ArcBest (ARCB) 10-Q 6 Aug 21 2021 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	000-19969
Entity Registrant Name	ARCBEST CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	71-0673405
Entity Address, Address Line One	8401 McClure Drive
Entity Address, City or Town	Fort Smith
Entity Address, State or Province	AR
Entity Address, Postal Zip Code	72916
City Area Code	479
Local Phone Number	785-6000
Title of 12(b) Security	Common Stock
Trading Symbol	ARCB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		25,557,575
Entity Central Index Key	0000894405
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 362,619	$ 303,954
Short-term investments	59,967	65,408
Accounts receivable, less allowances (2021 - $7,396; 2020 - $7,851)	360,498	320,870
Other accounts receivable, less allowances (2021 - $667; 2020 - $660)	13,284	14,343
Prepaid expenses	36,355	37,774
Prepaid and refundable income taxes	5,871	11,397
Other	4,937	4,422
TOTAL CURRENT ASSETS	843,531	758,168
PROPERTY, PLANT AND EQUIPMENT
Land and structures	345,829	342,178
Revenue equipment	933,264	916,760
Service, office, and other equipment	239,462	233,810
Software	170,528	163,193
Leasehold improvements	15,835	15,156
TOTAL PROPERTY, PLANT AND EQUIPMENT, Gross	1,704,918	1,671,097
Less allowances for depreciation and amortization	1,038,974	992,407
PROPERTY, PLANT AND EQUIPMENT, net	665,944	678,690
GOODWILL	86,368	88,320
INTANGIBLE ASSETS, net	53,084	54,981
OPERATING RIGHT-OF-USE ASSETS	109,860	115,195
DEFERRED INCOME TAXES	6,419	6,158
OTHER LONG-TERM ASSETS	76,267	77,496
TOTAL ASSETS	1,841,473	1,779,008
CURRENT LIABILITIES
Accounts payable	204,124	170,898
Income taxes payable	7,357	316
Accrued expenses	260,185	246,746
Current portion of long-term debt	66,644	67,105
Current portion of operating lease liabilities	21,950	21,482
TOTAL CURRENT LIABILITIES	560,260	506,547
LONG-TERM DEBT, less current portion	171,075	217,119
OPERATING LEASE LIABILITIES, less current portion	92,811	97,839
POSTRETIREMENT LIABILITIES, less current portion	18,514	18,555
OTHER LONG-TERM LIABILITIES	35,722	37,948
DEFERRED INCOME TAXES	64,957	72,407
STOCKHOLDERS' EQUITY
Common stock, $0.01 par value, authorized 70,000,000 shares; issued 2021: 29,317,699 shares, 2020: 29,045,309 shares	293	290
Additional paid-in capital	338,263	342,354
Retained earnings	676,179	595,932
Treasury stock, at cost, 2021: 3,783,227 shares; 2020: 3,656,938 shares	(119,273)	(111,173)
Accumulated other comprehensive income	2,672	1,190
TOTAL STOCKHOLDERS' EQUITY	898,134	828,593
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,841,473	$ 1,779,008

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowances (in dollars)	$ 7,396	$ 7,851
Other accounts receivable, allowances (in dollars)	$ 667	$ 660
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	70,000,000	70,000,000
Common stock, issued shares	29,317,699	29,045,309
Treasury stock, at cost, shares	3,783,227	3,656,938

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUES	$ 948,973	$ 627,370	$ 1,778,186	$ 1,328,769
OPERATING EXPENSES	874,674	606,945	1,671,696	1,300,525
OPERATING INCOME	74,299	20,425	106,490	28,244
OTHER INCOME (COSTS)
Interest and dividend income	322	991	714	2,366
Interest and other related financing costs	(2,274)	(3,378)	(4,702)	(6,325)
Other, net	1,111	2,696	2,303	(1,166)
TOTAL OTHER INCOME (COSTS)	(841)	309	(1,685)	(5,125)
INCOME BEFORE INCOME TAXES	73,458	20,734	104,805	23,119
INCOME TAX PROVISION	12,477	4,854	20,463	5,337
NET INCOME	$ 60,981	$ 15,880	$ 84,342	$ 17,782
EARNINGS PER COMMON SHARE
Basic	$ 2.38	$ 0.62	$ 3.30	$ 0.70
Diluted	$ 2.27	$ 0.61	$ 3.13	$ 0.68
AVERAGE COMMON SHARES OUTSTANDING
Basic	25,586,353	25,463,559	25,522,453	25,468,624
Diluted	26,910,796	26,217,957	26,926,133	26,252,486
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.08	$ 0.08	$ 0.16	$ 0.16

