorial services, which is the transaction price. There are no discounts that would be a material right or consideration payable to a customer. We are required to recognize revenue and related expenses over time, from load pickup to delivery, for each load within each of our four reporting segments. We base our calculation of the amount of revenue to record in each period for individual loads picking up in one period and delivering in the following period using the number of hours estimated to be incurred within each period applied to each estimated transaction price. Contract assets for this estimated revenue are classified within prepaid expenses and other within our consolidated balance sheet as of December 31, 2018. We had no impairment losses on contract assets in 2018. We bill our customers for loads after delivery is complete with standard payment terms of 30 days.

We account for revenue of our Intermodal and Brokerage segments and revenue on freight transported by independent contractors within our Truckload and Dedicated segments on a gross basis, as discussed in our revenue policy note.

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The following table sets forth for the years 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.

(Dollars in thousands)	2018		2017		2016
Operating revenue:
Truckload revenue, net of fuel surcharge revenue	$	322,324	$	336,596	$	339,967
Truckload fuel surcharge revenue		53,016		43,614		35,884
Total Truckload revenue		375,340		380,210		375,851
Dedicated revenue, net of fuel surcharge revenue		187,137		153,691		147,007
Dedicated fuel surcharge revenue		36,715		13,190		10,363
Total Dedicated revenue		223,852		166,881		157,370
Intermodal revenue, net of fuel surcharge revenue		85,572		70,282		64,508
Intermodal fuel surcharge revenue		16,453		10,339		6,982
Total Intermodal revenue		102,025		80,621		71,490
Brokerage revenue		86,377		70,408		66,433
Total operating revenue	$	787,594	$	698,120	$	671,144
Operating income:
Truckload	$	35,067	$	26,326	$	27,438
Dedicated		18,589		17,074		19,550
Intermodal		11,150		8,303		7,131
Brokerage		5,542		5,159		4,184
Total operating income	$	70,348	$	56,862	$	58,303

Truckload segment depreciation expense was $52.2 million, $57.2 million and $56.2 million, Dedicated segment depreciation expense was $29.6 million, $22.0 million and $20.6 million, Intermodal segment depreciation expense was $5.5 million, $4.6 million and $3.9 million, and Brokerage segment depreciation expense was $1.3 million, $1.3 million and $1.7 million, in 2018, 2017 and 2016, respectively.

4. Details of Consolidated Balance Sheet Accounts

Prepaid expenses and other: As of December 31, prepaid expenses and other consisted of the following:

(In thousands)	2018		2017
Tires in service	$	5,011	$	4,787
License fees		4,760		4,858
Parts and tires inventory		3,528		4,322
Insurance premiums		1,831		3,057
Contract assets		1,823		—
Other		2,971		2,786
	$	19,924	$	19,810

Accrued liabilities: As of December 31, accrued liabilities consisted of the following:

(In thousands)	2018		2017
Salaries and wages	$	9,744	$	4,171
Accrued expenses		7,091		8,212
Vacation		5,895		5,621
Accrued liability to MWL		1,222		1,765
Other		4,214		1,853
	$	28,166	$	21,622

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5. Long-Term Debt

In August 2018, we entered into an amendment to our unsecured committed credit facility which reduces the aggregate principal amount of the facility from $40.0 million to $30.0 million and extends the term of the facility to August 2023. At December 31, 2018, there was no outstanding principal balance on the facility. As of that date, we had outstanding standby letters of credit to guarantee settlement of self-insurance claims of $14.6 million and remaining borrowing availability of $15.4 million. At December 31, 2017, there was also no outstanding principal balance on the facility. As of that date, we had outstanding standby letters of credit of $12.9 million on the facility. This facility bears interest at a variable rate based on the London Interbank Offered Rate or the lender’s Prime Rate, in each case plus/minus applicable margins. The interest rate for the facility that would apply to outstanding principal balances was 3.2% at December 31, 2018.

Our credit facility prohibits us from paying, in any fiscal year, stock redemptions and dividends in excess of 25% of our net income from the prior fiscal year. A waiver of the 25% limitation for 2016 was obtained from the lender. This facility also contains restrictive covenants which, among other matters, require us to maintain compliance with cash flow leverage and fixed charge coverage ratios. We were in compliance with all covenants at December 31, 2018 and 2017.

6. Related Party Transactions

The following related party transactions occurred during the three years ended December 31, 2018;

(a)     We purchase fuel and tires and obtain related services from a company in which one of our directors is the chairman of the board, chief executive officer and the principal stockholder. We paid that company $341,000 in 2018, $328,000 in 2017 and $361,000 in 2016 for fuel, tires and related services. In addition, we paid $2.5 million in both 2018 and 2017 and $2.0 million in 2016 to tire manufacturers for tires that were provided by the same company. The same company received commissions from the tire manufacturers related to these purchases. We did not have any payables to that company as of December 31, 2018 or 2017.

(b)     We provide transportation services to MWL as described in Note 13.

7. Income Taxes

We recorded a $56.5 million deferred income taxes benefit in 2017 to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017, which was enacted prior to December 31, 2017. Excluding that benefit, the 2017 federal deferred provision was $8.0 million and the effective tax rate was 40.1%. The Tax Cuts and Jobs Act of 2017 makes broad and complex changes to the U.S. tax code including, but not limited to, reducing the federal corporate income tax rate as noted above beginning on January 1, 2018 and allowing bonus depreciation with full expensing of qualified property placed in service after September 27, 2017.

The components of the income taxes expense (benefit) consisted of the following:

(In thousands)	2018			2017			2016
Current:
Federal	$	7,575		$	12,427		$	8,987
State		3,076			990			1,125
Total current		10,651			13,417			10,112
Deferred:
Federal		5,815			(48,424	)		12,427
State		(464	)		1,196			1,063
Total deferred		5,351			(47,228	)		13,490
Total expense (benefit)	$	16,002		$	(33,811	)	$	23,602

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The federal statutory income tax rate is reconciled to the effective income tax rate as follows:

	2018			2017			2016
Federal statutory income tax rate		21	%		35	%		35	%
Per diem and other non-deductible expenses		2			4			4
Increase in taxes arising from state income taxes, net of federal income tax benefit		3			3			2
Federal tax credits		(2	)		(1	)		—
Decrease in federal deferred taxes due to decrease in statutory rate		—			(100	)		—
Other, net		(1	)		(1	)		—
Effective tax rate		23	%		(60	)%		41	%

As of December 31, the net deferred tax liability consisted of the following:

(In thousands)	2018		2017
Deferred tax assets:
Reserves and accrued liabilities	$	7,986	$	7,277
Other		2,313		1,965
		10,299		9,242
Deferred tax liabilities:
Depreciation		113,773		107,453
Prepaid expenses		2,503		2,415
		116,276		109,868
Net deferred tax liability	$	105,977	$	100,626

We have not provided a valuation allowance against deferred tax assets at December 31, 2018 or 2017. We believe the deferred tax assets will be realized principally through future reversals of existing taxable temporary differences (deferred tax liabilities) and future taxable income.

Our reserves for unrecognized tax benefits were $1.9 million as of December 31, 2018 and $407,000 as of December 31, 2017. The $1.5 million increase in the amount reserved in 2018 relates to current period tax positions and an amendment to prior periods’ open returns for a current position less the removal of the reserve relating to 2013 tax positions, as that period has now closed. The amount reserved as of December 31, 2017 was added in 2013 through 2017 relating to current period tax positions. If recognized, $1.8 million of the unrecognized tax benefits as of December 31, 2018 would favorably impact our effective tax rate. Potential interest and penalties related to unrecognized tax benefits of $12,000 and $11,000 were recognized in our financial statements as of December 31, 2018 and 2017, respectively. We do not expect the reserves for unrecognized tax benefits to change significantly within the next twelve months. The federal statute of limitations remains open for 2015 and forward. We file tax returns in numerous state jurisdictions with varying statutes of limitations.

8. Earnings per Common Share

Basic and diluted earnings per common share were computed as follows:

(In thousands, except per share amounts)	2018		2017		2016
Numerator:
Net income	$	55,027	$	90,284	$	33,464
Denominator:
Basic earnings per common share - weighted-average shares		54,590		54,492		54,177
Effect of dilutive stock options		559		358		284
Diluted earnings per common share - weighted-average shares and assumed conversions		55,149		54,850		54,461
Basic earnings per common share	$	1.01	$	1.66	$	0.62
Diluted earnings per common share	$	1.00	$	1.65	$	0.61

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Options totaling 153,500, 145,169 and 564,833 equivalent shares were outstanding but were not included in the calculation of diluted earnings per share for 2018, 2017 and 2016, respectively, because including the options in the denominator would be antidilutive, or decrease the number of weighted-average shares, due to their exercise prices exceeding the average market price of the common shares, or because inclusion of average unrecognized compensation expense in the calculation would cause the options to be antidilutive.

Unvested performance unit awards (see Note 14) totaling 1,638, 124,046 and 64,162 equivalent shares for 2018, 2017 and 2016, respectively, were considered outstanding but were not included in the calculation of diluted earnings per share because inclusion of average unrecognized compensation expense in the calculation would cause the performance units to be antidilutive.

9. Stock Split

On July 7, 2017, we effected a five-for-three stock split of our common stock, $.01 par value, in the form of a 66 ⅔% stock dividend. Our consolidated financial statements, related notes, and other financial data contained in this report have been adjusted to give retroactive effect to the stock split for all periods presented.

10. Share Repurchase Program

In 2007, our Board of Directors approved and we announced a share repurchase program to repurchase up to one million shares of our common stock either through purchases on the open market or through private transactions and in accordance with Rule 10b-18 of the Exchange Act. In 2015, our Board of Directors approved and we announced an increase in the share repurchase program, providing for the repurchase of up to $40 million, or approximately two million shares, of our common stock, which was increased by our Board of Directors to 3.3 million shares in August 2017 to reflect the five-for-three stock split effected in the form of a stock dividend on July 7, 2017. The timing and extent to which we repurchase shares depends on market conditions and other corporate considerations. The repurchase program does not have an expiration date.

We repurchased and retired 200,000 shares of our common stock for $3.8 million in the fourth quarter of 2018. We did not repurchase any shares in 2017. We repurchased and retired 759,302 shares of our common stock for $7.5 million in the first quarter of 2016. As of December 31, 2018, future repurchases of up to $12.6 million, or 806,000 shares, were available in the share repurchase program.

11. Dividends

In 2010, we announced that our Board of Directors approved a regular cash dividend program to our stockholders, subject to approval each quarter. Quarterly cash dividends of $0.025 per share of common stock were declared in each quarter of 2018 and totaled $5.5 million. Quarterly cash dividends of $0.015 per share of common stock were declared in each of the first two quarters of 2017 along with dividends of $0.025 per share in each of 2017’s last two quarters, which totaled $4.4 million. Quarterly cash dividends of $0.015 per share of common stock were declared in each quarter of 2016 and totaled $3.3 million.

12. Third Amendment to Amended and Restated Certificate of Incorporation

In May 2018, our stockholders approved our Third Amendment to Amended and Restated Certificate of Incorporation increasing the authorized number of shares of common stock, $.01 par value, from 96 million shares to 192 million shares.

13. Equity Investment

We own a 45% equity interest in MWL, a third-party provider of logistics services to the transportation industry. A non-related party owns the other 55% equity interest in MWL. We account for our ownership interest in MWL under the equity method of accounting. We received $5.5 million, $2.2 million and $1.2 million of our revenue for loads transported by our tractors and arranged by MWL in 2018, 2017 and 2016, respectively. As of December 31, 2018, we also had a trade receivable in the amount of $630,000 from MWL and an accrued liability of $1.2 million to MWL for the excess of payments by MWL’s customers into our lockbox account over the amounts drawn on the account by MWL.

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14. Employee Benefits

Equity Incentive Plans - In May 2015, our stockholders approved our 2015 Equity Incentive Plan (the “2015 Plan”). Our Board of Directors adopted the 2015 Plan in March 2015. Under our 2015 Plan, all of our employees and any subsidiary employees, as well as all of our non-employee directors, may be granted stock-based awards, including non-statutory stock options, performance unit awards and shares of common stock, of which 998,022 shares have been awarded as of December 31, 2018. Stock options expire within 7 or 10 years after the date of grant and the exercise price must be at least the fair market value of our common stock on the date of grant. Stock options issued to employees are generally exercisable beginning one year from the date of grant in cumulative amounts of 20% per year. Performance unit awards are subject to vesting requirements over a five-year period, primarily based on our earnings growth. Options exercised and performance unit award shares issued represent newly issued shares. The maximum number of shares of common stock available for issuance under the 2015 Plan is 1,333,333 shares. As of December 31, 2018, there were 568,873 shares reserved for issuance under options outstanding and 349,814 shares reserved for issuance under outstanding performance unit awards under the 2015 Plan. The 2015 Plan replaces our 2005 Stock Incentive Plan (the “2005 Plan”), which expired by its terms in May 2015.

Under the 2005 Plan, officers, directors and employees were granted non-statutory stock options and performance unit awards with similar terms to the options and awards under the 2015 Plan. As of December 31, 2018, there were 370,320 shares reserved for issuance under options outstanding, which will continue according to their terms. As of the same date, there were no shares reserved for issuance under outstanding performance unit awards under the 2005 Plan. No additional awards will be granted under the 2005 Plan. 

We use the Black-Scholes option pricing model to calculate the grant-date fair value of option awards. The fair value of service-based option awards granted was estimated as of the date of grant using the following weighted average assumptions:

	2018			2017			2016
Expected option life in years(1)		6.0			6.0			6.0
Expected stock price volatility percentage(2)		26	%		25	%		25	%
Risk-free interest rate percentage(3)		2.8	%		2.0	%		1.4	%
Expected dividend yield(4)		0.48	%		0.59	%		0.50	%
Fair value as of the date of grant	$	6.19		$	4.34		$	3.17

(1) Expected option life – We use historical employee exercise and option expiration data to estimate the expected life assumption for the Black-Scholes grant-date valuation. We believe that this historical data is currently the best estimate of the expected term of a new option. We use a weighted-average expected life for all awards.

(2) Expected stock price volatility – We use our stock’s historical volatility for the same period of time as the expected life. We have no reason to believe that its future volatility will differ from the past.

(3) Risk-free interest rate – The rate is based on the U.S. Treasury yield curve in effect at the time of the grant for the same period of time as the expected life.

(4) Expected dividend yield – The calculation is based on the total expected annual dividend payout divided by the average stock price.

Compensation costs associated with service-based option awards with graded vesting are recognized, net of an estimated forfeiture rate, on a straight-line basis over the requisite service period, which is the period between the grant date and the award’s stated vesting term. Service-based option awards become immediately exercisable in full in the event of death or disability and upon a change in control with respect to all options that have been outstanding for at least six months.

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In May 2012, we granted 98,750 performance unit awards under our 2005 Stock Incentive Plan to certain employees. This was our third grant of such awards. As of December 31, 2012 and each December 31^st thereafter through December 31, 2016, each award vested and became the right to receive a number of shares of common stock equal to a total vesting percentage multiplied by the number of units subject to such award. The total vesting percentage for each of the five years was equal to the sum of a performance vesting percentage, which was the percentage increase, if any, in our diluted net income per share for the year being measured over the prior year, and a service vesting percentage of five percentage points. All payments were made in shares of our common stock. One half of the vested performance units were paid to the employees immediately upon vesting, with the other half being credited to the employees’ accounts within the Marten Transport, Ltd. Deferred Compensation Plan, which restricts the sale of vested shares to the later of each employee’s termination of employment or attainment of age 62.

In May 2013, we granted 104,250 performance unit awards with similar terms to the awards previously granted, and which vested from December 31, 2013 through 2017.

In May 2014, we granted 60,668 performance unit awards with similar terms to the awards previously granted, and also granted 18,337 performance unit awards with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in 2014 vested from December 31, 2014 through 2018.

In May 2015, we granted 58,335 performance unit awards under our 2015 Equity Incentive Plan with similar terms to the awards previously granted, and also granted 32,500 performance unit awards with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in 2015 vest from December 31, 2015 through 2019.

In May 2016, we granted 57,669 performance unit awards under our 2015 Equity Incentive Plan with similar terms to the awards previously granted, except that the calculation of vesting shares is based on our increase in net income instead of our increase in diluted net income per share. As permitted in the performance unit award agreements granted in 2011 through 2015, the calculation of the performance vesting component beginning with the year 2015 was adjusted to be based on the increase in net income. We also granted 21,671 performance unit awards in May 2016 and 1,667 awards in August 2016 with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in 2016 vest from December 31, 2016 through 2020.

In May 2017, we granted 109,169 performance unit awards under our 2015 Equity Incentive Plan with similar terms to the awards granted in 2016, except that the service-based component was increased from five percent to ten percent per year. The Compensation Committee adjusted the equity vesting formula to better align it with our long-range growth plan. We also granted 43,342 performance unit awards in May 2017 and 2,000 awards in August 2017 with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in 2017 vest from December 31, 2017 through 2021.

