ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Policies)	6 Months Ended
Jun. 30, 2019
ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION
Financial Statement Presentation	Financial Statement Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) pertaining to interim financial information. Accordingly, these interim financial statements do not include all information or footnote disclosures required by accounting principles generally accepted in the United States for complete financial statements and, therefore, should be read in conjunction with the audited financial statements and accompanying notes included in the Company’s 2018 Annual Report on Form 10-K and other current filings with the SEC. In the opinion of management, all adjustments (which are of a normal and recurring nature) considered necessary for a fair presentation have been included. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual amounts may differ from those estimates.
Interest Rate Swap Derivative Instruments	Interest Rate Swap Derivative Instruments: The Company accounts for its derivative instruments as either assets or liabilities and carries them at fair value. The Company has interest rate swap agreements designated as cash flow hedges. The effective portion of the gain or loss on the interest rate swap instruments is reported as unrealized gain or loss as a component of accumulated other comprehensive income or loss, net of tax, in stockholders’ equity and the change in the unrealized gain or loss on the interest rate swaps is reported in other comprehensive income or loss, net of tax, in the consolidated statements of comprehensive income. The unrealized gain or loss is reclassified out of accumulated other comprehensive loss into income in the same period or periods during which the hedged transaction affects earnings. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions.
Leases	Leases: The Company leases, under finance and operating lease arrangements, certain facilities used primarily in the Asset-Based segment service center operations, certain revenue equipment used in the ArcBest segment operations, and certain other office equipment. The Company adopted Accounting Standards Codification (“ASC”) Topic 842, Leases, (“ASC Topic 842”) effective January 1, 2019. In accordance with ASC Topic 842, right-of-use assets and lease liabilities for operating leases are recorded on the balance sheet and the related lease expense is recorded on a straight-line basis over the lease term in operating expenses. Included in lease expense are any variable lease payments incurred in the period that were not included in the initial lease liability. For financial reporting purposes, right-of-use assets held under finance leases are amortized over their estimated useful lives on the same basis as owned assets, and leasehold improvements associated with assets utilized under finance or operating leases are amortized by the straight-line method over the shorter of the remaining lease term or the asset’s useful life. Amortization of assets under finance leases is included in depreciation expense. Obligations under the finance lease arrangements are included in long-term debt. The short-term lease exemption was elected under ASC Topic 842 for all classes of assets to include real property, revenue equipment, and service, office, and other equipment. The Company adopted the policy election as a lessee for all classes of assets to account for each lease component and its related non-lease component(s) as a single lease component. In determining the discount rate, the Company uses the rate implicit in the lease if that rate is readily determinable when entering into a lease as a lessee. If the rate implicit in the lease is not readily determinable, the Company uses its incremental borrowing rate, determined by the price of a fully collateralized loan with similar terms based on current market rates. For contracts entered into on or after the effective date, an assessment is made as to whether the contract is, or contains, a lease at the inception of a contract. The assessment is based on: (1) whether the contract involves the use of a distinct identified asset; (2) whether the Company obtains the right to substantially all the economic benefit from the use of the asset throughout the period; and (3) whether the Company has the right to direct the use of the asset. For all operating leases that meet the scope of ASC Topic 842, a right-of-use asset and a lease liability are recognized. The right-of-use asset is measured as the initial amount of the lease liability, plus any initial direct costs incurred, less any prepayments prior to commencement or lease incentives received. The lease liability is initially measured at the present value of the lease payments, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, the Company’s secured incremental borrowing rate for the same term as the underlying lease. Lease payments included in the measurement of the lease liability are comprised of the following: (1) the fixed noncancelable lease payments, (2) payments for optional renewal periods where it is reasonably certain the renewal period will be exercised, and (3) payments for early termination options unless it is reasonably certain the lease will not be terminated early. Variable lease payments based on an index or rate are initially measured using the index or rate in effect at lease commencement and included in the measurement of the initial lease liability. Additional payments based on the change in an index or rate are recorded as a period expense when incurred. Lease modifications result in remeasurement of the lease liability.