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 60,981	$ 15,880	$ 84,342	$ 17,782
Postretirement benefit plans:
Net actuarial loss, net of tax of: (2021 - Three-month period $-, Six-month period $-; 2020 - Three-month period $-, Six-month period $3)				(8)
Pension settlement expense, net of tax of: (2021 - Three-month period $-, Six-month period $-; 2020 - Three-month period $-, Six-month period $23)				66
Amortization of unrecognized net periodic benefit costs, net of tax of: (2021 - Three-month period $34, Six-month period $69; 2020 - Three-month period $39, Six-month period $76)
Net actuarial gain	(100)	(109)	(200)	(217)
Interest rate swap and foreign currency translation:
Change in unrealized income (loss) on interest rate swap, net of tax of: (2021 - Three-month period $59, Six-month period $263; 2020 - Three-month period $766, Six-month period $414)	166	(174)	741	(1,171)
Change in foreign currency translation, net of tax of: (2021 - Three-month period $215, Six-month period $333; 2020 - Three-month period $842, Six-month period $340)	612	457	941	(963)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	678	174	1,482	(2,293)
TOTAL COMPREHENSIVE INCOME	$ 61,659	$ 16,054	$ 85,824	$ 15,489

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net actuarial loss, tax (benefit)				$ (3)
Pension settlement expense, tax				23
Amortization of unrecognized net periodic benefit costs (credit), tax	$ (34)	$ (39)	$ (69)	(76)
Change in unrealized gain (loss) on interest rate swap, tax (benefit)	59	(766)	263	(414)
Change in foreign currency translation, tax expense (benefit)	$ 215	$ 842	$ 333	$ (340)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common StockCumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Additional Paid-In CapitalCumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-In Capital	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained EarningsCumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Treasury StockCumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Total
Balances at Dec. 31, 2019	$ 288	$ 288	$ 333,943	$ 333,943	$ (198)	$ 532,989	$ 533,187	$ (104,578)	$ (104,578)	$ 203	$ 203	$ (198)	$ 762,845	$ 763,043
Balances (in shares) at Dec. 31, 2019	28,811	28,811						3,405	3,405
Increase (Decrease) in Stockholders' Equity
Net income							1,902							1,902
Other comprehensive income (loss), net of tax											(2,467)			(2,467)
Issuance of common stock under share-based compensation plans (in shares)		6
Tax effect of share-based compensation plans				(60)										(60)
Share-based compensation expense				2,181										2,181
Purchase of treasury stock									$ (3,162)					(3,162)
Purchase of treasury stock (in shares)									150
Dividends declared on common stock							(2,033)							(2,033)
Balances at Mar. 31, 2020		$ 288		336,064			532,858		$ (107,740)		(2,264)			759,206
Balances (in shares) at Mar. 31, 2020		28,817							3,555
Balances at Dec. 31, 2019	$ 288	$ 288	$ 333,943	333,943	$ (198)	$ 532,989	533,187	$ (104,578)	$ (104,578)	$ 203	203	$ (198)	$ 762,845	763,043
Balances (in shares) at Dec. 31, 2019	28,811	28,811						3,405	3,405
Increase (Decrease) in Stockholders' Equity
Net income														17,782
Other comprehensive income (loss), net of tax											(2,293)			(2,293)
Balances at Jun. 30, 2020		$ 290		337,942			546,689		$ (107,740)		(2,090)			775,091
Balances (in shares) at Jun. 30, 2020		28,958							3,555
Balances at Mar. 31, 2020		$ 288		336,064			532,858		$ (107,740)		(2,264)			759,206
Balances (in shares) at Mar. 31, 2020		28,817							3,555
Increase (Decrease) in Stockholders' Equity
Net income							15,880							15,880
Other comprehensive income (loss), net of tax											174			174
Issuance of common stock under share-based compensation plans		$ 2		(2)
Issuance of common stock under share-based compensation plans (in shares)		141
Tax effect of share-based compensation plans				(1,010)										(1,010)
Share-based compensation expense				2,890										2,890
Dividends declared on common stock							(2,049)							(2,049)
Balances at Jun. 30, 2020		$ 290		337,942			546,689		$ (107,740)		(2,090)			775,091
Balances (in shares) at Jun. 30, 2020		28,958							3,555
Balances at Dec. 31, 2020		$ 290		342,354			595,932		$ (111,173)		1,190			828,593
Balances (in shares) at Dec. 31, 2020		29,045							3,657
Increase (Decrease) in Stockholders' Equity
Net income							23,361							23,361
Other comprehensive income (loss), net of tax											804			804
Issuance of common stock under share-based compensation plans		$ 1		(1)
Issuance of common stock under share-based compensation plans (in shares)		12
Tax effect of share-based compensation plans				(165)										(165)
Share-based compensation expense				2,354										2,354
Purchase of treasury stock									$ (1,001)					(1,001)
Purchase of treasury stock (in shares)									15
Dividends declared on common stock							(2,037)							(2,037)
Balances at Mar. 31, 2021		$ 291		344,542			617,256		$ (112,174)		1,994			851,909
Balances (in shares) at Mar. 31, 2021		29,057							3,672
Balances at Dec. 31, 2020		$ 290		342,354			595,932		$ (111,173)		1,190			828,593
Balances (in shares) at Dec. 31, 2020		29,045							3,657
Increase (Decrease) in Stockholders' Equity
Net income														84,342
Other comprehensive income (loss), net of tax											1,482			1,482
Balances at Jun. 30, 2021		$ 293		338,263			676,179		$ (119,273)		2,672			898,134
Balances (in shares) at Jun. 30, 2021		29,318							3,783
Balances at Mar. 31, 2021		$ 291		344,542			617,256		$ (112,174)		1,994			851,909
Balances (in shares) at Mar. 31, 2021		29,057							3,672
Increase (Decrease) in Stockholders' Equity
Net income							60,981							60,981
Other comprehensive income (loss), net of tax											678			678
Issuance of common stock under share-based compensation plans		$ 2		(2)
Issuance of common stock under share-based compensation plans (in shares)		261
Tax effect of share-based compensation plans				(9,601)										(9,601)
Share-based compensation expense				3,324										3,324
Purchase of treasury stock									$ (7,099)					(7,099)
Purchase of treasury stock (in shares)									111
Dividends declared on common stock							(2,058)							(2,058)
Balances at Jun. 30, 2021		$ 293		$ 338,263			$ 676,179		$ (119,273)		$ 2,672			$ 898,134
Balances (in shares) at Jun. 30, 2021		29,318							3,783