In May 2018, we granted 45,700 performance unit awards under our 2015 Equity Incentive Plan with similar terms to the awards granted in 2017. We also granted 28,000 performance unit awards in May 2018 and 2,000 awards in August 2018 with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. These awards granted in 2018 vest from December 31, 2018 through 2022. We also granted 2,000 performance unit awards in December 2018 with similar terms to the awards granted in August 2018, except that the awards vest from December 31, 2019 through 2023.

The fair value of each performance unit is based on the closing market price on the date of grant. We recognize compensation expense for these awards based on the estimated number of units probable of achieving the vesting requirements of the awards, net of an estimated forfeiture rate.

The amount of share-based compensation recognized during a period is based on the value of the portion of the awards that are ultimately expected to vest. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We currently expect, based on an analysis of our historical forfeitures and known forfeitures on existing awards, that approximately 1.25% of unvested outstanding awards will be forfeited each year. This analysis will be re-evaluated quarterly and the forfeiture rate will be adjusted as necessary. Ultimately, the actual expense recognized over the vesting period will only be for those shares that vest.

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Total share-based compensation expense recorded in 2018 was $3.3 million ($2.6 million net of income tax benefit, $0.05 earnings per basic and diluted share), in 2017 was $1.3 million ($738,000 net of income tax benefit, $0.01 of earnings per basic and diluted share), and in 2016 was $883,000 ($547,000 net of income tax benefit, $0.01 of earnings per basic and diluted share). All share-based compensation expense was recorded in salaries, wages and benefits expense.

As of December 31, 2018, there was a total of $1.6 million of unrecognized compensation expense related to unvested service-based option awards, which is expected to be recognized over a weighted-average period of 3.2 years, and $2.4 million of unrecognized compensation expense related to unvested performance unit awards, which will be recorded based on the estimated number of units probable of achieving the vesting requirements of the awards through 2022.

Effective January 1, 2017, we adopted the provisions of FASB ASU No. 2016-09, “Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting” which simplifies several aspects of the accounting for share-based payment transactions. The adoption of this standard resulted in decreases to our provision for income taxes in 2018 of $319,000 and in 2017 of $176,000, as the actual increase in our stock price exceeded the grant-date fair value of the period’s exercised options and vested performance unit awards. Excess tax benefits were recognized in additional paid-in capital through 2016.

Option activity in 2018 was as follows:

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2017		918,583		$	12.02
Granted		154,500			21.26
Exercised		(105,588	)		8.91
Forfeited		(28,302	)		15.66
Outstanding at December 31, 2018		939,193		$	13.78
Exercisable at December 31, 2018		545,713		$	11.49

The 939,193 options outstanding as of December 31, 2018 have a weighted average remaining contractual life of 3.8 years and an aggregate intrinsic value based on our closing stock price on December 31, 2018 for in-the-money options of $3.0 million. The 545,713 options exercisable as of the same date have a weighted average remaining contractual life of 2.7 years and an aggregate intrinsic value similarly calculated of $2.6 million.

The fair value of options granted in 2018, 2017 and 2016 was $957,000, $592,000 and $227,000, respectively, for service-based options. The total intrinsic value of options exercised in 2018, 2017 and 2016 was $1.5 million, $830,000 and $1.9 million, respectively. Intrinsic value is the difference between the fair value of the acquired shares at the date of exercise and the exercise price, multiplied by the number of options exercised. Proceeds received from option exercises in 2018, 2017 and 2016 were $938,000, $1.1 million and $4.4 million, respectively.

Nonvested service-based option awards as of December 31, 2018 and changes during 2018 were as follows:

	Shares			Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (in Years)
Nonvested at December 31, 2017		413,228		$	3.79		5.1
Granted		154,500			6.19		6.7
Vested		(146,546	)		3.73		3.4
Forfeited		(27,702	)		4.26		5.1
Nonvested at December 31, 2018		393,480		$	4.72		5.2

The total fair value of options which vested during 2018, 2017 and 2016 was $547,000, $515,000 and $534,000, respectively.

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The following table summarizes our nonvested performance unit award activity in 2018:

	Shares				Weighted Average Grant Date Fair Value
Nonvested at December 31, 2017		322,662			$	13.32
Granted		77,700				20.31
Vested		(182,481	)	(1)		14.55
Forfeited		(31,973	)			13.81
Nonvested at December 31, 2018		185,909			$	14.89

(1) This number of performance unit award shares vested based on our financial performance in 2018 and was distributed or credited to the Marten Transport, Ltd. Deferred Compensation Plan in February 2019. As permitted in the performance unit award agreements granted in 2014 and 2015, the Compensation Committee of our Board of Directors adjusted the calculation of the performance vesting component for 2018 to be based on our increase in net income instead of our increase in diluted net income per share. Additionally, the $56.5 million deferred income taxes benefit in 2017 related to the federal Tax Cuts and Jobs Act of 2017 was excluded from the calculation of the increase in net income from 2017 to 2018. The calculation of the increase in net income also included an adjustment of 2017 net income to reflect a federal income tax rate of 21% instead of 35%, to be consistent with the federal rate in 2018.  The fair value of unit award shares that vested in 2018 was $2.7 million. 

Retirement Savings Plan - We sponsor a defined contribution retirement savings plan under Section 401(k) of the Internal Revenue Code. Employees are eligible for the plan after three months of service. Participants are able to contribute up to the limit set by law, which in 2018 was $18,500 for participants less than age 50 and $24,500 for participants age 50 and above. We contribute 35% of each participant’s contribution, up to a total of 6% contributed. Our contribution vests at the rate of 20% per year for the first through fifth years of service. In addition, we may make elective contributions as determined by the Board of Directors. No elective contributions were made in 2018, 2017 or 2016. Total expense recorded for the plan was $2.3 million in 2018 and $2.1 million in each of 2017 and 2016.

Stock Purchase Plans - An Employee Stock Purchase Plan and an Independent Contractor Stock Purchase Plan are sponsored to encourage employee and independent contractor ownership of our common stock. Eligible participants specify the amount of regular payroll or contract payment deductions and voluntary cash contributions that are used to purchase shares of our common stock. The purchases are made at the market price on the open market. We pay the broker’s commissions and administrative charges for purchases of common stock under the plans.

15. Excess Tax Benefit Reclassification

Effective January 1, 2017, we adopted the provisions of FASB ASU No. 2016-09, “Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting” which simplifies several aspects of the accounting for share-based payment transactions. This standard changed the classification of excess tax benefits in the statements of cash flows. We retrospectively reclassified $235,000 of excess tax benefits for 2016 from financing to operating activities within our 2018 and 2017 consolidated statements of cash flows.

16. Deferred Compensation Plan

In August 2010, our Board of Directors approved and adopted the Marten Transport, Ltd. Deferred Compensation Plan. The deferred compensation plan is an unfunded, nonqualified deferred compensation plan designed to allow board elected officers and other select members of our management designated by our Compensation Committee to save for retirement on a tax-deferred basis.

Under the terms of the plan, each participant is eligible to defer portions of their base pay, annual bonus, or receipt of common stock otherwise payable under a vested performance unit award. Each participant can elect a fixed distribution date for the participant’s deferral account other than certain required performance unit award deferrals credited to the discretionary account, which will be distributed after the later of the date of the participant’s termination of employment or the date the participant attains age 62. Upon termination of a participant’s employment with the company, the plan requires a lump-sum distribution of the deferral account, excluding the required performance unit award deferrals, unless the participant had elected an installment distribution. Upon a participant’s death, the plan provides that a participant’s distributions accelerate and will be paid in a lump sum to the participant’s beneficiary. We may terminate the plan and accelerate distributions to participants, but only to the extent and at the times permitted under the Internal Revenue Code. We may terminate the plan and accelerate distributions upon a change in control, which is not a payment event under the plan. In conjunction with the approval of the plan, our Board of Directors also adopted an amendment to the Marten Transport, Ltd. 2005 Stock Incentive Plan to allow for deferral of receipt of income from a performance unit award under the plan. Such deferral is also provided for within the Marten Transport, Ltd. 2015 Equity Incentive Plan. As of December 31, 2018, 241,348 shares of Company common stock with a value of $3.9 million were credited to account balances within the plan. These shares were required performance unit award deferrals of vested awards, and dividends earned on such shares.

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17. Fair Value of Financial Instruments

The carrying amounts of cash equivalents, accounts receivable and accounts payable approximate fair value because of the short maturity of these instruments.

18. Commitments and Contingencies

We are committed to purchase $91.1 million of new revenue equipment in 2019. Operating lease obligation expenditures total $672,000 through 2022.

We self-insure, in part, for losses relating to workers’ compensation, auto liability, general liability, cargo and property damage claims, along with employees’ health insurance with varying risk retention levels. We maintain insurance coverage for per-incident and total losses in excess of these risk retention levels in amounts we consider adequate based upon historical experience and our ongoing review, and reserve currently for the estimated cost of the uninsured portion of pending claims.

We are also involved in other legal actions that arise in the ordinary course of business. In the opinion of management, based upon present knowledge of the facts, it is remote that the ultimate outcome of any such legal actions will have a material adverse effect upon our long-term financial position or results of operations.

19. Quarterly Financial Data (Unaudited)

The following is a summary of the quarterly results of operations for 2018 and 2017:

2018 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	186,960	$	197,024	$	199,649	$	203,961
Operating income		13,594		18,223		18,993		19,538
Net income		10,331		13,702		15,257		15,737
Basic earnings per common share		0.19		0.25		0.28		0.29
Diluted earnings per common share		0.19		0.25		0.28		0.29

2017 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	173,159	$	171,511	$	170,679	$	182,771
Operating income		13,938		15,569		13,022		14,333
Net income		8,214		9,141		7,855		65,074
Net income – excluding deferred income taxes benefit(1)		8,214		9,141		7,855		8,609
Basic earnings per common share		0.15		0.17		0.14		1.19
Basic earnings per common share – excluding deferred income taxes benefit(1)		0.15		0.17		0.14		0.16
Diluted earnings per common share		0.15		0.17		0.14		1.18
Diluted earnings per common share – excluding deferred income taxes benefit(1)		0.15		0.17		0.14		0.16

(1) The amounts are presented for comparative purposes excluding the $56.5 million deferred income taxes benefit recorded to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017.

The sum of the diluted earnings per common share for the 2018 quarters exceeds the amount for the year, and the sum of the basic and diluted earnings per common share for the 2017 quarters is less than the amounts for the year due to differences in rounding.

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ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

As required by Rule 13a-15 under the Securities Exchange Act of 1934 (“Exchange Act”), we have carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(e)) as of the end of the period covered by this report. This evaluation was carried out under the supervision and with the participation of our management, including our Chief Executive Officer and our Executive Vice President and Chief Financial Officer. Based upon that evaluation, our Chief Executive Officer and our Executive Vice President and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of December 31, 2018. There were no changes in our internal control over financial reporting that occurred during the period covered by this report that have materially affected, or that are reasonably likely to materially affect, our internal control over financial reporting. We intend to periodically evaluate our disclosure controls and procedures as required by the Exchange Act Rules.

Changes in Internal Control Over Financial Reporting. Beginning January 1, 2018, we implemented ASC 606, Revenue from Contracts with Customers. Although the new revenue standard is expected to have an immaterial impact on our ongoing net income, we did implement changes to our processes related to revenue recognition and the control activities within them. These included the development of new policies based on the five-step model provided in the new revenue standard, new training, ongoing contract review requirements, additional estimates of revenue and related expenses for loads in progress at period-ends, and gathering of information provided in disclosures. 

We have included Management’s Annual Report on Internal Control Over Financial Reporting in Item 8 above.

ITEM 9B. OTHER INFORMATION

None.

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PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

A.            Directors of the Registrant.

The information in the “Election of Directors--Information About Nominees” and “Election of Directors--Other Information About Nominees” sections of our 2019 Proxy Statement is incorporated in this Report by reference.

B.            Executive Officers of the Registrant.

Information about our executive officers is included in this Report under Item 4A, “Executive Officers of the Registrant.”

C.            Compliance with Section 16(a) of the Exchange Act.

The information in the “Section 16(a) Beneficial Ownership Reporting Compliance” section of our 2019 Proxy Statement is incorporated in this Report by reference.

D.            Procedure for Director Nominations by Security Holders.

There have been no material changes to the procedures by which security holders may recommend nominees to our board of directors.

E.            Audit Committee Financial Expert.

The information in the “Election of Directors—Board and Board Committees” section of our 2019 Proxy Statement is incorporated in this Report by reference.

F.            Identification of the Audit Committee.

The information in the “Election of Directors—Board and Board Committees” section of our 2019 Proxy Statement is incorporated in this Report by reference.

G.            Code of Ethics for Senior Financial Management.

Our Code of Ethics for Senior Financial Management applies to all of our executive officers, including our principal executive officer, principal financial officer and controller, and meets the requirements of the Securities and Exchange Commission. We have posted our Code of Ethics for Senior Financial Management on our website at www.marten.com. We intend to disclose any amendments to and any waivers from a provision of our Code of Ethics for Senior Financial Management on our website within five business days following such amendment or waiver.

ITEM 11. EXECUTIVE COMPENSATION

The information in the “Election of Directors--Director Compensation,” “Compensation and Other Benefits” and “Compensation Discussion and Analysis” sections of our 2019 Proxy Statement is incorporated in this Report by reference.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information in the “Security Ownership of Certain Beneficial Owners and Management” and “Compensation and Other Benefits--Equity Compensation Plan Information” sections of our 2019 Proxy Statement is incorporated in this Report by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information in the “Related Party Transactions” and “Election of Directors--Board and Board Committees” sections of our 2019 Proxy Statement is incorporated in this Report by reference.

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ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information in the “Fees of Independent Auditors” section of our 2019 Proxy Statement is incorporated in this Report by reference.

PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a)	1.	Financial Statements (See Part II, Item 8 of this Report):	Page
		Management’s Annual Report on Internal Control Over Financial Reporting	30
		Reports of Independent Registered Public Accounting Firm	31
		Consolidated Balance Sheets as of December 31, 2018 and 2017	33
		Consolidated Statements of Operations for the years ended December 31, 2018, 2017 and 2016	34
		Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2018, 2017 and 2016	35
		Consolidated Statements of Cash Flows for the years ended December 31, 2018, 2017 and 2016	36
		Notes to Consolidated Financial Statements	37
	2.	Financial Statement Schedules (Consolidated Financial Statement Schedule Included in Part IV of this Report):
		Schedule II – Valuation and Qualifying Accounts and Reserves	59
		Schedules not listed above have been omitted as the required information is inapplicable or the information is presented in the consolidated financial statements or related notes.

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3.     Exhibits:

The exhibits to this Report are listed below. A copy of any of the exhibits listed will be sent at a reasonable cost to any shareholder as of March 11, 2019. Requests should be sent to James J. Hinnendael, Executive Vice President and Chief Financial Officer, at our corporate headquarters. The following exhibits are filed with or incorporated by reference into this Annual Report on Form 10-K:

Item No.	Item	Filing Method
3.1	Amended and Restated Certificate of Incorporation effective August 11, 2003	Incorporated by reference to Exhibit 4.1 of the Company’s Amendment No. 2 to Registration Statement on Form S-2 (File No. 333-107367).
3.2	Amendment to Amended and Restated Certificate of Incorporation effective May 25, 2005	Incorporated by reference to Exhibit 3.3 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2005 (File No. 0-15010).
3.3	Second Amendment to Amended and Restated Certificate of Incorporation effective June 1, 2015	Incorporated by reference to Exhibit 3.4 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 (File No. 0-15010).
3.4	Third Amendment to Amended and Restated Certificate of Incorporation effective May 18, 2018	Incorporated by reference to Exhibit 3.5 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2018 (File No. 0-15010).
3.5	Bylaws of the Company, as amended	Incorporated by reference to Exhibit 3.3 of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007 (File No. 0-15010).
4.1	Specimen form of the Company’s Common Stock Certificate	Incorporated by reference to Exhibit 4.1 of the Company’s Registration Statement on Form S-1 (File No. 33-8108). (Filed on paper – hyperlink is not required pursuant to Rule 105 of Regulation     S-T)
4.2	Amended and Restated Certificate of Incorporation effective August 11, 2003	See Exhibit 3.1 above.
4.3	Amendment to Amended and Restated Certificate of Incorporation effective May 25, 2005	See Exhibit 3.2 above.
4.4	Second Amendment to Amended and Restated Certificate of Incorporation effective June 1, 2015	See Exhibit 3.3 above.
4.5	Third Amendment to Amended and Restated Certificate of Incorporation effective May 18, 2018	See Exhibit 3.4 above.
4.6	Bylaws of the Company	See Exhibit 3.5 above.
10.1	Marten Transport, Ltd. 2005 Stock Incentive Plan	Incorporated by reference to Exhibit 10.18 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2005 (File No. 0-15010).