Accounting Pronouncements	Adopted Accounting Pronouncements ASC Topic 842, which was adopted by the Company effective January 1, 2019, requires lessees to recognize right-of-use assets and lease liabilities for operating leases with terms greater than 12 months on the balance sheet. The standard also requires additional qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. The Company elected the modified retrospective method of applying the transition provisions at the beginning of the period of adoption and, as a result, has not adjusted comparative period financial information and has not included the new lease disclosures for periods before the effective date. Prior period amounts continue to be reported under the Company’s historical accounting in accordance with the previous lease guidance included in ASC Topic 840. The Company has excluded short-term leases from accounting under ASC Topic 842 and has elected the package of practical expedients as permitted under the transition guidance, which allowed the Company to not reassess: (1) whether contracts are, or contain, leases; (2) lease classification; and (3) capitalization of initial direct costs. For contracts entered into on or after the effective date, an assessment is made as to whether the contract is, or contains, a lease at the inception of a contract. Consistent with the package of practical expedients elected, leases entered into prior to January 1, 2019, are accounted for under ASC Topic 840 and were not reassessed. For all classes of assets, the policy election was made to account for each lease component and its related non-lease component(s) as a single lease component. The election to not recognize right-of-use assets and lease liabilities for short-term leases that have a term of 12 months or less did not have a material effect on the right-of-use assets and lease liabilities. The majority of the Company’s lease portfolio consists of real property operating leases related to facilities used in the Asset-Based segment service center operations. The lease portfolio also includes operating leases related to certain revenue equipment used in the ArcBest segment operations as well as a small number of office equipment finance leases. Management has recorded the right-of-use assets and associated lease liabilities for operating leases on the consolidated balance sheet as of June 30, 2019 in accordance with ASC Topic 842. Finance leases are not material to the consolidated financial statements. The most significant impact of adopting ASC Topic 842 was the recognition of right-of-use assets and lease liabilities on the balance sheet for operating leases of $58.7 million as of January 1, 2019. The accounting for finance leases (formerly referred to as capital leases prior to the adoption of ASC Topic 842) remained substantially unchanged. The expense recognition for operating leases and finance leases under ASC Topic 842 is substantially consistent with ASC Topic 840 and the impact of the new standard is non-cash in nature. As a result, there is no significant impact on the Company’s results of operations or cash flows presented in the Company’s consolidated financial statements. ASC Topic 815, Derivatives and Hedging, which was adopted by the Company on January 1, 2019, was amended to change the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results to simplify hedge accounting treatment and better align an entity’s risk management activities and financial reporting for hedging relationships. ASC Topic 815, as amended, also allows for the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a U.S. benchmark interest rate. The amendment did not have an impact on the consolidated financial statements. The U.S. Securities and Exchange Commission (the “SEC”) issued Final Rule 33-10618, FAST Act Modernization and Simplification of Regulation S-K, (“Final Rule 33-10618”) in March 2019 to modernize and simplify certain disclosure requirements in Regulation S-K and the related rules and forms. Effective April 2, 2019, the final rule allows registrants to redact confidential information from most exhibits filed with the SEC without filing a confidential treatment request. Effective May 2, 2019, the final rule requires registrants to include the trading symbol for each class of registered securities on the cover page of certain SEC forms. The eXtensible Business Reporting Language (“XBRL”) reporting requirements of the final rule for tagging data on the cover page of certain SEC filings and the use of hyperlinks for information that is incorporated by reference and available on EDGAR became effective for the Company with this Quarterly Report on Form 10-Q. Accounting Pronouncements Not Yet Adopted Final Rule 33-10618 includes certain provisions to simplify certain annual disclosure requirements within the Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”), Risk Factors, and Properties sections of Form 10-K. These provisions, which the Company will adopt for its 2019 Annual Report on Form 10-K, are not expected to have a significant impact on the Company’s consolidated financial statement disclosures. ASC Subtopic 350-40, Intangibles – Goodwill and Other – Internal-Use Software: Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement, (“ASC Subtopic 350-40”) was amended by the FASB in August 2018 and is effective for the Company beginning January 1, 2020. The amendments to ASC Subtopic 350-40 clarify the accounting treatment for implementation costs incurred by the customer in a cloud computing software arrangement. The amendments allow implementation costs of cloud computing arrangements to be capitalized using the same method prescribed by ASC Subtopic 350-40, Internal-Use Software. The amendments to ASC Subtopic 350-40 will be adopted on a prospective basis and are not expected to have an impact on the Company’s consolidated financial statements. ASC Topic 820, Fair Value Measurement, was amended to modify the disclosure requirements of fair value measurements, primarily impacting the disclosures for Level 3 fair value measurements. The amendment is effective for the Company beginning January 1, 2020 and is not expected to have a significant impact on the Company’s financial statement disclosures. ASC Topic 326, Financial Instruments – Credit Losses, (“ASC Topic 326”), was amended to improve the measurement of credit losses on financial instruments, including trade accounts receivable. The amendment is effective for the Company beginning January 1, 2020 and is not expected to have a significant impact on the Company’s consolidated financial statements. Management believes there is no other new accounting guidance issued but not yet effective that is relevant to the Company’s current financial statements.

ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Policies)

6 Months Ended

Jun. 30, 2019

ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION

Financial Statement Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) pertaining to interim financial information. Accordingly, these interim financial statements do not include all information or footnote disclosures required by accounting principles generally accepted in the United States for complete financial statements and, therefore, should be read in conjunction with the audited financial statements and accompanying notes included in the Company’s 2018 Annual Report on Form 10-K and other current filings with the SEC. In the opinion of management, all adjustments (which are of a normal and recurring nature) considered necessary for a fair presentation have been included.

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual amounts may differ from those estimates.

Interest Rate Swap Derivative Instruments

Interest Rate Swap Derivative Instruments: The Company accounts for its derivative instruments as either assets or liabilities and carries them at fair value. The Company has interest rate swap agreements designated as cash flow hedges. The effective portion of the gain or loss on the interest rate swap instruments is reported as unrealized gain or loss as a component of accumulated other comprehensive income or loss, net of tax, in stockholders’ equity and the change in the unrealized gain or loss on the interest rate swaps is reported in other comprehensive income or loss, net of tax, in the consolidated statements of comprehensive income. The unrealized gain or loss is reclassified out of accumulated other comprehensive loss into income in the same period or periods during which the hedged transaction affects earnings. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions.

Leases

Leases: The Company leases, under finance and operating lease arrangements, certain facilities used primarily in the Asset-Based segment service center operations, certain revenue equipment used in the ArcBest segment operations, and certain other office equipment. The Company adopted Accounting Standards Codification (“ASC”) Topic 842, Leases, (“ASC Topic 842”) effective January 1, 2019. In accordance with ASC Topic 842, right-of-use assets and lease liabilities for operating leases are recorded on the balance sheet and the related lease expense is recorded on a straight-line basis over

the lease term in operating expenses. Included in lease expense are any variable lease payments incurred in the period that were not included in the initial lease liability. For financial reporting purposes, right-of-use assets held under finance leases are amortized over their estimated useful lives on the same basis as owned assets, and leasehold improvements associated with assets utilized under finance or operating leases are amortized by the straight-line method over the shorter of the remaining lease term or the asset’s useful life. Amortization of assets under finance leases is included in depreciation expense. Obligations under the finance lease arrangements are included in long-term debt.

The short-term lease exemption was elected under ASC Topic 842 for all classes of assets to include real property, revenue equipment, and service, office, and other equipment. The Company adopted the policy election as a lessee for all classes of assets to account for each lease component and its related non-lease component(s) as a single lease component. In determining the discount rate, the Company uses the rate implicit in the lease if that rate is readily determinable when entering into a lease as a lessee. If the rate implicit in the lease is not readily determinable, the Company uses its incremental borrowing rate, determined by the price of a fully collateralized loan with similar terms based on current market rates.

For contracts entered into on or after the effective date, an assessment is made as to whether the contract is, or contains, a lease at the inception of a contract. The assessment is based on: (1) whether the contract involves the use of a distinct identified asset; (2) whether the Company obtains the right to substantially all the economic benefit from the use of the asset throughout the period; and (3) whether the Company has the right to direct the use of the asset. For all operating leases that meet the scope of ASC Topic 842, a right-of-use asset and a lease liability are recognized. The right-of-use asset is measured as the initial amount of the lease liability, plus any initial direct costs incurred, less any prepayments prior to commencement or lease incentives received. The lease liability is initially measured at the present value of the lease payments, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, the Company’s secured incremental borrowing rate for the same term as the underlying lease. Lease payments included in the measurement of the lease liability are comprised of the following: (1) the fixed noncancelable lease payments, (2) payments for optional renewal periods where it is reasonably certain the renewal period will be exercised, and (3) payments for early termination options unless it is reasonably certain the lease will not be terminated early. Variable lease payments based on an index or rate are initially measured using the index or rate in effect at lease commencement and included in the measurement of the initial lease liability. Additional payments based on the change in an index or rate are recorded as a period expense when incurred. Lease modifications result in remeasurement of the lease liability.

Accounting Pronouncements

Adopted Accounting Pronouncements

ASC Topic 842, which was adopted by the Company effective January 1, 2019, requires lessees to recognize right-of-use assets and lease liabilities for operating leases with terms greater than 12 months on the balance sheet. The standard also requires additional qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. The Company elected the modified retrospective method of applying the transition provisions at the beginning of the period of adoption and, as a result, has not adjusted comparative period financial information and has not included the new lease disclosures for periods before the effective date. Prior period amounts continue to be reported under the Company’s historical accounting in accordance with the previous lease guidance included in ASC Topic 840.