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
Net income	$ 84,342	$ 17,782
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	58,709	56,140
Amortization of intangibles	1,927	1,959
Pension settlement expense		89
Share-based compensation expense	5,678	5,071
Provision for losses on accounts receivable	(334)	999
Change in deferred income taxes	(7,612)	(5,170)
Gain on sale of property and equipment and lease termination	(8,408)	(3,581)
Gain on sale of subsidiaries	(6,923)
Changes in operating assets and liabilities:
Receivables	(37,745)	9,626
Prepaid expenses	1,419	1,444
Other assets	25	4,358
Income taxes	12,275	8,413
Operating right-of-use assets and lease liabilities, net	761	(230)
Accounts payable, accrued expenses, and other liabilities	41,786	(14,833)
NET CASH PROVIDED BY OPERATING ACTIVITIES	145,900	82,067
INVESTING ACTIVITIES
Purchases of property, plant and equipment, net of financings	(25,395)	(16,209)
Proceeds from sale of property and equipment	10,864	7,670
Proceeds from sale of subsidiaries	9,013
Purchases of short-term investments	(43,690)	(97,493)
Proceeds from sale of short-term investments	49,165	46,725
Capitalization of internally developed software	(9,477)	(6,495)
NET CASH USED IN INVESTING ACTIVITIES	(9,520)	(65,802)
FINANCING ACTIVITIES
Borrowings under credit facilities		180,000
Borrowings under accounts receivable securitization program		45,000
Payments on long-term debt	(54,643)	(29,185)
Net change in book overdrafts	(922)	615
Deferred financing costs	(189)
Payment of common stock dividends	(4,095)	(4,082)
Purchases of treasury stock	(8,100)	(3,162)
Payments for tax withheld on share-based compensation	(9,766)	(1,070)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(77,715)	188,116
NET INCREASE IN CASH AND CASH EQUIVALENTS	58,665	204,381
Cash and cash equivalents at beginning of period	303,954	201,909
CASH AND CASH EQUIVALENTS CASH AT END OF PERIOD	362,619	406,290
NONCASH INVESTING ACTIVITIES
Equipment and other financings	8,138	13,566
Accruals for equipment received	5,984	857
Lease liabilities arising from obtaining right-of-use assets	$ 6,051	$ 23,727