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Item No.	Item	Filing Method
10.2	Credit Agreement, dated as of August 31, 2006, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed September 6, 2006.
10.3	First Amendment to Credit Agreement, effective as of January 1, 2007, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed January 5, 2007.
10.4	Form of Amended and Restated Change in Control Severance Agreement	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed August 15, 2007.
10.5	Second Amendment to Credit Agreement, effective as of November 30, 2007, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders	Incorporated by reference to Exhibit 10.14 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2007 (File No. 0-15010).
10.6	Form of First Amendment to Amended and Restated Change in Control Severance Agreement	Incorporated by reference to Exhibit 10.18 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-15010).
10.7	Form of Indemnification Agreement	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed February 22, 2010.
10.8	Amendment to the Marten Transport, Ltd. 2005 Stock Incentive Plan	Incorporated by reference to Exhibit 10.17 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 (File No. 0-15010).
10.9	Marten Transport, Ltd. Deferred Compensation Plan	Incorporated by reference to Exhibit 10.18 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 (File No. 0-15010).
10.10	Form of Second Amendment to Amended and Restated Change in Control Agreement	Incorporated by Reference to Exhibit 10.2 of the Company’s Current Report on Form 8-K filed March 8, 2011.

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Item No.	Item	Filing Method
10.11	Third Amendment to Credit Agreement, dated as of May 27, 2011, by and among Marten Transport, Ltd. as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed May 31, 2011.
10.12	Executive Officer Performance Incentive Plan	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed March 5, 2012.
10.13	Fourth Amendment to Credit Agreement, dated as of December 10, 2012, between Marten Transport, Ltd. as borrower and U.S. Bank National Association	Incorporated by reference to Exhibit 10.18 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 (File No. 0-15010).
10.14	Fifth Amendment to Credit Agreement, dated as of December 22, 2014, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed December 29, 2014.
10.15	Form of Non-Statutory Stock Option Agreement for the 2015 Equity Incentive Plan	Incorporated by reference to Exhibit 10.3 of the Company’s Current Report on Form 8-K filed May 15, 2015.
10.16	Form of Performance Unit Awards Agreement for the 2015 Equity Incentive Plan	Incorporated by reference to Exhibit 10.4 of the Company’s Current Report on Form 8-K filed May 15, 2015.
10.17	Marten Transport, Ltd. 2015 Equity Incentive Plan	Incorporated by reference to Exhibit 10.21 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 (File No. 0-15010).
10.18	Sixth Amendment to Credit Agreement, dated as of November 4, 2015, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed November 6, 2015.
10.19	Amended and Restated Executive Officer Performance Incentive Plan	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed December 4, 2015.
10.20	Seventh Amendment to Credit Agreement, dated as of December 6, 2016, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed December 12, 2016.
10.21	Second Amended and Restated Executive Officer Performance Incentive Plan	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed August 18, 2017.
10.22	Named Executive Officer Compensation	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed May 11, 2018.

56

Item No.	Item	Filing Method
10.23	Eighth Amendment to Credit Agreement, dated as of August 24, 2018, by and among Marten Transport, Ltd., borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders	Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed August 28, 2018.
23.1	Consent of Grant Thornton LLP	Filed with this Report.
31.1	Certification pursuant to Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, by Randolph L. Marten, the Registrant’s Chief Executive Officer (Principal Executive Officer)	Filed with this Report.
31.2	Certification pursuant to Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, by James J. Hinnendael, the Registrant’s Executive Vice President and Chief Financial Officer (Principal Financial Officer)	Filed with this Report.
32.1	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	Filed with this Report.
101	The following financial information from Marten Transport, Ltd.’s Annual Report on Form 10-K for the period ended December 31, 2018, filed with the SEC on March 1, 2019, formatted in eXtensible Business Reporting Language (XBRL): (i) Consolidated Balance Sheets as of December 31, 2018 and December 31, 2017, (ii) Consolidated Statements of Operations for the three years ended December 31, 2018, (iii) Consolidated Statements of Stockholders’ Equity for the three years ended December 31, 2018, (iv) Consolidated Statements of Cash Flows for the three years ended December 31, 2018, and (v) Notes to Consolidated Financial Statements.	Filed with this Report.

ITEM 16:  FORM 10-K SUMMARY

None.

57

 SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, Marten Transport, Ltd., the Registrant, has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

Dated: March 1, 2019	MARTEN TRANSPORT, LTD.
	By /s/ Randolph L. Marten
	Randolph L. Marten
	Chairman of the Board and  Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below on March 1, 2019, by the following persons on behalf of the Registrant and in the capacities indicated.

Signature	Title
/s/ Randolph L. Marten	Chairman of the Board, Chief Executive Officer
Randolph L. Marten	and Director (Principal Executive Officer)
/s/ James J. Hinnendael	Executive Vice President and Chief Financial
James J. Hinnendael	Officer (Principal Financial and Accounting Officer)
/s/ Larry B. Hagness	Director
Larry B. Hagness
/s/ Thomas J. Winkel	Director
Thomas J. Winkel
/s/ Jerry M. Bauer	Director
Jerry M. Bauer
/s/ Robert L. Demorest	Director
Robert L. Demorest
/s/ G. Larry Owens	Director
G. Larry Owens
/s/ Ronald R. Booth	Director
Ronald R. Booth

58

SCHEDULE II

MARTEN TRANSPORT, LTD.

Valuation and Qualifying Accounts and Reserves
(In thousands)

	Balance at		Charged to
	Beginning of		Costs and						Balance at
Description	Year		Expenses		Deductions				End of Year
Insurance and claims accruals:
Year ended December 31, 2018	$	26,177	$	56,122	$	(54,196	)	(1)	$	28,103
Year ended December 31, 2017		19,440		53,609		(46,872	)	(1)		26,177
Year ended December 31, 2016		16,235		49,614		(46,409	)	(1)		19,440
Allowance for doubtful accounts:
Year ended December 31, 2018		300		163		(115	)	(2)		348
Year ended December 31, 2017		275		33		(8	)	(2)		300
Year ended December 31, 2016		305		88		(118	)	(2)		275

(1)	Claims payments
(2)	Write-off of bad debts, net of recoveries

See report of independent registered public accounting firm.

59

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our reports dated March 1, 2019, with respect to the consolidated financial statements and internal control over financial reporting included in the Annual Report of Marten Transport, Ltd. and subsidiaries on Form 10-K for the year ended December 31, 2018. We consent to the incorporation by reference of said reports in the Registration Statements of Marten Transport, Ltd. on Forms S-8 (File No. 333-204386, File No. 333-128168, and File No. 333-81494).

/s/ GRANT THORNTON LLP

Minneapolis, Minnesota

March 1, 2019

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Randolph L. Marten, certify that:

1. I have reviewed this annual report on Form 10-K of Marten Transport, Ltd.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: March 1, 2019	/s/ Randolph L. Marten
	Randolph L. Marten
	Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, James J. Hinnendael, certify that:

1. I have reviewed this annual report on Form 10-K of Marten Transport, Ltd.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: March 1, 2019	/s/ James J. Hinnendael
	James J. Hinnendael
	Executive Vice President and Chief Financial Officer (Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. §1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Marten Transport, Ltd. (the “Company”) on Form 10-K for the period ended December 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned certifies, pursuant to 18 U.S.C. §1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best knowledge of the undersigned:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 1, 2019	/s/ Randolph L. Marten
	Randolph L. Marten
	Chief Executive Officer
	/s/ James J. Hinnendael
	James J. Hinnendael
	Executive Vice President and Chief Financial Officer

XML

Document And Entity Information - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Feb. 18, 2019	Jun. 29, 2018
Document Information [Line Items]
Entity Registrant Name	MARTEN TRANSPORT LTD
Entity Central Index Key	0000799167
Trading Symbol	mrtn
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding (in shares)		54,469,612
Entity Public Float			$ 995,574
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Shell Company	false

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 56,763	$ 15,791
Receivables:
Trade, less allowances of $348 and $300, respectively	83,033	74,886
Other	3,808	6,131
Prepaid expenses and other	19,924	19,810
Total current assets	163,528	116,618
Property and equipment:
Less accumulated depreciation	(228,200)	(211,728)
Net property and equipment	588,230	571,920
Other assets	2,146	1,865
	753,904	690,403
Current liabilities:
Accounts payable	15,704	16,478
Insurance and claims accruals	28,103	26,177
Accrued liabilities	28,166	21,622
Total current liabilities	71,973	64,277
Deferred income taxes	105,977	100,626
Total liabilities	177,950	164,903
Commitments and contingencies (Note 18)
Stockholders’ equity:
Preferred stock, $.01 par value per share; 2,000,000 shares authorized; no shares issued and outstanding
Common stock, $.01 par value per share; 192,000,000 shares authorized; 54,466,691 shares at December 31, 2018, and 54,533,455 shares at December 31, 2017, issued and outstanding	545	545
Additional paid-in capital	76,814	76,413
Retained earnings	498,595	448,542
Total stockholders’ equity	575,954	525,500
	753,904	690,403
Revenue Equipment [Member]
Property and equipment:
Property and equipment	679,667	652,974
Land and Building [Member]
Property and equipment:
Property and equipment	85,578	79,881
Buildings And Land Office Equipment And Other [Member]
Property and equipment:
Property and equipment	$ 51,185	$ 50,793

XML

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Trade, allowance	$ 348	$ 300
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	192,000,000	96,000,000
Common stock, shares issued (in shares)	54,466,691	54,533,455
Common stock, shares outstanding (in shares)	54,466,691	54,533,455

XML

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating revenue	$ 787,594	$ 698,120	$ 671,144
Operating expenses (income):
Salaries, wages and benefits	252,047	226,091	224,827
Purchased transportation	144,611	118,349	110,719
Fuel and fuel taxes	121,633	105,390	94,075
Supplies and maintenance	40,853	41,613	43,912
Depreciation	88,585	85,120	82,445
Operating taxes and licenses	9,473	8,993	9,099
Insurance and claims	38,657	38,585	32,223
Communications and utilities	6,634	6,047	6,287
Gain on disposition of assets	(7,244)	(5,499)	(10,502)
Other	21,997	16,569	19,756
	717,246	641,258	612,841
Operating income	70,348	56,862	58,303
Other	(681)	389	1,237
Income before income taxes	71,029	56,473	57,066
Income taxes expense (benefit)	16,002	(33,811)	23,602
Net income	$ 55,027	$ 90,284	$ 33,464
Basic earnings per common share (in dollars per share)	$ 1.01	$ 1.66	$ 0.62
Diluted earnings per common share (in dollars per share)	1	1.65	0.61
Dividends declared per common share (in dollars per share)	$ 0.10	$ 0.08	$ 0.06

XML

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2015	54,600,000
Balance at Dec. 31, 2015	$ 546	$ 76,468	$ 332,407	$ 409,421
Net income			33,464	33,464
Repurchase and retirement of common stock (in shares)	(759,000)
Repurchase and retirement of common stock	$ (8)	(7,508)	3	(7,513)
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	551,000
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 6	4,413	(3)	4,416
Tax benefits from share-based payment arrangement exercises		46		46
Employee taxes paid in exchange for shares withheld		(127)		(127)
Share-based payment arrangement compensation expense		883		883
Dividends on common stock			(3,252)	(3,252)
Balance (in shares) at Dec. 31, 2016	54,392,000
Balance at Dec. 31, 2016	$ 544	74,175	362,619	437,338
Net income			90,284	$ 90,284
Repurchase and retirement of common stock (in shares)				0
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	141,000
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 1	1,089		$ 1,090
Employee taxes paid in exchange for shares withheld		(47)		(47)
Share-based payment arrangement compensation expense		1,250		1,250
Dividends on common stock			(4,361)	(4,361)
Cash in lieu of fractional shares from stock split		(54)		(54)
Balance (in shares) at Dec. 31, 2017	54,533,000
Balance at Dec. 31, 2017	$ 545	76,413	448,542	525,500
Net income			55,027	55,027
Repurchase and retirement of common stock (in shares)	(200,000)
Repurchase and retirement of common stock	$ (2)	(3,754)		(3,756)
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	134,000
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 2	936		938
Employee taxes paid in exchange for shares withheld		(104)		(104)
Share-based payment arrangement compensation expense		3,323		3,323
Dividends on common stock			(5,459)	(5,459)
Balance (in shares) at Dec. 31, 2018	54,467,000
Balance at Dec. 31, 2018	$ 545	$ 76,814	498,595	575,954
Adoption of accounting standard (Note 2)			$ 485	$ 485

XML

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES:
Net income	$ 55,027,000	$ 90,284,000	$ 33,464,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	88,585,000	85,120,000	82,445,000
Gain on disposition of assets	(7,244,000)	(5,499,000)	(10,502,000)
Deferred income taxes	5,351,000	(47,228,000)	13,490,000
Share-based payment arrangement compensation expense	3,323,000	1,250,000	883,000
Distribution from affiliate	227,000	400,000
Equity in (earnings) loss from affiliate	(493,000)	271,000	1,018,000
Adoption of accounting standard (Note 2)	485,000
Tax benefits from share-based payment arrangement exercises			46,000
Changes in other current operating items:
Receivables	(8,131,000)	(5,974,000)	8,518,000
Prepaid expenses and other	(114,000)	(503,000)	(1,173,000)
Accounts payable	1,800,000	11,000	594,000
Insurance and claims accruals	1,926,000	6,737,000	3,205,000
Accrued liabilities	9,881,000	(2,990,000)	1,813,000
Net cash provided by operating activities	150,623,000	121,879,000	133,801,000
CASH FLOWS USED FOR INVESTING ACTIVITIES:
Proceeds from revenue equipment dispositions	5,000	47,000	23,000
Proceeds from buildings and land, office equipment and other dispositions	5,000	47,000	23,000
Other	(15,000)	(43,000)	(42,000)
Net cash used for investing activities	(101,270,000)	(95,318,000)	(97,290,000)
CASH FLOWS USED FOR FINANCING ACTIVITIES:
Borrowings under credit facility and long-term debt		40,831,000	179,687,000
Repayment of borrowings under credit facility and long-term debt		(48,717,000)	(209,668,000)
Dividends on common stock	(5,459,000)	(4,361,000)	(3,252,000)
Repurchase and retirement of common stock	(3,756,000)		(7,513,000)
Issuance of common stock from share-based payment arrangement exercises	938,000	1,090,000	4,416,000
Employee taxes paid in exchange for shares withheld	(104,000)	(47,000)	(127,000)
Cash in lieu of fractional shares from stock split		(54,000)
Net cash used for financing activities	(8,381,000)	(11,258,000)	(36,457,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS	40,972,000	15,303,000	54,000
CASH AND CASH EQUIVALENTS:
Beginning of year	15,791,000	488,000	434,000
End of year	56,763,000	15,791,000	488,000
Change in property and equipment not yet paid	(3,604,000)	(1,559,000)	4,511,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Income taxes	9,526,000	14,355,000	31,000
Interest	50,000	151,000	214,000
Revenue Equipment [Member]
CASH FLOWS USED FOR INVESTING ACTIVITIES:
Revenue equipment additions	(161,160,000)	(148,856,000)	(154,984,000)
Proceeds from revenue equipment dispositions	67,262,000	61,227,000	65,082,000
Proceeds from buildings and land, office equipment and other dispositions	67,262,000	61,227,000	65,082,000
Buildings And Land Office Equipment And Other [Member]
CASH FLOWS USED FOR INVESTING ACTIVITIES:
Revenue equipment additions	$ (7,362,000)	$ (7,693,000)	$ (7,369,000)

XML

Note 1 - Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Significant Accounting Policies [Text Block]

1.

Summary of Significant Accounting Policies

Nature of business:

Marten Transport, Ltd. is a multifaceted business offering a network of truck-based transportation capabilities across our

five

distinct business platforms – Truckload, Dedicated, Intermodal, Brokerage and MRTN de Mexico. We are

one

of the leading temperature-sensitive truckload carriers in the United States, specializing in transporting and distributing food and other consumer packaged goods that require a temperature-controlled or insulated environment. Our dry freight services are expanding, with

1,600

dry vans operating as of

December 31, 2018.

We operate throughout the United States and into and out of Mexico and Canada.

Principles of consolidation:

The accompanying consolidated financial statements include Marten Transport, Ltd. and its subsidiaries. All intercompany accounts and transactions are eliminated upon consolidation.

Cash and cash equivalents:

Cash in excess of current operating requirements is invested in short-term, highly liquid investments. We consider all highly liquid investments purchased with original maturities of

three

months or less to be cash equivalents. We maintain our cash and cash equivalents in bank accounts which, at times,

may

exceed federally insured limits. We have

not

experienced any losses in such accounts.