The Company has excluded short-term leases from accounting under ASC Topic 842 and has elected the package of practical expedients as permitted under the transition guidance, which allowed the Company to not reassess: (1) whether contracts are, or contain, leases; (2) lease classification; and (3) capitalization of initial direct costs. For contracts entered into on or after the effective date, an assessment is made as to whether the contract is, or contains, a lease at the inception of a contract. Consistent with the package of practical expedients elected, leases entered into prior to January 1, 2019, are accounted for under ASC Topic 840 and were not reassessed. For all classes of assets, the policy election was made to account for each lease component and its related non-lease component(s) as a single lease component. The election to not recognize right-of-use assets and lease liabilities for short-term leases that have a term of 12 months or less did not have a material effect on the right-of-use assets and lease liabilities.

The majority of the Company’s lease portfolio consists of real property operating leases related to facilities used in the Asset-Based segment service center operations. The lease portfolio also includes operating leases related to certain revenue equipment used in the ArcBest segment operations as well as a small number of office equipment finance leases. Management has recorded the right-of-use assets and associated lease liabilities for operating leases on the consolidated

balance sheet as of June 30, 2019 in accordance with ASC Topic 842. Finance leases are not material to the consolidated financial statements.

The most significant impact of adopting ASC Topic 842 was the recognition of right-of-use assets and lease liabilities on the balance sheet for operating leases of $58.7 million as of January 1, 2019. The accounting for finance leases (formerly referred to as capital leases prior to the adoption of ASC Topic 842) remained substantially unchanged. The expense recognition for operating leases and finance leases under ASC Topic 842 is substantially consistent with ASC Topic 840 and the impact of the new standard is non-cash in nature. As a result, there is no significant impact on the Company’s results of operations or cash flows presented in the Company’s consolidated financial statements.

ASC Topic 815, Derivatives and Hedging, which was adopted by the Company on January 1, 2019, was amended to change the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results to simplify hedge accounting treatment and better align an entity’s risk management activities and financial reporting for hedging relationships. ASC Topic 815, as amended, also allows for the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a U.S. benchmark interest rate. The amendment did not have an impact on the consolidated financial statements.

The U.S. Securities and Exchange Commission (the “SEC”) issued Final Rule 33-10618, FAST Act Modernization and Simplification of Regulation S-K, (“Final Rule 33-10618”) in March 2019 to modernize and simplify certain disclosure requirements in Regulation S-K and the related rules and forms. Effective April 2, 2019, the final rule allows registrants to redact confidential information from most exhibits filed with the SEC without filing a confidential treatment request. Effective May 2, 2019, the final rule requires registrants to include the trading symbol for each class of registered securities on the cover page of certain SEC forms. The eXtensible Business Reporting Language (“XBRL”) reporting requirements of the final rule for tagging data on the cover page of certain SEC filings and the use of hyperlinks for information that is incorporated by reference and available on EDGAR became effective for the Company with this Quarterly Report on Form 10-Q.

Accounting Pronouncements Not Yet Adopted

Final Rule 33-10618 includes certain provisions to simplify certain annual disclosure requirements within the Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”), Risk Factors, and Properties sections of Form 10-K. These provisions, which the Company will adopt for its 2019 Annual Report on Form 10-K, are not expected to have a significant impact on the Company’s consolidated financial statement disclosures.

ASC Subtopic 350-40, Intangibles – Goodwill and Other – Internal-Use Software: Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement, (“ASC Subtopic 350-40”) was amended by the FASB in August 2018 and is effective for the Company beginning January 1, 2020. The amendments to ASC Subtopic 350-40 clarify the accounting treatment for implementation costs incurred by the customer in a cloud computing software arrangement. The amendments allow implementation costs of cloud computing arrangements to be capitalized using the same method prescribed by ASC Subtopic 350-40, Internal-Use Software. The amendments to ASC Subtopic 350-40 will be adopted on a prospective basis and are not expected to have an impact on the Company’s consolidated financial statements.

ASC Topic 820, Fair Value Measurement, was amended to modify the disclosure requirements of fair value measurements, primarily impacting the disclosures for Level 3 fair value measurements. The amendment is effective for the Company beginning January 1, 2020 and is not expected to have a significant impact on the Company’s financial statement disclosures.

ASC Topic 326, Financial Instruments – Credit Losses, (“ASC Topic 326”), was amended to improve the measurement of credit losses on financial instruments, including trade accounts receivable. The amendment is effective for the Company beginning January 1, 2020 and is not expected to have a significant impact on the Company’s consolidated financial statements.

Management believes there is no other new accounting guidance issued but not yet effective that is relevant to the Company’s current financial statements.