ORGANIZATION AND DESCRIPTION OF

ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION	6 Months Ended
	Jun. 30, 2021
ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION
ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION	NOTE A – ORGANIZATIO N AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION ​ ArcBest Corporation ™ ​ The Asset-Based segment represented approximately 65% of the Company’s total revenues before other revenues and intercompany eliminations for the six months ended June 30, 2021. As of June 2021, approximately 82% of the Asset-Based segment’s employees were covered under a collective bargaining agreement, the ABF National Master Freight Agreement (the “2018 ABF NMFA”), with the International Brotherhood of Teamsters (the “IBT”), which will remain in effect through June 30, 2023. ​ 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 2020 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. The Company considered the impact of the novel coronavirus (“COVID-19”) pandemic on the estimates and assumptions used in preparation of the Company’s consolidated financial statements as of and for the three and six months ended June 30, 2021. Given the uncertainties regarding the economic environment and the impact of the COVID-19 pandemic on our business, it is possible that these estimates and assumptions may materially change in future periods. ​ Adopted Accounting Pronouncements ​ ASC Topic 740, Income Taxes ​ Accounting Pronouncements Not Yet Adopted ​ Management believes there is no new accounting guidance issued but not yet effective that is relevant to the Company’s current financial statements. ​

FINANCIAL INSTRUMENTS AND FAIR

FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS	6 Months Ended
	Jun. 30, 2021
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS	NOTE B – FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS ​ Financial Instruments ​ The following table presents the components of cash and cash equivalents and short-term investments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 December 31 ​ ​ 2021 ​ 2020 ​ ​ (in thousands) ​ Cash and cash equivalents ​ ​ ​ ​ ​ ​ ​ Cash deposits (1) ​ $ 284,265 ​ $ 240,687 ​ Variable rate demand notes (1)(2) ​ 29,253 ​ 29,066 ​ Money market funds (3) ​ 49,101 ​ 34,201 ​ Total cash and cash equivalents ​ $ 362,619 ​ $ 303,954 ​ ​ ​ ​ ​ ​ ​ ​ ​ Short-term investments ​ ​ ​ ​ ​ ​ ​ Certificates of deposit (1) ​ $ 59,967 ​ $ 53,297 ​ U.S. Treasury securities (4) ​ ​ — ​ ​ 12,111 ​ Total short-term investments ​ $ 59,967 ​ $ 65,408 ​ ​ (1) Recorded at cost plus accrued interest, which approximates fair value. (2) Amounts may be redeemed on a daily basis with the original issuer. (3) Recorded at fair value as determined by quoted market prices (see amounts presented in the table of financial assets and liabilities measured at fair value within this Note). (4) Recorded at amortized cost plus accrued interest, which approximates fair value. U.S. Treasury securities included in short-term investments are held-to-maturity investments with maturity dates of less than one year. ​ The Company’s long-term financial instruments are presented in the table of financial assets and liabilities measured at fair value within this Note. ​ Concentrations of Credit Risk of Financial Instruments The Company is potentially subject to concentrations of credit risk related to its cash, cash equivalents, and short-term investments. The Company reduces credit risk by maintaining its cash deposits primarily in FDIC-insured accounts and placing its short-term investments primarily in FDIC-insured certificates of deposit. However, certain cash deposits and certificates of deposit may exceed federally insured limits. At June 30, 2021 and December 31, 2020, cash, cash equivalents, and short-term investments totaling $132.5 million and $156.4 million, respectively, were neither FDIC insured nor direct obligations of the U.S. government. ​ Fair Value Disclosure of Financial Instruments Fair value disclosures are made in accordance with the following hierarchy of valuation techniques based on whether the inputs of market data and market assumptions used to measure fair value are observable or unobservable: ​ ● Level 1 — Quoted prices for identical assets and liabilities in active markets. ● Level 2 — Quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. ● Level 3 — Unobservable inputs (Company’s