Trade accounts receivable:

Trade accounts receivable are recorded at the invoiced amounts, net of an allowance for doubtful accounts. A considerable amount of judgment is required in assessing the realization of these receivables including the current creditworthiness of each customer and related aging of the past-due balances, including any billing disputes. In order to assess the collectibility of these receivables, we perform ongoing credit evaluations of our customers’ financial condition. Through these evaluations, we

may

become aware of a situation where a customer

may

not

be able to meet its financial obligations due to deterioration of its financial viability, credit ratings or bankruptcy. The allowance for doubtful accounts is based on the best information available to us and is reevaluated and adjusted as additional information is received. We evaluate the allowance based on historical write-off experience, the size of the individual customer balances, past-due amounts and the overall national economy. We review the adequacy of our allowance for doubtful accounts monthly. Invoice balances over

30

days after the contractual due date are considered past due per our policy and are reviewed individually for collectibility. Initial payments by new customers are monitored for compliance with contractual terms. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential recovery is considered remote.

Property and equipment:

Additions and improvements to property and equipment are capitalized at cost. Maintenance and repair expenditures are charged to operations. Gains and losses on disposals of revenue equipment are included in operations as they are a normal, recurring component of our operations.

Depreciation is computed based on the cost of the asset, reduced by its estimated salvage value, using the straight-line method for financial reporting purposes. We begin depreciating assets in the month that each asset is placed in service and, therefore, is ready for its intended use, and depreciate each asset until it is taken out of service and available for sale. Accelerated methods are used for income tax reporting purposes. Following is a summary of estimated useful lives for financial reporting purposes:

	Years
Tractors		5
Trailers		7
Service and other equipment	3	-	15
Buildings and improvements	20	-	40

In

2018,

we replaced our company-owned tractors within an average of

3.7

years and our trailers within an average of

5.5

years after purchase. Our useful lives for depreciating tractors is

five

years and for trailers is

seven

years, with a

25%

salvage value for tractors and a

35%

salvage value for trailers. These salvage values are based upon the expected market values of the equipment after

five

years for tractors and

seven

years for trailers. Depreciation expense calculated in this manner approximates the continuing declining value of the revenue equipment, and continues at a consistent straight-line rate for units held beyond the normal replacement cycle.

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset

may

not

be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future net undiscounted cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the costs to sell.

Tires in service:

The cost of original equipment and replacement tires placed in service is capitalized. Amortization is calculated based on cost, less estimated salvage value, using the straight-line method over

24

months. Tire amortization, which is included within supplies and maintenance in our consolidated statements of operations, was

$7.0

million in

2018,

$7.1

million in

2017

and

$6.9

million in

2016.

The current portion of capitalized tires in service is included in prepaid expenses and other in the accompanying consolidated balance sheets. The long-term portion of capitalized tires in service and the estimated salvage value are included in revenue equipment in the accompanying consolidated balance sheets. The cost of recapping tires is charged to operations as incurred.

Income taxes:

Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. We have reflected the necessary deferred tax assets and liabilities in the accompanying consolidated balance sheets. We believe the future tax deductions will be realized principally through future reversals of existing taxable temporary differences and future taxable income.

In the ordinary course of business there is inherent uncertainty in quantifying our income tax positions. We assess our income tax positions and record tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting dates. For those tax positions where it is more-likely-than-

not

that a tax benefit will be sustained, we have recorded the largest amount of tax benefit with a greater than

50%

likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is

not

more-likely-than-

not

that a tax benefit will be sustained,

no

tax benefit has been recognized in the financial statements. Potential accrued interest and penalties related to unrecognized tax benefits are recognized as a component of income tax expense.

Insurance and claims:

We self-insure, in part, for losses relating to workers’ compensation, auto liability, general liability, cargo, and property damage claims, along with employees’ health insurance with varying risk retention levels. We are responsible for the

first

$1.0

million on each auto liability claim. We are also responsible for the

first

$750,000

on each workers’ compensation claim. We maintain insurance coverage for per-incident and total losses in excess of these risk retention levels in amounts we consider adequate based upon historical experience and our ongoing review. We reserve currently for the estimated cost of the uninsured portion of pending claims, including legal costs. These reserves are periodically evaluated and adjusted based on our evaluation of the nature and severity of outstanding individual claims and an estimate of future claims development based on historical development. Under agreements with our insurance carriers and regulatory authorities, we have

$14.6

million in standby letters of credit to guarantee settlement of claims.

Revenue recognition:

We account for our revenue in accordance with Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC

606,

Revenue from Contracts with Customers

, which we adopted on

January 1, 2018

using the modified retrospective method. The new revenue standard requires us to recognize revenue and related expenses within each of our

four

reporting segments over time, compared with our former policy in which we recorded revenue and related expenses on the date shipment of freight was completed.

We account for revenue of our Intermodal and Brokerage segments and revenue on freight transported by independent contractors within our Truckload and Dedicated segments on a gross basis because we are the principal service provider controlling the promised service before it is transferred to each customer. We are primarily responsible for fulfilling the promise to provide each specified service to each customer. We bear the primary risk of loss in the event of cargo claims by our customers. We also have complete control and discretion in establishing the price for each specified service. Accordingly, all such revenue billed to customers is classified as operating revenue and all corresponding payments to carriers for transportation services we arrange in connection with brokerage and intermodal activities and to independent contractor providers of revenue equipment are classified as purchased transportation expense within our consolidated statements of operations. See Note

3

for more information.

Our largest customer, Walmart, accounted for

15%

of our revenue in

2018

and

12%

of our trade receivables as of

December 31, 2018,

19%

of our revenue in

2017

and

15%

of our trade receivables as of

December 31, 2017

and

17%

of our revenue in

2016.

Our

second

largest customer, The Coca-Cola Company, accounted for

13%

of our revenue in

2018

and

7%

of our trade receivables as of

December 31, 2018.

During each of

2018,

2017

and

2016,

approximately

99%

of our revenue was generated within the United States.

Share-based payment arrangement compensation:

Under our stock incentive plans, all of our employees and any subsidiary employees, as well as all of our non-employee directors,

may

be granted stock-based awards, including incentive and non-statutory stock options and performance unit awards. We account for share-based payment arrangements in accordance with FASB ASC

718,

Compensation-Stock Compensation

, which requires all share-based payments to employees and non-employee directors, including grants of employee stock options and performance unit awards, to be recognized in the income statement based on their fair values at the date of grant.

Earnings per common share:

Basic earnings per common share is computed by dividing net income by the weighted average number of common shares outstanding during the year. Diluted earnings per common share is computed by dividing net income by the sum of the weighted average number of common shares outstanding plus all additional common shares that would have been outstanding if potentially dilutive common shares related to stock options and performance unit awards had been issued using the treasury stock method.

Segment reporting:

We report our operating segments in accordance with accounting standards codified in FASB ASC

280,

Segment Reporting

. We have

five

current operating segments that are aggregated into

four

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

3

for more information.

Use of estimates:

We must make estimates and assumptions to prepare the consolidated financial statements in conformity with U.S. generally accepted accounting principles. These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities in the consolidated financial statements and the reported amount of revenue and expenses during the reporting period. These estimates are primarily related to insurance and claims accruals and depreciation. Ultimate results could differ from these estimates.

Recent accounting pronouncements:

In

February 2016,

the FASB issued Accounting Standards Update, or ASU,

No.

2016

-

02,

“Leases” which requires organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The new guidance also requires additional disclosures related to leasing transactions. The standard is effective for the

first

quarter of

2019.

We will adopt the standard effective

January 1, 2019

under the modified retrospective approach by recognizing the cumulative effect of initially applying the standard as an increase of

$1.0

million to each of our assets and liabilities in our consolidated balance sheets. We expect the impact of the adoption of the standard to be immaterial to our consolidated balance sheets, statements of operations and statements of cash flows on an ongoing basis. We will include the additional required disclosures beginning with our Form

10

-Q for the

first

quarter of

2019.

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Note 2 - Adoption of New Accounting Standard

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

New Accounting Pronouncements and Changes in Accounting Principles [Text Block]

2.

Adoption of New Accounting Standard

We account for our revenue in accordance with FASB ASC

606,

Revenue from Contracts with Customers

, which we adopted on

January 1, 2018

using the modified retrospective method. We recognized the cumulative effect of initially applying the new revenue standard as an increase of

$485,000

to the opening balance of retained earnings. The comparative information has

not

been restated and continues to be reported under the accounting standards in effect for those periods. The impact of the adoption of the new revenue standard will be immaterial to our net income and financial position on an ongoing basis.

The new revenue standard requires us to recognize revenue and related expenses within each of our

four

reporting segments over time, compared with our former policy in which we recorded revenue and related expenses on the date shipment of freight was completed.

The cumulative effect of the changes made to our consolidated balance sheet on

January 1, 2018

for the adoption of the new revenue standard was as follows:

(In thousands)	Balance at December 31, 2017		Adjustments due to ASC 606			Balance at January 1, 2018
Assets:
Prepaid expenses and other	$	19,810	$	2,445	(a)	$	22,255
Liabilities:
Accounts payable and accrued liabilities		38,100		1,960			40,060
Stockholders’ equity:
Retained earnings		448,542		485			449,027

(a) Contract assets balance at January 1, 2018.

The impact of the adoption of the new revenue standard on our consolidated statement of operations and balance sheet was as follows:

	Year Ended December 31, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments due to ASC 606			As Reported
Operating revenue	$	788,216	$	(622	)	$	787,594
Operating expenses:
Salaries, wages and benefits		252,327		(280	)		252,047
Purchased transportation		144,573		38			144,611
Fuel and fuel taxes		121,666		(33	)		121,633
Supplies and maintenance		40,832		21			40,853
Income taxes expense		16,121		(119	)		16,002
Net income		55,276		(249	)		55,027

	Balance at December 31, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments due to ASC 606			As Reported
Assets:
Prepaid expenses and other	$	18,101	$	1,823	(a)	$	19,924
Liabilities:
Accounts payable and accrued liabilities		42,283		1,587			43,870
Stockholders’ equity:
Retained earnings		498,359		236			498,595

(a) Contract assets balance at December 31, 2018.

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Note 3 - Revenue and Business Segments

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Segment Reporting Disclosure [Text Block]

3.

Revenue and Business Segments

We account for our revenue in accordance with FASB ASC

606,

Revenue from Contracts with Customers

, which we adopted on

January 1, 2018

using the modified retrospective method. We combine our

five

current operating segments into

four

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

four

reporting segments are also the appropriate categories for the disaggregation of our revenue under FASB ASC

606.

We have strategically transitioned from a long-haul carrier to a multifaceted business offering a network of truck-based transportation capabilities across our

five

distinct business platforms – Truckload, Dedicated, Intermodal, Brokerage and MRTN de Mexico.

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 agreements with customers range from

three

to

five

years and are subject to annual rate reviews.

Generally, we are paid by the mile for our Truckload and Dedicated services. We also derive Truckload and Dedicated revenue from fuel surcharges, loading and unloading activities, equipment detention and other accessorial services. The main factors that affect our Truckload and Dedicated revenue are the rate per mile we receive from our customers, the percentage of miles for which we are compensated, the number of miles we generate with our equipment and changes in fuel prices. We monitor our revenue production primarily through average Truckload and Dedicated revenue, net of fuel surcharges, per tractor per week. We also analyze our average Truckload and Dedicated revenue, net of fuel surcharges, per total mile, non-revenue miles percentage, the miles per tractor we generate, our fuel surcharge revenue, our accessorial revenue and our other sources of operating revenue.

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. The main factors that affect our Intermodal revenue are the rate per mile and other charges we receive from our customers.

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 United States Department of Transportation, or DOT. We retain the billing, collection and customer management responsibilities. The main factors that affect our Brokerage revenue are the rate per mile and other charges that we receive from our customers.

Operating results of our MRTN de Mexico business which offers our customers door-to-door service between the United States and Mexico with our Mexican partner carriers is reported within our Truckload and Brokerage segments.

Our customer agreements are typically for

one

-year terms except for our Dedicated agreements which range from

three

to

five

years with annual rate reviews. Under FASB ASC

606,

the contract date for each individual load within each of our

four

reporting segments is generally the date that each load is tendered to and accepted by us. For each load transported within each of our

four

reporting segments, the entire amount of revenue to be recognized is a single performance obligation and our agreements with our customers detail the per-mile charges for line haul and fuel surcharges, along with the rates for loading and unloading, stop offs and drops, equipment detention and other accessorial services, which is the transaction price. There are

no

discounts that would be a material right or consideration payable to a customer. We are required to recognize revenue and related expenses over time, from load pickup to delivery, for each load within each of our

four

reporting segments. We base our calculation of the amount of revenue to record in each period for individual loads picking up in

one

period and delivering in the following period using the number of hours estimated to be incurred within each period applied to each estimated transaction price. Contract assets for this estimated revenue are classified within prepaid expenses and other within our consolidated balance sheet as of

December 31, 2018.

We had

no

impairment losses on contract assets in

2018.

We bill our customers for loads after delivery is complete with standard payment terms of

30

days.

We account for revenue of our Intermodal and Brokerage segments and revenue on freight transported by independent contractors within our Truckload and Dedicated segments on a gross basis, as discussed in our revenue policy note.

The following table sets forth for the years 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.

(Dollars in thousands)	201 8		2017		2016
Operating revenue:
Truckload revenue, net of fuel surcharge revenue	$	322,324	$	336,596	$	339,967
Truckload fuel surcharge revenue		53,016		43,614		35,884
Total Truckload revenue		375,340		380,210		375,851
Dedicated revenue, net of fuel surcharge revenue		187,137		153,691		147,007
Dedicated fuel surcharge revenue		36,715		13,190		10,363
Total Dedicated revenue		223,852		166,881		157,370
Intermodal revenue, net of fuel surcharge revenue		85,572		70,282		64,508
Intermodal fuel surcharge revenue		16,453		10,339		6,982
Total Intermodal revenue		102,025		80,621		71,490
Brokerage revenue		86,377		70,408		66,433
Total operating revenue	$	787,594	$	698,120	$	671,144
Operating income:
Truckload	$	35,067	$	26,326	$	27,438
Dedicated		18,589		17,074		19,550
Intermodal		11,150		8,303		7,131
Brokerage		5,542		5,159		4,184
Total operating income	$	70,348	$	56,862	$	58,303

Truckload segment depreciation expense was

$52.2

million,

$57.2

million and

$56.2

million, Dedicated segment depreciation expense was

$29.6

million,

$22.0

million and

$20.6

million, Intermodal segment depreciation expense was

$5.5

million,

$4.6

million and

$3.9

million, and Brokerage segment depreciation expense was

$1.3

million,

$1.3

million and

$1.7

million, in

2018,

2017

and

2016,

respectively.

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Note 4 - Details of Consolidated Balance Sheet Accounts

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Supplemental Balance Sheet Disclosures [Text Block]

4

.

Details of Consolidated Balance Sheet Accounts

Prepaid expenses and other:

As of

December 31,

prepaid expenses and other consisted of the following:

(In thousands)	201 8		2017
Tires in service	$	5,011	$	4,787
License fees		4,760		4,858
Parts and tires inventory		3,528		4,322
Insurance premiums		1,831		3,057
Contract assets		1,823		—
Other		2,971		2,786
	$	19,924	$	19,810

Accrued liabilities:

As of

December 31,

accrued liabilities consisted of the following:

(In thousands)	201 8		2017
Salaries and wages	$	9,744	$	4,171
Accrued expenses		7,091		8,212
Vacation		5,895		5,621
Accrued liability to MWL		1,222		1,765
Other		4,214		1,853
	$	28,166	$	21,622

XML

Note 5 - Long-term Debt

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Debt Disclosure [Text Block]

5

. Long-Term Debt

In

August 2018,

we entered into an amendment to our unsecured committed credit facility which reduces the aggregate principal amount of the facility from

$40.0

million to

$30.0

million and extends the term of the facility to

August 2023.

At

December 31, 2018,

there was

no

outstanding principal balance on the facility. As of that date, we had outstanding standby letters of credit to guarantee settlement of self-insurance claims of

$14.6

million and remaining borrowing availability of

$15.4

million. At

December 31, 2017,

there was also

no

outstanding principal balance on the facility. As of that date, we had outstanding standby letters of credit of

$12.9

million on the facility. This facility bears interest at a variable rate based on the London Interbank Offered Rate or the lender’s Prime Rate, in each case plus/minus applicable margins. The interest rate for the facility that would apply to outstanding principal balances was

3.2%

at

December 31, 2018.

Our credit facility prohibits us from paying, in any fiscal year, stock redemptions and dividends in excess of

25%

of our net income from the prior fiscal year. A waiver of the

25%

limitation for

2016

was obtained from the lender. This facility also contains restrictive covenants which, among other matters, require us to maintain compliance with cash flow leverage and fixed charge coverage ratios. We were in compliance with all covenants at

December 31, 2018

and

2017.

XML

Note 6 - Related Party Transactions

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Related Party Transactions Disclosure [Text Block]

6

. Related Party Transactions

The following related party transactions occurred during the

three

years ended

December 31, 2018;

(a)     We purchase fuel and tires and obtain related services from a company in which

one

of our directors is the chairman of the board, chief executive officer and the principal stockholder. We paid that company

$341,000

in

2018,

$328,000

in

2017

and

$361,000

in

2016

for fuel, tires and related services. In addition, we paid

$2.5

million in both

2018

and

2017

and

$2.0

million in

2016

to tire manufacturers for tires that were provided by the same company. The same company received commissions from the tire manufacturers related to these purchases. We did

not

have any payables to that company as of

December 31, 2018

or

2017.

(b)     We provide transportation services to MWL as described in Note

13.

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Note 7 - Income Taxes

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Income Tax Disclosure [Text Block]

7

. Income Taxes

We recorded a

$56.5

million deferred income taxes benefit in

2017

to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from

35%

to

21%

related to the Tax Cuts and Jobs Act of

2017,

which was enacted prior to

December 31, 2017.

Excluding that benefit, the

2017

federal deferred provision was

$8.0

million and the effective tax rate was

40.1%.

The Tax Cuts and Jobs Act of

2017

makes broad and complex changes to the U.S. tax code including, but

not

limited to, reducing the federal corporate income tax rate as noted above beginning on

January 1, 2018

and allowing bonus depreciation with full expensing of qualified property placed in service after

September 27, 2017.

The components of the income taxes expense (benefit) consisted of the following:

(In thousands)	201 8			2017			2016
Current:
Federal	$	7,575		$	12,427		$	8,987
State		3,076			990			1,125
Total current		10,651			13,417			10,112
Deferred:
Federal		5,815			(48,424	)		12,427
State		(464	)		1,196			1,063
Total deferred		5,351			(47,228	)		13,490
Total expense (benefit)	$	16,002		$	(33,811	)	$	23,602

The federal statutory income tax rate is reconciled to the effective income tax rate as follows:

	201 8			2017			2016
Federal statutory income tax rate		21	%		35	%		35	%
Per diem and other non-deductible expenses		2			4			4
Increase in taxes arising from state income taxes, net of federal income tax benefit		3			3			2
Federal tax credits		(2	)		(1	)		—
Decrease in federal deferred taxes due to decrease in statutory rate		—			(100	)		—
Other, net		(1	)		(1	)		—
Effective tax rate		23	%		(60	)%		41	%

As of

December 31,

the net deferred tax liability consisted of the following:

(In thousands)	201 8		2017
Deferred tax assets:
Reserves and accrued liabilities	$	7,986	$	7,277
Other		2,313		1,965
		10,299		9,242
Deferred tax liabilities:
Depreciation		113,773		107,453
Prepaid expenses		2,503		2,415
		116,276		109,868
Net deferred tax liability	$	105,977	$	100,626

We have

not

provided a valuation allowance against deferred tax assets at

December 31, 2018

or

2017.

We believe the deferred tax assets will be realized principally through future reversals of existing taxable temporary differences (deferred tax liabilities) and future taxable income.

Our reserves for unrecognized tax benefits were

$1.9

million as of

December 31, 2018

and

$407,000

as of

December 31, 2017.

The

$1.5

million increase in the amount reserved in

2018

relates to current period tax positions and an amendment to prior periods’ open returns for a current position less the removal of the reserve relating to

2013

tax positions, as that period has now closed. The amount reserved as of

December 

31,

2017

was added in

2013

through

2017

relating to current period tax positions. If recognized,

$1.8

million of the unrecognized tax benefits as of

December 31, 2018

would favorably impact our effective tax rate. Potential interest and penalties related to unrecognized tax benefits of

$12,000

and

$11,000

were recognized in our financial statements as of

December 

31,

2018

and

2017,

respectively. We do

not

expect the reserves for unrecognized tax benefits to change significantly within the next

twelve

months. The federal statute of limitations remains open for

2015

and forward. We file tax returns in numerous state jurisdictions with varying statutes of limitations.

XML

Note 8 - Earnings Per Common Share

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Earnings Per Share [Text Block]

8

. Earnings per Common Share

Basic and diluted earnings per common share were computed as follows:

(In thousands, except per share amounts)	201 8		2017		2016
Numerator:
Net income	$	55,027	$	90,284	$	33,464
Denominator:
Basic earnings per common share - weighted-average shares		54,590		54,492		54,177
Effect of dilutive stock options		559		358		284
Diluted earnings per common share - weighted-average shares and assumed conversions		55,149		54,850		54,461
Basic earnings per common share	$	1.01	$	1.66	$	0.62
Diluted earnings per common share	$	1.00	$	1.65	$	0.61

Options totaling

153,500,

145,169

and

564,833

equivalent shares were outstanding but were

not

included in the calculation of diluted earnings per share for

2018,

2017

and

2016,

respectively, because including the options in the denominator would be antidilutive, or decrease the number of weighted-average shares, due to their exercise prices exceeding the average market price of the common shares, or because inclusion of average unrecognized compensation expense in the calculation would cause the options to be antidilutive.

Unvested performance unit awards (see Note

14

) totaling

1,638,

124,046

and

64,162

equivalent shares for

2018,

2017

and

2016,

respectively, were considered outstanding but were

not

included in the calculation of diluted earnings per share because inclusion of average unrecognized compensation expense in the calculation would cause the performance units to be antidilutive.

XML

Note 9 - Stock Split

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Stock Split Disclosure [Text Block]

9

. Stock Split

On

July 7, 2017,

we effected a

five

-for-

three

stock split of our common stock,

$.01

par value, in the form of a

66

⅔% stock dividend. Our consolidated financial statements, related notes, and other financial data contained in this report have been adjusted to give retroactive effect to the stock split for all periods presented.

XML

Note 10 - Share Repurchase Program

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Treasury Stock [Text Block]

10

. Share Repurchase Program

In

2007,

our Board of Directors approved and we announced a share repurchase program to repurchase up to

one million

shares of our common stock either through purchases on the open market or through private transactions and in accordance with Rule

10b

-

18

of the Exchange Act. In

2015,

our Board of Directors approved and we announced an increase in the share repurchase program, providing for the repurchase of up to

$40

million, or approximately

two million

shares, of our common stock, which was increased by our Board of Directors to

3.3

million shares in

August 2017

to reflect the

five

-for-

three

stock split effected in the form of a stock dividend on

July 7, 2017.

The timing and extent to which we repurchase shares depends on market conditions and other corporate considerations. The repurchase program does

not

have an expiration date.

We repurchased and retired

200,000

shares of our common stock for

$3.8

million in the

fourth

quarter of

2018.

We did

not

repurchase any shares in

2017.

We repurchased and retired

759,302

shares of our common stock for

$7.5

million in the

first

quarter of

2016.

As of

December 31, 2018,

future repurchases of up to

$12.6

million, or

806,000

shares, were available in the share repurchase program.

XML

Note 11 - Dividends

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Dividends [Text Block]

11

. Dividends

In

2010,

we announced that our Board of Directors approved a regular cash dividend program to our stockholders, subject to approval each quarter. Quarterly cash dividends of

$0.025

per share of common stock were declared in each quarter of

2018

and totaled

$5.5

million. Quarterly cash dividends of

$0.015

per share of common stock were declared in each of the

first

two

quarters of

2017

along with dividends of

$0.025

per share in each of

2017’s

last

two

quarters, which totaled

$4.4

million. Quarterly cash dividends of

$0.015

per share of common stock were declared in each quarter of

2016

and totaled

$3.3

million.

XML

Note 12 - Third Amendment to Amended and Restated Certificate of Incorporation

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Stockholders' Equity Note Disclosure [Text Block]

1

2

.

Third

Amendment to Amended and Restated Certificate of Incorporation

In

May 2018,

our stockholders approved our Third Amendment to Amended and Restated Certificate of Incorporation increasing the authorized number of shares of common stock,

$.01

par value, from

96

million shares to

192

million shares.

XML

Note 13 - Equity Investment

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Business Combination Disclosure [Text Block]

1

3

. Equity Investment

We own a

45%

equity interest in MWL, a

third

-party provider of logistics services to the transportation industry. A non-related party owns the other

55%

equity interest in MWL. We account for our ownership interest in MWL under the equity method of accounting. We received

$5.5

million,

$2.2

million and

$1.2

million of our revenue for loads transported by our tractors and arranged by MWL in

2018,

2017

and

2016,

respectively. As of

December 31, 2018,

we also had a trade receivable in the amount of

$630,000

from MWL and an accrued liability of

$1.2

million to MWL for the excess of payments by MWL’s customers into our lockbox account over the amounts drawn on the account by MWL.

XML

Note 14 - Employee Benefits

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Compensation and Employee Benefit Plans [Text Block]

1

4

. Employee Benefits

Equity Incentive Plans

- In

May 2015,

our stockholders approved our

2015

Equity Incentive Plan (the

“2015

Plan”). Our Board of Directors adopted the

2015

Plan in

March 2015.

Under our

2015

Plan, all of our employees and any subsidiary employees, as well as all of our non-employee directors,

may

be granted stock-based awards, including non-statutory stock options, performance unit awards and shares of common stock, of which

998,022

shares have been awarded as of

December 31, 2018.

Stock options expire within

7

or

10

years after the date of grant and the exercise price must be at least the fair market value of our common stock on the date of grant. Stock options issued to employees are generally exercisable beginning

one

year from the date of grant in cumulative amounts of

20%

per year. Performance unit awards are subject to vesting requirements over a

five

-year period, primarily based on our earnings growth. Options exercised and performance unit award shares issued represent newly issued shares. The maximum number of shares of common stock available for issuance under the

2015

Plan is

1,333,333

shares. As of

December 31, 2018,

there were

568,873

shares reserved for issuance under options outstanding and

349,814

shares reserved for issuance under outstanding performance unit awards under the

2015

Plan. The

2015

Plan replaces our

2005

Stock Incentive Plan (the

“2005

Plan”), which expired by its terms in

May 2015.

Under the

2005

Plan, officers, directors and employees were granted non-statutory stock options and performance unit awards with similar terms to the options and awards under the

2015

Plan. As of

December 31, 2018,

there were

370,320

shares reserved for issuance under options outstanding, which will continue according to their terms. As of the same date, there were

no

shares reserved for issuance under outstanding performance unit awards under the

2005

Plan.

No

additional awards will be granted under the

2005

Plan.

We use the Black-Scholes option pricing model to calculate the grant-date fair value of option awards. The fair value of service-based option awards granted was estimated as of the date of grant using the following weighted average assumptions:

	201 8			2017			2016
Expected option life in years (1)		6.0			6.0			6.0
Expected stock price volatility percentage (2)		26	%		25	%		25	%
Risk-free interest rate percentage (3)		2.8	%		2.0	%		1.4	%
Expected dividend yield (4)		0.48	%		0.59	%		0.50	%
Fair value as of the date of grant	$	6.19		$	4.34		$	3.17

( 1 ) Expected option life – We use historical employee exercise and option expiration data to estimate the expected life assumption for the Black-Scholes grant-date valuation. We believe that this historical data is currently the best estimate of the expected term of a new option. We use a weighted-average expected life for all awards.

( 2 ) Expected stock price volatility – We use our stock’s historical volatility for the same period of time as the expected life. We have no reason to believe that its future volatility will differ from the past.

( 3 ) Risk-free interest rate – The rate is based on the U.S. Treasury yield curve in effect at the time of the grant for the same period of time as the expected life.

( 4 ) Expected dividend yield – The calculation is based on the total expected annual dividend payout divided by the average stock price.

Compensation costs associated with service-based option awards with graded vesting are recognized, net of an estimated forfeiture rate, on a straight-line basis over the requisite service period, which is the period between the grant date and the award’s stated vesting term. Service-based option awards become immediately exercisable in full in the event of death or disability and upon a change in control with respect to all options that have been outstanding for at least

six

months.

In

May 2012,

we granted

98,750

performance unit awards under our

2005

Stock Incentive Plan to certain employees. This was our

third

grant of such awards. As of

December 31, 2012

and each

December 31

st

thereafter through

December 31, 2016,

each award vested and became the right to receive a number of shares of common stock equal to a total vesting percentage multiplied by the number of units subject to such award. The total vesting percentage for each of the

five

years was equal to the sum of a performance vesting percentage, which was the percentage increase, if any, in our diluted net income per share for the year being measured over the prior year, and a service vesting percentage of

five

percentage points. All payments were made in shares of our common stock. One half of the vested performance units were paid to the employees immediately upon vesting, with the other half being credited to the employees’ accounts within the Marten Transport, Ltd. Deferred Compensation Plan, which restricts the sale of vested shares to the later of each employee’s termination of employment or attainment of age

62.

In

May 2013,

we granted

104,250

performance unit awards with similar terms to the awards previously granted, and which vested from

December 31, 2013

through

2017.

In

May 2014,

we granted

60,668

performance unit awards with similar terms to the awards previously granted, and also granted

18,337

performance unit awards with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in

2014

vested from

December 31, 2014

through

2018.

In

May 2015,

we granted

58,335

performance unit awards under our

2015

Equity Incentive Plan with similar terms to the awards previously granted, and also granted

32,500

performance unit awards with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in

2015

vest from

December 31, 2015

through

2019.

In

May 2016,

we granted

57,669

performance unit awards under our

2015

Equity Incentive Plan with similar terms to the awards previously granted, except that the calculation of vesting shares is based on our increase in net income instead of our increase in diluted net income per share. As permitted in the performance unit award agreements granted in

2011

through

2015,

the calculation of the performance vesting component beginning with the year

2015

was adjusted to be based on the increase in net income. We also granted

21,671

performance unit awards in

May 2016

and

1,667

awards in

August 2016

with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in

2016

vest from

December 31, 2016

through

2020.

In

May 2017,

we granted

109,169

performance unit awards under our

2015

Equity Incentive Plan with similar terms to the awards granted in

2016,

except that the service-based component was increased from

five

percent to

ten

percent per year. The Compensation Committee adjusted the equity vesting formula to better align it with our long-range growth plan. We also granted

43,342

performance unit awards in

May 2017

and

2,000

awards in

August 2017

with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in

2017

vest from

December 31, 2017

through

2021.

In

May 2018,

we granted

45,700

performance unit awards under our

2015

Equity Incentive Plan with similar terms to the awards granted in

2017.

We also granted

28,000

performance unit awards in

May 2018

and

2,000

awards in

August 2018

with similar terms to such awards, except that all vested performance units will be paid to the employees immediately upon vesting. These awards granted in

2018

vest from

December 31, 2018

through

2022.

We also granted

2,000

performance unit awards in

December 2018

with similar terms to the awards granted in

August 2018,

except that the awards vest from

December 31, 2019

through

2023.

The fair value of each performance unit is based on the closing market price on the date of grant. We recognize compensation expense for these awards based on the estimated number of units probable of achieving the vesting requirements of the awards, net of an estimated forfeiture rate.

The amount of share-based compensation recognized during a period is based on the value of the portion of the awards that are ultimately expected to vest. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We currently expect, based on an analysis of our historical forfeitures and known forfeitures on existing awards, that approximately

1.25%

of unvested outstanding awards will be forfeited each year. This analysis will be re-evaluated quarterly and the forfeiture rate will be adjusted as necessary. Ultimately, the actual expense recognized over the vesting period will only be for those shares that vest.

Total share-based compensation expense recorded in

2018

was

$3.3

million (

$2.6

million net of income tax benefit,

$0.05

earnings per basic and diluted share), in

2017

was

$1.3

million (

$738,000

net of income tax benefit,

$0.01

of earnings per basic and diluted share), and in

2016

was

$883,000

(

$547,000

net of income tax benefit,

$0.01

of earnings per basic and diluted share). All share-based compensation expense was recorded in salaries, wages and benefits expense.

As of

December 31, 2018,

there was a total of

$1.6

million of unrecognized compensation expense related to unvested service-based option awards, which is expected to be recognized over a weighted-average period of

3.2

years, and

$2.4

million of unrecognized compensation expense related to unvested performance unit awards, which will be recorded based on the estimated number of units probable of achieving the vesting requirements of the awards through

2022.

Effective

January 1, 2017,

we adopted the provisions of FASB ASU

No.

2016

-

09,

“Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting” which simplifies several aspects of the accounting for share-based payment transactions. The adoption of this standard resulted in decreases to our provision for income taxes in

2018

of

$319,000

and in

2017

of

$176,000,

as the actual increase in our stock price exceeded the grant-date fair value of the period’s exercised options and vested performance unit awards. Excess tax benefits were recognized in additional paid-in capital through

2016.

Option activity in

2018

was as follows:

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2017		918,583		$	12.02
Granted		154,500			21.26
Exercised		(105,588	)		8.91
Forfeited		(28,302	)		15.66
Outstanding at December 31, 2018		939,193		$	13.78
Exercisable at December 31, 2018		545,713		$	11.49

The

939,193

options outstanding as of

December 31, 2018

have a weighted average remaining contractual life of

3.8

years and an aggregate intrinsic value based on our closing stock price on

December 31, 2018

for in-the-money options of

$3.0

million. The

545,713

options exercisable as of the same date have a weighted average remaining contractual life of

2.7

years and an aggregate intrinsic value similarly calculated of

$2.6

million.