market assumptions) that are significant to the valuation model. ​ Fair value and carrying value disclosures of financial instruments are presented in the following table: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 ​ December 31 ​ ​ 2021 2020 ​ ​ (in thousands) ​ ​ ​ ​ Carrying ​ Fair ​ Carrying ​ Fair ​ ​ ​ ​ Value ​ Value ​ Value ​ Value ​ Credit Facility (1) ​ $ 50,000 ​ $ 50,000 ​ $ 70,000 ​ $ 70,000 ​ Notes payable (2) ​ 187,715 ​ 190,519 ​ 214,216 ​ 217,226 ​ New England Pension Fund withdrawal liability (3) ​ ​ 21,092 ​ ​ 23,821 ​ ​ 21,407 ​ ​ 25,523 ​ ​ ​ $ 258,807 ​ $ 264,340 ​ $ 305,623 ​ $ 312,749 ​ ​ (1) The revolving credit facility (the “Credit Facility”) carries a variable interest rate based on LIBOR, plus a margin, that is considered to be priced at market for debt instruments having similar terms and collateral requirements (Level 2 of the fair value hierarchy). (2) Fair value of the notes payable was determined using a present value income approach based on quoted interest rates from lending institutions with which the Company would enter into similar transactions (Level 2 of the fair value hierarchy). (3) ABF Freight’s multiemployer pension plan obligation with the New England Teamsters and Trucking Industry Pension Fund (the “New England Pension Fund”) was restructured under a transition agreement effective on August 1, 2018, which resulted in a related withdrawal liability (see in Note I to the consolidated financial statements in Item 8 of the Company’s 2020 Annual Report on Form 10-K). The fair value of the outstanding withdrawal liability is equal to the present value of the future withdrawal liability payments, discounted at an interest rate of 3.1% and 2.6% at June 30, 2021 and December 31, 2020, respectively, determined using the 20-year U.S. Treasury rate plus a spread (Level 2 of the fair value hierarchy). Included in other long-term liabilities with the current portion included in accrued expenses. ​ Assets and Liabilities Measured at Fair Value on a Recurring Basis ​ The following table presents the assets and liabilities that are measured at fair value on a recurring basis: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2021 ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ ​ ​ Quoted Prices Significant Significant ​ ​ ​ ​ ​ In Active ​ Observable ​ Unobservable ​ ​ ​ ​ ​ ​ Markets ​ Inputs ​ Inputs ​ ​ ​ Total (Level 1) (Level 2) (Level 3) ​ ​ (in thousands) ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Money market funds (1) ​ $ 49,101 ​ $ 49,101 ​ $ — ​ $ — ​ Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan (2) ​ 3,306 ​ 3,306 ​ — ​ — ​ Interest rate swaps (3) ​ ​ 354 ​ ​ — ​ ​ 354 ​ ​ — ​ ​ ​ $ 52,761 ​ $ 52,407 ​ $ 354 ​ $ — ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps (3) ​ $ 973 ​ $ — ​ $ 973 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ ​ ​ Quoted Prices Significant Significant ​ ​ ​ ​ ​ In Active ​ Observable ​ Unobservable ​ ​ ​ ​ ​ ​ Markets ​ Inputs ​ Inputs ​ ​ ​ Total (Level 1) (Level 2) (Level 3) ​ ​ (in thousands) ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Money market funds (1) ​ $ 34,201 ​ $ 34,201 ​ $ — ​ $ — ​ Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan (2) ​ 2,955 ​ 2,955 ​ — ​ — ​ ​ ​ $ 37,156 ​ $ 37,156 ​ $ — ​ $ — ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps (3) ​ $ 1,622 ​ $ — ​ $ 1,622 ​ $ — ​ ​ (1) Included in cash and cash equivalents. (2) Nonqualified deferred compensation plan investments consist of U.S. and international equity mutual funds, government and corporate bond mutual funds, and money market funds which are held in a trust with a third-party brokerage firm. Included in other long-term assets, with a corresponding liability reported within other long-term liabilities. (3) Included in other long-term assets or other long-term liabilities. The fair values of the interest rate swaps were determined by discounting future cash flows and receipts based on expected interest rates observed in market interest rate curves adjusted for estimated credit valuation considerations reflecting nonperformance risk of the Company and the counterparty, which are considered to be in Level 3 of the fair value hierarchy. The Company assessed Level 3 inputs as insignificant to the valuation at June 30, 2021 and December 31, 2020 and considers the interest rate swap valuations in Level 2 of the fair value hierarchy.