The fair value of options granted in

2018,

2017

and

2016

was

$957,000,

$592,000

and

$227,000,

respectively, for service-based options. The total intrinsic value of options exercised in

2018,

2017

and

2016

was

$1.5

million,

$830,000

and

$1.9

million, respectively. Intrinsic value is the difference between the fair value of the acquired shares at the date of exercise and the exercise price, multiplied by the number of options exercised. Proceeds received from option exercises in

2018,

2017

and

2016

were

$938,000,

$1.1

million and

$4.4

million, respectively.

Nonvested service-based option awards as of

December 31, 2018

and changes during

2018

were as follows:

	Shares			Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (in Years)
Nonvested at December 31, 2017		413,228		$	3.79		5.1
Granted		154,500			6.19		6.7
Vested		(146,546	)		3.73		3.4
Forfeited		(27,702	)		4.26		5.1
Nonvested at December 31, 2018		393,480		$	4.72		5.2

The total fair value of options which vested during

2018,

2017

and

2016

was

$547,000,

$515,000

and

$534,000,

respectively.

The following table summarizes our nonvested performance unit award activity in

2018:

	Shares				Weighted Average Grant Date Fair Value
Nonvested at December 31, 2017		322,662			$	13.32
Granted		77,700				20.31
Vested		(182,481	)	(1)		14.55
Forfeited		(31,973	)			13.81
Nonvested at December 31, 2018		185,909			$	14.89

( 1 ) This number of performance unit award shares vested based on our financial performance in 2018 and was distributed or credited to the Marten Transport, Ltd. Deferred Compensation Plan in February 2019. As permitted in the performance unit award agreements granted in 2014 and 2015, the Compensation Committee of our Board of Directors adjusted the calculation of the performance vesting component for 2018 to be based on our increase in net income instead of our increase in diluted net income per share. Additionally, the $56.5 million deferred income taxes benefit in 2017 related to the federal Tax Cuts and Jobs Act of 2017 was excluded from the calculation of the increase in net income from 2017 to 2018. The calculation of the increase in net income also included an adjustment of 2017 net income to reflect a federal income tax rate of 21% instead of 35%, to be consistent with the federal rate in 2018.  The fair value of unit award shares that vested in 2018 was $2.7 million.  

Retirement Savings Plan

- We sponsor a defined contribution retirement savings plan under Section

401

(k) of the Internal Revenue Code. Employees are eligible for the plan after

three

months of service. Participants are able to contribute up to the limit set by law, which in

2018

was

$18,500

for participants less than age

50

and

$24,500

for participants age

50

and above. We contribute

35%

of each participant’s contribution, up to a total of

6%

contributed. Our contribution vests at the rate of

20%

per year for the

first

through

fifth

years of service. In addition, we

may

make elective contributions as determined by the Board of Directors.

No

elective contributions were made in

2018,

2017

or

2016.

Total expense recorded for the plan was

$2.3

million in

2018

and

$2.1

million in each of

2017

and

2016.

Stock Purchase Plans

- An Employee Stock Purchase Plan and an Independent Contractor Stock Purchase Plan are sponsored to encourage employee and independent contractor ownership of our common stock. Eligible participants specify the amount of regular payroll or contract payment deductions and voluntary cash contributions that are used to purchase shares of our common stock. The purchases are made at the market price on the open market. We pay the broker’s commissions and administrative charges for purchases of common stock under the plans.

XML

Note 15 - Excess Tax Benefit Reclassification

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

1

5

. Excess Tax Benefit Reclassification

Effective

January 1, 2017,

we adopted the provisions of FASB ASU

No.

2016

-

09,

“Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting” which simplifies several aspects of the accounting for share-based payment transactions. This standard changed the classification of excess tax benefits in the statements of cash flows. We retrospectively reclassified

$235,000

of excess tax benefits for

2016

from financing to operating activities within our

2018

and

2017

consolidated statements of cash flows.

XML

Note 16 - Deferred Compensation Plan

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Postemployment Benefits Disclosure [Text Block]

1

6

. Deferred Compensation Plan

In

August 2010,

our Board of Directors approved and adopted the Marten Transport, Ltd. Deferred Compensation Plan. The deferred compensation plan is an unfunded, nonqualified deferred compensation plan designed to allow board elected officers and other select members of our management designated by our Compensation Committee to save for retirement on a tax-deferred basis.

Under the terms of the plan, each participant is eligible to defer portions of their base pay, annual bonus, or receipt of common stock otherwise payable under a vested performance unit award. Each participant can elect a fixed distribution date for the participant’s deferral account other than certain required performance unit award deferrals credited to the discretionary account, which will be distributed after the later of the date of the participant’s termination of employment or the date the participant attains age

62.

Upon termination of a participant’s employment with the company, the plan requires a lump-sum distribution of the deferral account, excluding the required performance unit award deferrals, unless the participant had elected an installment distribution. Upon a participant’s death, the plan provides that a participant’s distributions accelerate and will be paid in a lump sum to the participant’s beneficiary. We

may

terminate the plan and accelerate distributions to participants, but only to the extent and at the times permitted under the Internal Revenue Code. We

may

terminate the plan and accelerate distributions upon a change in control, which is

not

a payment event under the plan. In conjunction with the approval of the plan, our Board of Directors also adopted an amendment to the Marten Transport, Ltd.

2005

Stock Incentive Plan to allow for deferral of receipt of income from a performance unit award under the plan. Such deferral is also provided for within the Marten Transport, Ltd.

2015

Equity Incentive Plan. As of

December 31, 2018,

241,348

shares of Company common stock with a value of

$3.9

million were credited to account balances within the plan. These shares were required performance unit award deferrals of vested awards, and dividends earned on such shares.

XML

Note 17 - Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Fair Value Disclosures [Text Block]

1

7

. Fair Value of Financial Instruments

The carrying amounts of cash equivalents, accounts receivable and accounts payable approximate fair value because of the short maturity of these instruments.

XML

Note 18 - Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

1

8

. Commitments and Contingencies

We are committed to purchase

$91.1

million of new revenue equipment in

2019.

Operating lease obligation expenditures total

$672,000

through

2022.

We self-insure, in part, for losses relating to workers’ compensation, auto liability, general liability, cargo and property damage claims, along with employees’ health insurance with varying risk retention levels. We maintain insurance coverage for per-incident and total losses in excess of these risk retention levels in amounts we consider adequate based upon historical experience and our ongoing review, and reserve currently for the estimated cost of the uninsured portion of pending claims.

We are also involved in other legal actions that arise in the ordinary course of business. In the opinion of management, based upon present knowledge of the facts, it is remote that the ultimate outcome of any such legal actions will have a material adverse effect upon our long-term financial position or results of operations.

XML

Note 19 - Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Quarterly Financial Information [Text Block]

1

9

. Quarterly Financial Data (Unaudited)

The following is a summary of the quarterly results of operations for

2018

and

2017:

201 8 Quarters ( In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	186,960	$	197,024	$	199,649	$	203,961
Operating income		13,594		18,223		18,993		19,538
Net income		10,331		13,702		15,257		15,737
Basic earnings per common share		0.19		0.25		0.28		0.29
Diluted earnings per common share		0.19		0.25		0.28		0.29

201 7 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	173,159	$	171,511	$	170,679	$	182,771
Operating income		13,938		15,569		13,022		14,333
Net income		8,214		9,141		7,855		65,074
Net income – excluding deferred income taxes benefit (1)		8,214		9,141		7,855		8,609
Basic earnings per common share		0.15		0.17		0.14		1.19
Basic earnings per common share – excluding deferred income taxes benefit (1)		0.15		0.17		0.14		0.16
Diluted earnings per common share		0.15		0.17		0.14		1.18
Diluted earnings per common share – excluding deferred income taxes benefit (1)		0.15		0.17		0.14		0.16

( 1 ) The amounts are presented for comparative purposes excluding the $56.5 million deferred income taxes benefit recorded to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017.

The sum of the diluted earnings per common share for the

2018

quarters exceeds the amount for the year, and the sum of the basic and diluted earnings per common share for the

2017

quarters is less than the amounts for the year due to differences in rounding.

XML

Schedule II - Valuation and Qualifying Accounts and Reserves

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

SCHEDULE II

MARTEN TRANSPORT, LTD.

Valuation and Qualifying Accounts and Reserves
(In thousands)

	Balance at		Charged to
	Beginning of		Costs and						Balance at
Description	Year		Expenses		Deductions				End of Year
Insurance and claims accruals:
Year ended December 31, 2018	$	26,177	$	56,122	$	(54,196	)	(1)	$	28,103
Year ended December 31, 2017		19,440		53,609		(46,872	)	(1)		26,177
Year ended December 31, 2016		16,235		49,614		(46,409	)	(1)		19,440
Allowance for doubtful accounts:
Year ended December 31, 2018		300		163		(115	)	(2)		348
Year ended December 31, 2017		275		33		(8	)	(2)		300
Year ended December 31, 2016		305		88		(118	)	(2)		275

( 1 )	Claims payments
( 2 )	Write-off of bad debts, net of recoveries

See report of independent registered public accounting firm.

XML

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

Principles of consolidation:

The accompanying consolidated financial statements include Marten Transport, Ltd. and its subsidiaries. All intercompany accounts and transactions are eliminated upon consolidation.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and cash equivalents:

Cash in excess of current operating requirements is invested in short-term, highly liquid investments. We consider all highly liquid investments purchased with original maturities of

three

months or less to be cash equivalents. We maintain our cash and cash equivalents in bank accounts which, at times,

may

exceed federally insured limits. We have

not

experienced any losses in such accounts.

Receivables, Policy [Policy Text Block]

Trade accounts receivable:

Trade accounts receivable are recorded at the invoiced amounts, net of an allowance for doubtful accounts. A considerable amount of judgment is required in assessing the realization of these receivables including the current creditworthiness of each customer and related aging of the past-due balances, including any billing disputes. In order to assess the collectibility of these receivables, we perform ongoing credit evaluations of our customers’ financial condition. Through these evaluations, we

may

become aware of a situation where a customer

may

not

be able to meet its financial obligations due to deterioration of its financial viability, credit ratings or bankruptcy. The allowance for doubtful accounts is based on the best information available to us and is reevaluated and adjusted as additional information is received. We evaluate the allowance based on historical write-off experience, the size of the individual customer balances, past-due amounts and the overall national economy. We review the adequacy of our allowance for doubtful accounts monthly. Invoice balances over

30

days after the contractual due date are considered past due per our policy and are reviewed individually for collectibility. Initial payments by new customers are monitored for compliance with contractual terms. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential recovery is considered remote.

Property, Plant and Equipment, Policy [Policy Text Block]

Property and equipment:

Additions and improvements to property and equipment are capitalized at cost. Maintenance and repair expenditures are charged to operations. Gains and losses on disposals of revenue equipment are included in operations as they are a normal, recurring component of our operations.

Depreciation is computed based on the cost of the asset, reduced by its estimated salvage value, using the straight-line method for financial reporting purposes. We begin depreciating assets in the month that each asset is placed in service and, therefore, is ready for its intended use, and depreciate each asset until it is taken out of service and available for sale. Accelerated methods are used for income tax reporting purposes. Following is a summary of estimated useful lives for financial reporting purposes:

	Years
Tractors		5
Trailers		7
Service and other equipment	3	-	15
Buildings and improvements	20	-	40

In

2018,

we replaced our company-owned tractors within an average of

3.7

years and our trailers within an average of

5.5

years after purchase. Our useful lives for depreciating tractors is

five

years and for trailers is

seven

years, with a

25%

salvage value for tractors and a

35%

salvage value for trailers. These salvage values are based upon the expected market values of the equipment after

five

years for tractors and

seven

years for trailers. Depreciation expense calculated in this manner approximates the continuing declining value of the revenue equipment, and continues at a consistent straight-line rate for units held beyond the normal replacement cycle.

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset

may

not

be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future net undiscounted cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the costs to sell.

Tires In Service [Policy Text Block]

Tires in service:

The cost of original equipment and replacement tires placed in service is capitalized. Amortization is calculated based on cost, less estimated salvage value, using the straight-line method over

24

months. Tire amortization, which is included within supplies and maintenance in our consolidated statements of operations, was

$7.0

million in

2018,

$7.1

million in

2017

and

$6.9

million in

2016.

The current portion of capitalized tires in service is included in prepaid expenses and other in the accompanying consolidated balance sheets. The long-term portion of capitalized tires in service and the estimated salvage value are included in revenue equipment in the accompanying consolidated balance sheets. The cost of recapping tires is charged to operations as incurred.

Income Tax, Policy [Policy Text Block]

Income taxes:

Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. We have reflected the necessary deferred tax assets and liabilities in the accompanying consolidated balance sheets. We believe the future tax deductions will be realized principally through future reversals of existing taxable temporary differences and future taxable income.

In the ordinary course of business there is inherent uncertainty in quantifying our income tax positions. We assess our income tax positions and record tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting dates. For those tax positions where it is more-likely-than-

not

that a tax benefit will be sustained, we have recorded the largest amount of tax benefit with a greater than

50%

likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is

not

more-likely-than-

not

that a tax benefit will be sustained,

no

tax benefit has been recognized in the financial statements. Potential accrued interest and penalties related to unrecognized tax benefits are recognized as a component of income tax expense.

Internal Replacements of Insurance Contracts, Policy [Policy Text Block]

Insurance and claims:

We self-insure, in part, for losses relating to workers’ compensation, auto liability, general liability, cargo, and property damage claims, along with employees’ health insurance with varying risk retention levels. We are responsible for the

first

$1.0

million on each auto liability claim. We are also responsible for the

first

$750,000

on each workers’ compensation claim. We maintain insurance coverage for per-incident and total losses in excess of these risk retention levels in amounts we consider adequate based upon historical experience and our ongoing review. We reserve currently for the estimated cost of the uninsured portion of pending claims, including legal costs. These reserves are periodically evaluated and adjusted based on our evaluation of the nature and severity of outstanding individual claims and an estimate of future claims development based on historical development. Under agreements with our insurance carriers and regulatory authorities, we have

$14.6

million in standby letters of credit to guarantee settlement of claims.

Revenue Recognition, Policy [Policy Text Block]

Revenue recognition:

We account for our revenue in accordance with Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC

606,

Revenue from Contracts with Customers

, which we adopted on

January 1, 2018

using the modified retrospective method. The new revenue standard requires us to recognize revenue and related expenses within each of our

four

reporting segments over time, compared with our former policy in which we recorded revenue and related expenses on the date shipment of freight was completed.

We account for revenue of our Intermodal and Brokerage segments and revenue on freight transported by independent contractors within our Truckload and Dedicated segments on a gross basis because we are the principal service provider controlling the promised service before it is transferred to each customer. We are primarily responsible for fulfilling the promise to provide each specified service to each customer. We bear the primary risk of loss in the event of cargo claims by our customers. We also have complete control and discretion in establishing the price for each specified service. Accordingly, all such revenue billed to customers is classified as operating revenue and all corresponding payments to carriers for transportation services we arrange in connection with brokerage and intermodal activities and to independent contractor providers of revenue equipment are classified as purchased transportation expense within our consolidated statements of operations. See Note

3

for more information.

Our largest customer, Walmart, accounted for

15%

of our revenue in

2018

and

12%

of our trade receivables as of

December 31, 2018,

19%

of our revenue in

2017

and

15%

of our trade receivables as of

December 31, 2017

and

17%

of our revenue in

2016.

Our

second

largest customer, The Coca-Cola Company, accounted for

13%

of our revenue in

2018

and

7%

of our trade receivables as of

December 31, 2018.

During each of

2018,

2017

and

2016,

approximately

99%

of our revenue was generated within the United States.

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Share-based payment arrangement compensation:

Under our stock incentive plans, all of our employees and any subsidiary employees, as well as all of our non-employee directors,

may

be granted stock-based awards, including incentive and non-statutory stock options and performance unit awards. We account for share-based payment arrangements in accordance with FASB ASC

718,

Compensation-Stock Compensation

, which requires all share-based payments to employees and non-employee directors, including grants of employee stock options and performance unit awards, to be recognized in the income statement based on their fair values at the date of grant.

Earnings Per Share, Policy [Policy Text Block]

Earnings per common share:

Basic earnings per common share is computed by dividing net income by the weighted average number of common shares outstanding during the year. Diluted earnings per common share is computed by dividing net income by the sum of the weighted average number of common shares outstanding plus all additional common shares that would have been outstanding if potentially dilutive common shares related to stock options and performance unit awards had been issued using the treasury stock method.

Segment Reporting, Policy [Policy Text Block]

Segment reporting:

We report our operating segments in accordance with accounting standards codified in FASB ASC

280,

Segment Reporting

. We have

five

current operating segments that are aggregated into

four

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

3

for more information.