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS	6 Months Ended
	Jun. 30, 2021
GOODWILL AND INTANGIBLE ASSETS
GOODWILL AND INTANGIBLE ASSETS	NOTE C – GOODWILL AND INTANGIBLE ASSETS ​ Goodwill represents the excess of cost over the fair value of net identifiable tangible and intangible assets acquired. Goodwill by reportable segment consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ArcBest FleetNet ​ ​ (in thousands) Balances at December 31, 2020 $ 88,320 ​ $ 87,690 ​ $ 630 ​ Goodwill divested (1) ​ (1,952) ​ (1,952) ​ — ​ Balances at June 30, 2021 $ 86,368 $ 85,738 $ 630 (1) Goodwill divested due to the sale of the labor services portion of the ArcBest segment’s moving business was determined based on the relative fair value of the business sold to the total fair value of the reporting unit. ​ Intangible assets consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2021 ​ December 31, 2020 ​ ​ Weighted-Average ​ ​ ​ ​ Accumulated ​ Net ​ ​ ​ ​ Accumulated ​ Net ​ Amortization Period Cost Amortization Value ​ Cost Amortization Value ​ ​ (in years) ​ (in thousands) ​ (in thousands) Finite-lived intangible assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships 14 ​ $ 52,721 ​ $ 32,380 ​ $ 20,341 ​ $ 52,721 ​ $ 30,477 ​ $ 22,244 ​ Other ​ 13 ​ ​ 1,010 ​ ​ 567 ​ ​ 443 ​ ​ 980 ​ ​ 543 ​ ​ 437 ​ ​ 14 ​ 53,731 ​ 32,947 ​ 20,784 ​ ​ 53,701 ​ 31,020 ​ 22,681 ​ Indefinite-lived intangible assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Trade name N/A ​ 32,300 ​ N/A ​ 32,300 ​ ​ 32,300 ​ N/A ​ 32,300 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total intangible assets N/A ​ $ 86,031 ​ $ 32,947 ​ $ 53,084 ​ $ 86,001 ​ $ 31,020 ​ $ 54,981 ​ ​ ​ The future amortization for intangible assets acquired through business acquisitions as of June 30, 2021 was as follows: ​ ​ ​ ​ ​ ​ ​ Amortization of ​ ​ Intangible Assets ​ ​ (in thousands) ​ Remainder of 2021 ​ $ 1,911 ​ 2022 ​ 3,815 ​ 2023 ​ 3,722 ​ 2024 ​ 3,689 ​ 2025 ​ ​ 3,674 ​ Thereafter ​ ​ 3,973 ​ Total amortization ​ $ 20,784 ​ ​

INCOME TAXES

INCOME TAXES	6 Months Ended
	Jun. 30, 2021
INCOME TAXES
INCOME TAXES	NOTE D – INCOME TAXES ​ The effective tax rate was 17.0% and 19.5% for the three and six months ended June 30, 2021, respectively. The effective tax rate was 23.4% and 23.1% for the three and six months ended June 30, 2020, respectively. State tax rates vary among states and average approximately 6.0% to 6.5%, although some state rates are higher and a small number of states do not impose an income tax. ​ For the three and six months ended June 30, 2021, the difference between the Company’s effective tax rate and the federal statutory rate primarily resulted from state income taxes, nondeductible expenses, changes in the cash surrender value of life insurance, federal research and development tax credits, changes in tax valuation allowances, and tax benefit from the vesting of stock awards. For the three and six months ended June 30, 2020, the difference between the Company’s effective tax rate and the federal statutory rate primarily resulted from state income taxes, nondeductible expenses, changes in the cash surrender value of life insurance, federal alternative fuel and research development tax credits, changes in valuation allowances, and the tax expense from the vesting stock awards. The Company’s effective tax rate for the six months ended June 30, 2020 was also impacted by the reversal of an uncertain tax position. ​ As of June 30, 2021, the Company’s deferred tax liabilities, which will reverse in future years, exceeded the deferred tax assets. The Company evaluated the total deferred tax assets at June 30, 2021 and concluded that, other than for certain deferred tax assets related to foreign and state tax credit carryforwards and federal and state net operating losses, the assets did not exceed the amount for which realization is more likely than not. In making this determination, the Company considered the future reversal of existing taxable temporary differences, future taxable income, and tax planning strategies. Valuation allowances for deferred tax assets totaled $1.4 million and $1.3 million at June 30, 2021 and December 31, 2020, respectively. ​ The Company paid federal, state, and foreign income taxes of $15.3 million during the six months ended June 30, 2021, and paid foreign and state income taxes of $2.3 million during the six months ended June 30, 2020. The Company received refunds of federal and state income taxes that were paid in prior years of less than $0.1 million and $0.4 million during the six months ended June 30, 2021 and 2020, respectively.