Use of Estimates, Policy [Policy Text Block]

Use of estimates:

We must make estimates and assumptions to prepare the consolidated financial statements in conformity with U.S. generally accepted accounting principles. These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities in the consolidated financial statements and the reported amount of revenue and expenses during the reporting period. These estimates are primarily related to insurance and claims accruals and depreciation. Ultimate results could differ from these estimates.

New Accounting Pronouncements, Policy [Policy Text Block]

Recent accounting pronouncements:

In

February 2016,

the FASB issued Accounting Standards Update, or ASU,

No.

2016

-

02,

“Leases” which requires organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The new guidance also requires additional disclosures related to leasing transactions. The standard is effective for the

first

quarter of

2019.

We will adopt the standard effective

January 1, 2019

under the modified retrospective approach by recognizing the cumulative effect of initially applying the standard as an increase of

$1.0

million to each of our assets and liabilities in our consolidated balance sheets. We expect the impact of the adoption of the standard to be immaterial to our consolidated balance sheets, statements of operations and statements of cash flows on an ongoing basis. We will include the additional required disclosures beginning with our Form

10

-Q for the

first

quarter of

2019.

XML

Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Property, Plant and Equipment [Table Text Block]

	Years
Tractors		5
Trailers		7
Service and other equipment	3	-	15
Buildings and improvements	20	-	40

XML

Note 2 - Adoption of New Accounting Standard (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Cumulative Effect of Adjustments for New Accounting Pronouncements on Balance Sheet [Table Text Block]

(In thousands)	Balance at December 31, 2017		Adjustments due to ASC 606			Balance at January 1, 2018
Assets:
Prepaid expenses and other	$	19,810	$	2,445	(a)	$	22,255
Liabilities:
Accounts payable and accrued liabilities		38,100		1,960			40,060
Stockholders’ equity:
Retained earnings		448,542		485			449,027

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

	Year Ended December 31, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments due to ASC 606			As Reported
Operating revenue	$	788,216	$	(622	)	$	787,594
Operating expenses:
Salaries, wages and benefits		252,327		(280	)		252,047
Purchased transportation		144,573		38			144,611
Fuel and fuel taxes		121,666		(33	)		121,633
Supplies and maintenance		40,832		21			40,853
Income taxes expense		16,121		(119	)		16,002
Net income		55,276		(249	)		55,027

	Balance at December 31, 2018
(In thousands)	Prior to Adoption of ASC 606		Adjustments due to ASC 606			As Reported
Assets:
Prepaid expenses and other	$	18,101	$	1,823	(a)	$	19,924
Liabilities:
Accounts payable and accrued liabilities		42,283		1,587			43,870
Stockholders’ equity:
Retained earnings		498,359		236			498,595

XML

Note 3 - Revenue and Business Segments (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

(Dollars in thousands)	201 8		2017		2016
Operating revenue:
Truckload revenue, net of fuel surcharge revenue	$	322,324	$	336,596	$	339,967
Truckload fuel surcharge revenue		53,016		43,614		35,884
Total Truckload revenue		375,340		380,210		375,851
Dedicated revenue, net of fuel surcharge revenue		187,137		153,691		147,007
Dedicated fuel surcharge revenue		36,715		13,190		10,363
Total Dedicated revenue		223,852		166,881		157,370
Intermodal revenue, net of fuel surcharge revenue		85,572		70,282		64,508
Intermodal fuel surcharge revenue		16,453		10,339		6,982
Total Intermodal revenue		102,025		80,621		71,490
Brokerage revenue		86,377		70,408		66,433
Total operating revenue	$	787,594	$	698,120	$	671,144
Operating income:
Truckload	$	35,067	$	26,326	$	27,438
Dedicated		18,589		17,074		19,550
Intermodal		11,150		8,303		7,131
Brokerage		5,542		5,159		4,184
Total operating income	$	70,348	$	56,862	$	58,303

XML

Note 4 - Details of Consolidated Balance Sheet Accounts (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

(In thousands)	201 8		2017
Tires in service	$	5,011	$	4,787
License fees		4,760		4,858
Parts and tires inventory		3,528		4,322
Insurance premiums		1,831		3,057
Contract assets		1,823		—
Other		2,971		2,786
	$	19,924	$	19,810

Schedule of Accrued Liabilities [Table Text Block]

(In thousands)	201 8		2017
Salaries and wages	$	9,744	$	4,171
Accrued expenses		7,091		8,212
Vacation		5,895		5,621
Accrued liability to MWL		1,222		1,765
Other		4,214		1,853
	$	28,166	$	21,622

XML

Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

(In thousands)	201 8			2017			2016
Current:
Federal	$	7,575		$	12,427		$	8,987
State		3,076			990			1,125
Total current		10,651			13,417			10,112
Deferred:
Federal		5,815			(48,424	)		12,427
State		(464	)		1,196			1,063
Total deferred		5,351			(47,228	)		13,490
Total expense (benefit)	$	16,002		$	(33,811	)	$	23,602

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	201 8			2017			2016
Federal statutory income tax rate		21	%		35	%		35	%
Per diem and other non-deductible expenses		2			4			4
Increase in taxes arising from state income taxes, net of federal income tax benefit		3			3			2
Federal tax credits		(2	)		(1	)		—
Decrease in federal deferred taxes due to decrease in statutory rate		—			(100	)		—
Other, net		(1	)		(1	)		—
Effective tax rate		23	%		(60	)%		41	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

(In thousands)	201 8		2017
Deferred tax assets:
Reserves and accrued liabilities	$	7,986	$	7,277
Other		2,313		1,965
		10,299		9,242
Deferred tax liabilities:
Depreciation		113,773		107,453
Prepaid expenses		2,503		2,415
		116,276		109,868
Net deferred tax liability	$	105,977	$	100,626

XML

Note 8 - Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

(In thousands, except per share amounts)	201 8		2017		2016
Numerator:
Net income	$	55,027	$	90,284	$	33,464
Denominator:
Basic earnings per common share - weighted-average shares		54,590		54,492		54,177
Effect of dilutive stock options		559		358		284
Diluted earnings per common share - weighted-average shares and assumed conversions		55,149		54,850		54,461
Basic earnings per common share	$	1.01	$	1.66	$	0.62
Diluted earnings per common share	$	1.00	$	1.65	$	0.61

XML

Note 14 - Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	201 8			2017			2016
Expected option life in years (1)		6.0			6.0			6.0
Expected stock price volatility percentage (2)		26	%		25	%		25	%
Risk-free interest rate percentage (3)		2.8	%		2.0	%		1.4	%
Expected dividend yield (4)		0.48	%		0.59	%		0.50	%
Fair value as of the date of grant	$	6.19		$	4.34		$	3.17

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2017		918,583		$	12.02
Granted		154,500			21.26
Exercised		(105,588	)		8.91
Forfeited		(28,302	)		15.66
Outstanding at December 31, 2018		939,193		$	13.78
Exercisable at December 31, 2018		545,713		$	11.49

Schedule of Nonvested Share Activity [Table Text Block]

	Shares			Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (in Years)
Nonvested at December 31, 2017		413,228		$	3.79		5.1
Granted		154,500			6.19		6.7
Vested		(146,546	)		3.73		3.4
Forfeited		(27,702	)		4.26		5.1
Nonvested at December 31, 2018		393,480		$	4.72		5.2

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Shares				Weighted Average Grant Date Fair Value
Nonvested at December 31, 2017		322,662			$	13.32
Granted		77,700				20.31
Vested		(182,481	)	(1)		14.55
Forfeited		(31,973	)			13.81
Nonvested at December 31, 2018		185,909			$	14.89

XML

Note 19 - Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Quarterly Financial Information [Table Text Block]

201 8 Quarters ( In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	186,960	$	197,024	$	199,649	$	203,961
Operating income		13,594		18,223		18,993		19,538
Net income		10,331		13,702		15,257		15,737
Basic earnings per common share		0.19		0.25		0.28		0.29
Diluted earnings per common share		0.19		0.25		0.28		0.29

201 7 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	173,159	$	171,511	$	170,679	$	182,771
Operating income		13,938		15,569		13,022		14,333
Net income		8,214		9,141		7,855		65,074
Net income – excluding deferred income taxes benefit (1)		8,214		9,141		7,855		8,609
Basic earnings per common share		0.15		0.17		0.14		1.19
Basic earnings per common share – excluding deferred income taxes benefit (1)		0.15		0.17		0.14		0.16
Diluted earnings per common share		0.15		0.17		0.14		1.18
Diluted earnings per common share – excluding deferred income taxes benefit (1)		0.15		0.17		0.14		0.16

XML

Schedule II - Valuation and Qualifying Accounts and Reserves (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Valuation Allowances and Reserves [Table Text Block]

	Balance at		Charged to
	Beginning of		Costs and						Balance at
Description	Year		Expenses		Deductions				End of Year
Insurance and claims accruals:
Year ended December 31, 2018	$	26,177	$	56,122	$	(54,196	)	(1)	$	28,103
Year ended December 31, 2017		19,440		53,609		(46,872	)	(1)		26,177
Year ended December 31, 2016		16,235		49,614		(46,409	)	(1)		19,440
Allowance for doubtful accounts:
Year ended December 31, 2018		300		163		(115	)	(2)		348
Year ended December 31, 2017		275		33		(8	)	(2)		300
Year ended December 31, 2016		305		88		(118	)	(2)		275

XML

Note 1 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)
Number of Operating Segments	5
Number of Dry Vans	1,600
Loss on Deposits Above FDIC Amount	$ 0
Letters of Credit Outstanding, Amount	$ 14,600,000	$ 12,900,000
Number of Reportable Segments	4
Assets, Total	$ 753,904,000	690,403,000
Liabilities, Total	$ 177,950,000	$ 164,903,000
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member]
Assets, Total				$ 1,000,000
Liabilities, Total				$ 1,000,000
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Walmart [Member]
Concentration Risk, Percentage	15.00%	19.00%	17.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | The Coca-Cola Company [Member]
Concentration Risk, Percentage	13.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | UNITED STATES
Concentration Risk, Percentage	99.00%	99.00%	99.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Walmart [Member]
Concentration Risk, Percentage	12.00%	15.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | The Coca-Cola Company [Member]
Concentration Risk, Percentage	7.00%
Uninsured Risk [Member] | Auto Liability Claim [Member]
Loss Contingency Range Possible Loss Per Claim	$ 1,000,000
Uninsured Risk [Member] | Workers Compensation Liability Claim [Member]
Loss Contingency Range Possible Loss Per Claim	750,000
Insurance Claims [Member]
Letters of Credit Outstanding, Amount	14,600,000
Supplies and Maintenance Costs [Member]
Amortization, Total	$ 7,000,000	$ 7,100,000	$ 6,900,000
Tractor [Member]
Replacement Of Equipment Period After Purchase	3 years 255 days
Property, Plant and Equipment, Useful Life	5 years
Property, Plant and Equipment, Salvage Value, Percentage	25.00%
Trailer [Member]
Replacement Of Equipment Period After Purchase	5 years 182 days
Property, Plant and Equipment, Useful Life	7 years
Property, Plant and Equipment, Salvage Value, Percentage	35.00%
Tires In Service [Member]
Property, Plant and Equipment, Useful Life		2 years

XML

Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2018
Tractor [Member]
Property, Plant and Equipment, Useful Life	5 years
Trailer [Member]
Property, Plant and Equipment, Useful Life	7 years
Service And Other Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Service And Other Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	15 years
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	20 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	40 years

XML

Note 2 - Adoption of New Accounting Standard (Details Textual)	12 Months Ended
	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 485,000
Number of Reportable Segments	4
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 485,000
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 485,000

XML

Note 2 - Adoption of New Accounting Standard - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Condensed Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets:
Prepaid expenses and other		$ 19,924	$ 22,255	$ 19,810
Liabilities:
Accounts payable and accrued liabilities		43,870	40,060	38,100
Stockholders’ equity:
Retained earnings		$ 498,595	$ 449,027	448,542
Accounting Standards Update 2014-09 [Member]
Assets:
Prepaid expenses and other	[1]			2,445
Liabilities:
Accounts payable and accrued liabilities				1,960
Stockholders’ equity:
Retained earnings				$ 485

[1] Contract assets balance at January 1, 2018.

XML

Note 2 - Adoption of New Accounting Standard - Impact of New Standard on Consolidated Condensed Balance Sheet and Statements of Operations (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Operating revenue										$ 787,594	$ 698,120	$ 671,144
Operating expenses (income):
Salaries, wages and benefits										252,047	226,091	224,827
Purchased transportation										144,611	118,349	110,719
Fuel and fuel taxes										121,633	105,390	94,075
Supplies and maintenance										40,853	41,613	43,912
Income Tax Expense (Benefit), Total										16,002	(33,811)	23,602
Net income		$ 15,737	$ 15,257	$ 13,702	$ 10,331	$ 65,074	$ 7,855	$ 9,141	$ 8,214	55,027	90,284	$ 33,464
Assets:
Prepaid expenses and other		19,924				19,810				19,924	19,810		$ 22,255
Contract assets		1,823								1,823
Liabilities:
Accounts payable and accrued liabilities		43,870				38,100				43,870	38,100		40,060
Stockholders’ equity:
Retained earnings		498,595				$ 448,542				498,595	$ 448,542		$ 449,027
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Operating revenue										788,216
Operating expenses (income):
Salaries, wages and benefits										252,327
Purchased transportation										144,573
Fuel and fuel taxes										121,666
Supplies and maintenance										40,832
Income Tax Expense (Benefit), Total										16,121
Net income										55,276
Assets:
Prepaid expenses and other		18,101								18,101
Liabilities:
Accounts payable and accrued liabilities		42,283								42,283
Stockholders’ equity:
Retained earnings		498,359								498,359
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Operating revenue										(622)
Operating expenses (income):
Salaries, wages and benefits										(280)
Purchased transportation										38
Fuel and fuel taxes										(33)
Supplies and maintenance										21
Income Tax Expense (Benefit), Total										(119)
Net income										(249)
Assets:
Contract assets	[1]	1,823								1,823
Liabilities:
Accounts payable and accrued liabilities		1,587								1,587
Stockholders’ equity:
Retained earnings		$ 236								$ 236

[1] Contract assets balance at December 31, 2018.

XML

Note 3 - Revenue and Business Segments (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Number of Operating Segments	5
Number of Reportable Segments	4
Customer Contract Term	1 year
Capitalized Contract Cost, Impairment Loss	$ 0
Dedicated [Member]
Depreciation, Depletion and Amortization, Total	$ 29,600	$ 22,000	$ 20,600
Dedicated [Member] | Minimum [Member]
Customer Contract Term	3 years
Dedicated [Member] | Maximum [Member]
Customer Contract Term	5 years
Truckload [Member]
Depreciation, Depletion and Amortization, Total	$ 52,200	57,200	56,200
Intermodal [Member]
Depreciation, Depletion and Amortization, Total	5,500	4,600	3,900
Brokerage [Member]
Depreciation, Depletion and Amortization, Total	$ 1,300	$ 1,300	$ 1,700

XML

Note 3 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating revenue	$ 203,961	$ 199,649	$ 197,024	$ 186,960	$ 182,771	$ 170,679	$ 171,511	$ 173,159	$ 787,594	$ 698,120	$ 671,144
Operating income:
Operating income	$ 19,538	$ 18,993	$ 18,223	$ 13,594	$ 14,333	$ 13,022	$ 15,569	$ 13,938	70,348	56,862	58,303
Truckload [Member]
Operating revenue									375,340	380,210	375,851
Operating income:
Operating income									35,067	26,326	27,438
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue									322,324	336,596	339,967
Truckload [Member] | Fuel Surcharge Revenue [Member]
Operating revenue									53,016	43,614	35,884
Dedicated [Member]
Operating revenue									223,852	166,881	157,370
Operating income:
Operating income									18,589	17,074	19,550
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue									187,137	153,691	147,007
Dedicated [Member] | Fuel Surcharge Revenue [Member]
Operating revenue									36,715	13,190	10,363
Intermodal [Member]
Operating revenue									102,025	80,621	71,490
Operating income:
Operating income									11,150	8,303	7,131
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member]
Operating revenue									85,572	70,282	64,508
Intermodal [Member] | Fuel Surcharge Revenue [Member]
Operating revenue									16,453	10,339	6,982
Brokerage [Member]
Operating revenue									86,377	70,408	66,433
Operating income:
Operating income									$ 5,542	$ 5,159	$ 4,184

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Note 4 - Details of Consolidated Balance Sheet Accounts - Prepaid Expenses and Other (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Insurance premiums	$ 1,831		$ 3,057
Contract assets	1,823
Other	2,971		2,786
	19,924	$ 22,255	19,810
Tires In Service [Member]
Prepaid expenses	5,011		4,787
License Fees Member [Member]
Prepaid expenses	4,760		4,858
Parts And Tires Inventory [Member]
Prepaid expenses	$ 3,528		$ 4,322

XML

Note 4 - Details of Consolidated Balance Sheet Accounts - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Salaries and wages	$ 9,744	$ 4,171
Accrued expenses	7,091	8,212
Vacation	5,895	5,621
Accrued liability to MWL	1,222	1,765
Other	4,214	1,853
	$ 28,166	$ 21,622

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Note 5 - Long-term Debt (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2018	Aug. 31, 2018	Jul. 31, 2018	Dec. 31, 2017
Line of Credit Facility, Maximum Borrowing Capacity		$ 30,000	$ 40,000
Long-term Line of Credit, Total	$ 0			$ 0
Letters of Credit Outstanding, Amount	14,600			$ 12,900
Line of Credit Facility, Remaining Borrowing Capacity	$ 15,400
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit	25.00%
Credit Facility [Member]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.20%

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Note 6 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts Payable, Related Parties	$ 0	$ 0
Purchase of Fuel, Tires and Related Services [Member]
Related Party Transaction, Amounts of Transaction	341,000	328,000	$ 361,000
Tire Purchases [Member]
Related Party Transaction, Amounts of Transaction	$ 2,500,000	$ 2,500,000	$ 2,000,000

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Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ (56,500,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Deferred Income Tax Expense (Benefit), Excluding Effective Changes in Tax Rate		$ 8,000,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Excluding Changes in Tax Rate, Percent		40.10%
Unrecognized Tax Benefits, Ending Balance	$ 1,900,000	$ 407,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	1,500,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,800,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	$ 12,000	$ 11,000

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Note 7 - Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 7,575	$ 12,427	$ 8,987
State	3,076	990	1,125
Total current	10,651	13,417	10,112
Deferred:
Federal	5,815	(48,424)	12,427
State	(464)	1,196	1,063
Total deferred	5,351	(47,228)	13,490
Total expense (benefit)	$ 16,002	$ (33,811)	$ 23,602

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Note 7 - Income Taxes - Federal Income Tax Reconciled to the Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Per diem and other non-deductible expenses	2.00%	4.00%	4.00%
Increase in taxes arising from state income taxes, net of federal income tax benefit	3.00%	3.00%	2.00%
Federal tax credits	(2.00%)	(1.00%)
Decrease in federal deferred taxes due to decrease in statutory rate		(100.00%)
Other, net	(1.00%)	(1.00%)
Effective tax rate	23.00%	(60.00%)	41.00%

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Note 7 - Income Taxes - Net Deferred Tax Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Reserves and accrued liabilities	$ 7,986	$ 7,277
Other	2,313	1,965
	10,299	9,242
Deferred tax liabilities:
Depreciation	113,773	107,453
Prepaid expenses	2,503	2,415
	116,276	109,868
Net deferred tax liability	$ 105,977	$ 100,626

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Note 8 - Earnings Per Common Share (Details Textual) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	153,500	145,169	564,833
Unvested Performance Unit Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,638	124,046	64,162

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Note 8 - Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income	$ 15,737	$ 15,257	$ 13,702	$ 10,331	$ 65,074	$ 7,855	$ 9,141	$ 8,214	$ 55,027	$ 90,284	$ 33,464
Denominator:
Basic earnings per common share - weighted-average shares (in shares)									54,590	54,492	54,177
Effect of dilutive stock options (in shares)									559	358	284
Diluted earnings per common share - weighted-average shares and assumed conversions (in shares)									55,149	54,850	54,461
Basic earnings per common share (in dollars per share)	$ 0.29	$ 0.28	$ 0.25	$ 0.19	$ 1.19	$ 0.14	$ 0.17	$ 0.15	$ 1.01	$ 1.66	$ 0.62
Diluted earnings per common share (in dollars per share)	$ 0.29	$ 0.28	$ 0.25	$ 0.19	$ 1.18	$ 0.14	$ 0.17	$ 0.15	$ 1	$ 1.65	$ 0.61

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Note 9 - Stock Split (Details Textual) - $ / shares	Jul. 07, 2017	Dec. 31, 2018	May 31, 2018	Dec. 31, 2017
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Stock Issued During Period, Percentage of Shares, Stock Split	66.67%
Stock Split from [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	5
Stock Split To [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	3

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Note 10 - Share Repurchase Program (Details Textual) $ in Thousands		3 Months Ended		12 Months Ended
	Jul. 07, 2017	Dec. 31, 2018 USD ($) shares	Mar. 31, 2016 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 shares	Dec. 31, 2016 USD ($)	Aug. 15, 2017 shares	Nov. 04, 2015 USD ($) shares	Dec. 31, 2007 shares
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares		806,000		806,000			3,300,000	2,000,000	1,000,000
Stock Repurchase Program, Authorized Amount | $		$ 12,600		$ 12,600				$ 40,000
Stock Repurchased and Retired During Period, Shares | shares		200,000	759,302		0
Stock Repurchased and Retired During Period, Value | $		$ 3,800	$ 7,500	$ 3,756		$ 7,513
Stock Split from [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	5
Stock Split To [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	3

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Note 11 - Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Payments of Ordinary Dividends, Common Stock					$ 5,459	$ 4,361	$ 3,252
Paid Quarterly [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.025	$ 0.025	$ 0.015	$ 0.015	$ 0.025		$ 0.015

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Note 12 - Third Amendment to Amended and Restated Certificate of Incorporation (Details Textual) - $ / shares	Dec. 31, 2018	May 31, 2018	Apr. 30, 2018	Dec. 31, 2017	Jul. 07, 2017
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01		$ 0.01	$ 0.01
Common Stock, Shares Authorized	192,000,000	192,000,000	96,000,000	96,000,000

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Note 13 - Equity Investment (Details Textual) - M W L [Member] - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investment, Ownership Percentage	45.00%
Equity Method Investment, Ownership Percentage by Non-related Party	55.00%
Revenue from Related Parties	$ 5,500,000	$ 2,200,000	$ 1,200,000
Due to Affiliate	1,200,000
Trade Accounts Receivable [Member]
Due from Affiliates	$ 630,000

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Note 14 - Employee Benefits (Details Textual) - USD ($)	1 Months Ended											12 Months Ended			37 Months Ended
	Dec. 31, 2018	Aug. 31, 2018	May 31, 2018	Aug. 31, 2017	May 31, 2017	Aug. 31, 2016	May 31, 2016	May 31, 2015	May 31, 2014	May 31, 2013	May 31, 2012	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted												998,022
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,333,333											1,333,333
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate Of Unvested Outstanding Awards												1.25%
Allocated Share-based Compensation Expense, Total												$ 3,323,000	$ 1,250,000	$ 883,000
Allocated Share-based Compensation Expense, Net of Tax												$ 2,600,000	$ 738,000	$ 547,000
Allocated Share Based Compensation Expense Net Of Tax Amount Per Basic And Diluted Share												$ 0.05	$ 0.01	$ 0.01
Income Tax Expense (Benefit), Total												$ 16,002,000	$ (33,811,000)	$ 23,602,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance	939,193											939,193	918,583
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term												3 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 3,000,000											$ 3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	545,713											545,713
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term												2 years 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 2,600,000											$ 2,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value												1,500,000	$ 830,000	1,900,000
Proceeds from Stock Options Exercised												938,000	1,100,000	4,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value												$ 547,000	515,000	$ 534,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability													$ (56,500,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent												21.00%	35.00%	35.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match												35.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay												6.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage												20.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount												$ 0	$ 0	$ 0
Defined Contribution Plan, Cost												2,300,000	2,100,000	2,100,000
Retirement Savings Plan, Participants Less Than 50 Years Old [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount												18,500
Retirement Savings Plan, Participants Over50 Years Old [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount												24,500
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit), Total												$ 319,000	176,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period												5 years			5 years
Share-based Compensation Arrangement By Share-based Payment Awards, Annual Service Vesting Percentage															5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value												$ 2,700,000
Performance Shares [Member] | One Half of Awards Paid Immediately Upon Vesting and One Half Credited to Employees' Accounts [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			45,700		109,169		57,669	58,335	60,668	104,250	98,750
Share-based Compensation Arrangement By Share-based Payment Awards, Annual Service Vesting Percentage					10.00%
Performance Shares [Member] | Awards Paid to Employees Upon Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	2,000	2,000	28,000	2,000	43,342	1,667	21,671	32,500	18,337
Unvested Service Based Option Awards [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 1,600,000											$ 1,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition												3 years 73 days
Unvested Performance Unit Awards [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 2,400,000											$ 2,400,000
Service Based Options [Member]
Stock Granted, Value, Share-based Compensation, Gross												$ 957,000	$ 592,000	$ 227,000
Two Thousand and Fifteen Plan [Member] | Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award Annual Percentage Of Award Which Vests												20.00%
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Reserved For Issuance Under Awards Outstanding	568,873											568,873
Two Thousand and Fifteen Plan [Member] | Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Reserved For Issuance Under Awards Outstanding	349,814											349,814
Two Thousand And Five Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	0											0
Two Thousand And Five Plan [Member] | Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Reserved For Issuance Under Awards Outstanding	370,320											370,320
Two Thousand And Five Plan [Member] | Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Reserved For Issuance Under Awards Outstanding	0											0
Minimum [Member] | Two Thousand and Fifteen Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period												7 years
Maximum [Member] | Two Thousand and Fifteen Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period												10 years

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Note 14 - Employee Benefits - Stock Options Valuation Assumptions (Details) - $ / shares		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Expected option life in years(1) (Year)	[1]	6 years	6 years	6 years
Expected stock price volatility percentage(2)	[2]	26.00%	25.00%	25.00%
Risk-free interest rate percentage(3)	[3]	2.80%	2.00%	1.40%
Expected dividend yield(4)	[4]	0.48%	0.59%	0.50%
Fair value as of the date of grant (in dollars per share)		$ 6.19	$ 4.34	$ 3.17

[1] Expected option life - We use historical employee exercise and option expiration data to estimate the expected life assumption for the Black-Scholes grant-date valuation. We believe that this historical data is currently the best estimate of the expected term of a new option. We use a weighted-average expected life for all awards.

[2] Expected stock price volatility - We use our stock's historical volatility for the same period of time as the expected life. We have no reason to believe that its future volatility will differ from the past.

[3] Risk-free interest rate - The rate is based on the U.S. Treasury yield curve in effect at the time of the grant for the same period of time as the expected life.

[4] Expected dividend yield - The calculation is based on the total expected annual dividend payout divided by the average stock price.

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Note 14 - Employee Benefits - Option Activity (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Balance (in shares) | shares	918,583
Balance (in dollars per share) | $ / shares	$ 12.02
Granted (in shares) | shares	154,500
Granted (in dollars per share) | $ / shares	$ 21.26
Exercised (in shares) | shares	(105,588)
Exercised (in dollars per share) | $ / shares	$ 8.91
Forfeited (in shares) | shares	(28,302)
Forfeited (in dollars per share) | $ / shares	$ 15.66
Balance (in shares) | shares	939,193
Balance (in dollars per share) | $ / shares	$ 13.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	545,713
Exercisable at December 31, 2018 (in dollars per share) | $ / shares	$ 11.49

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Note 14 - Employee Benefits - Non-vested Option Awards Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Granted (in shares)	154,500
Granted (in dollars per share)	$ 6.19	$ 4.34	$ 3.17
Forfeited (in shares)	(28,302)
Service Based Options [Member]
Balance at beginning of period, nonvested (in shares)	413,228
Weighted average grant date fair value, beginning of period, nonvested (in dollars per share)	$ 3.79
Nonvested Contractual Life (Year)	5 years 73 days	5 years 36 days
Granted (in shares)	154,500
Granted (in dollars per share)	$ 6.19
Granted (Year)	6 years 255 days
Vested (in shares)	(146,546)
Vested (in dollars per share)	$ 3.73
Vested (Year)	3 years 146 days
Forfeited (in shares)	(27,702)
Forfeited (in dollars per share)	$ 4.26
Forfeited (Year)	5 years 36 days
Balance at end of period, nonvested (in shares)	393,480	413,228
Weighted average grant date fair value, end of period, nonvested (in dollars per share)	$ 4.72	$ 3.79

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Note 14 - Employee Benefits - Non-vested Performance Unit Award Activity (Details) - Performance Shares [Member]	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Nonvested (in shares) | shares	322,662
Nonvested (in dollars per share) | $ / shares	$ 13.32
Granted (in shares) | shares	77,700
Granted (in dollars per share) | $ / shares	$ 20.31
Vested (in shares) | shares	(182,481)	[1]
Vested (in dollars per share) | $ / shares	$ 14.55
Forfeited (in shares) | shares	(31,973)
Forfeited (in dollars per share) | $ / shares	$ 13.81
Nonvested (in shares) | shares	185,909
Nonvested (in dollars per share) | $ / shares	$ 14.89

[1] This number of performance unit award shares vested based on our financial performance in 2018 and was distributed or credited to the Marten Transport, Ltd. Deferred Compensation Plan in February 2019. As permitted in the performance unit award agreements granted in 2014 and 2015, the Compensation Committee of our Board of Directors adjusted the calculation of the performance vesting component for 2018 to be based on our increase in net income instead of our increase in diluted net income per share. Additionally, the $56.5 million deferred income taxes benefit in 2017 related to the federal Tax Cuts and Jobs Act of 2017 was excluded from the calculation of the increase in net income from 2017 to 2018. The calculation of the increase in net income also included an adjustment of 2017 net income to reflect a federal income tax rate of 21% instead of 35%, to be consistent with the federal rate in 2018. The fair value of unit award shares that vested in 2018 was $2.7 million.

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Note 15 - Excess Tax Benefit Reclassification (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Cash Provided by (Used in) Operating Activities, Total	$ 150,623,000	$ 121,879,000	$ 133,801,000
Net Cash Provided by (Used in) Financing Activities, Total	$ (8,381,000)	$ (11,258,000)	(36,457,000)
Accounting Standards Update 2016-09 [Member]
Net Cash Provided by (Used in) Operating Activities, Total			235,000
Net Cash Provided by (Used in) Financing Activities, Total			$ 235,000

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Note 16 - Deferred Compensation Plan (Details Textual) - 2015 Equity Incentive Plan [Member] $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) shares
Deferred Compensation Arrangement with Individual, Shares Issued | shares	241,348
Deferred Compensation Arrangement with Individual, Compensation Expense | $	$ 3.9

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Note 18 - Commitments and Contingencies (Details Textual)	Dec. 31, 2018 USD ($)
Operating Leases, Future Minimum Payments Due, Total	$ 672,000
Capital Addition Purchase Commitments [Member] | Revenue Equipment [Member]
Purchase Obligation, Future Minimum Payments, Remainder of Fiscal Year	$ 91,100,000

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Note 19 - Quarterly Financial Data (Unaudited) (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ (56,500,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%

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Note 19 - Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating revenue		$ 203,961	$ 199,649	$ 197,024	$ 186,960	$ 182,771	$ 170,679	$ 171,511	$ 173,159	$ 787,594	$ 698,120	$ 671,144
Operating income		19,538	18,993	18,223	13,594	14,333	13,022	15,569	13,938	70,348	56,862	58,303
Net income		$ 15,737	$ 15,257	$ 13,702	$ 10,331	$ 65,074	$ 7,855	$ 9,141	$ 8,214	$ 55,027	$ 90,284	$ 33,464
Basic earnings per common share (in dollars per share)		$ 0.29	$ 0.28	$ 0.25	$ 0.19	$ 1.19	$ 0.14	$ 0.17	$ 0.15	$ 1.01	$ 1.66	$ 0.62
Diluted earnings per common share (in dollars per share)		$ 0.29	$ 0.28	$ 0.25	$ 0.19	$ 1.18	$ 0.14	$ 0.17	$ 0.15	$ 1	$ 1.65	$ 0.61
Net income – excluding deferred income taxes benefit(1)	[1]					$ 8,609	$ 7,855	$ 9,141	$ 8,214
Basic earnings per common share – excluding deferred income taxes benefit(1) (in dollars per share)	[1]					$ 0.16	$ 0.14	$ 0.17	$ 0.15
Diluted earnings per common share – excluding deferred income taxes benefit(1) (in dollars per share)	[1]					$ 0.16	$ 0.14	$ 0.17	$ 0.15

[1] The amounts are presented for comparative purposes excluding the $56.5 million deferred income taxes benefit recorded to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017.

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Schedule II - Valuation and Qualifying Accounts and Reserves - Valuation Allowances and Reserves (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Insurance and Claims Accruals [Member]
Balance at Beginning of Year		$ 26,177	$ 19,440	$ 16,235
Charged to Costs and Expenses		56,122	53,609	49,614
Deductions	[1]	(54,196)	(46,872)	(46,409)
Balance at End of Year		28,103	26,177	19,440
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance at Beginning of Year		300	275	305
Charged to Costs and Expenses		163	33	88
Deductions	[2]	(115)	(8)	(118)
Balance at End of Year		$ 348	$ 300	$ 275

[1] Claims payments

[2] Write-off of bad debts, net of recoveries