LEASES

LEASES	6 Months Ended
	Jun. 30, 2021
LEASES
LEASES	NOTE E – 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 components of operating lease expense were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ ​ June 30 ​ June 30 ​ ​ 2021 2020 2021 2020 ​ ​ (in thousands) ​ Operating lease expense ​ $ 6,584 ​ $ 5,803 ​ $ 13,226 ​ $ 11,599 ​ Variable lease expense ​ ​ 963 ​ ​ 543 ​ ​ 2,295 ​ ​ 1,583 ​ Sublease income ​ ​ (156) ​ ​ (42) ​ ​ (311) ​ ​ (134) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total operating lease expense (1) ​ $ 7,391 ​ $ 6,304 ​ $ 15,210 ​ $ 13,048 ​ (1) Operating lease expense excludes short-term leases with a term of 12 months or less. ​ The operating cash flows from operating lease activity were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended ​ ​ ​ June 30, 2021 ​ June 30, 2020 ​ ​ (in thousands) ​ Noncash change in operating right-of-use assets ​ $ 11,386 ​ $ 11,002 ​ Change in operating lease liabilities ​ ​ (10,625) ​ ​ (11,232) ​ Operating right-of-use-assets and lease liabilities, net ​ $ 761 ​ $ (230) ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for amounts included in the measurement of operating lease liabilities ​ $ (12,446) ​ $ (11,826) ​ ​ Maturities of operating lease liabilities at June 30, 2021 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Equipment ​ ​ ​ ​ ​ ​ Land and ​ and ​ ​ Total Structures (1) Other ​ (in thousands) ​ Remainder of 2021 ​ $ 13,071 ​ $ 13,071 ​ $ — ​ 2022 ​ 22,759 ​ 22,723 ​ 36 ​ 2023 ​ 18,281 ​ 18,256 ​ 25 ​ 2024 ​ 16,020 ​ 16,020 ​ — ​ 2025 ​ 13,407 ​ 13,407 ​ — ​ Thereafter ​ 44,136 ​ 44,136 ​ — ​ Total lease payments ​ ​ 127,674 ​ ​ 127,613 ​ ​ 61 ​ Less imputed interest ​ ​ (12,913) ​ ​ (12,912) ​ ​ (1) ​ Total ​ $ 114,761 ​ $ 114,701 ​ $ 60 ​ (1) Excludes future minimum lease payments for a lease which was executed but had not yet commenced as of June 30, 2021 of $37.3 million which will be paid over approximately 10 years . The Company plans to take possession of the leased space in third quarter 2022. ​

LONG-TERM DEBT AND FINANCING AR

LONG-TERM DEBT AND FINANCING ARRANGEMENTS	6 Months Ended
	Jun. 30, 2021
LONG-TERM DEBT AND FINANCING ARRANGEMENTS
LONG-TERM DEBT AND FINANCING ARRANGEMENTS	NOTE F – LONG-TERM DEBT AND FINANCING ARRANGEMENTS ​ Long-Term Debt Obligations ​ Long-term debt consisted of borrowings outstanding under the Company’s revolving credit facility which is further described in Financing Arrangements within this Note, and notes payable and finance lease obligations related to the financing of revenue equipment (tractors and trailers used primarily in Asset-Based segment operations), certain other equipment, and software as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 ​ December 31 ​ ​ 2021 2020 ​ ​ (in thousands) ​ Credit Facility (interest rate of 1.2% (1) ​ $ 50,000 ​ $ 70,000 ​ Notes payable (weighted-average interest rate of 2.9% at June 30, 2021) ​ 187,715 ​ 214,216 ​ Finance lease obligations (weighted-average interest rate of 3.3% at June 30, 2021) ​ 4 ​ 8 ​ ​ ​ 237,719 ​ 284,224 ​ Less current portion ​ 66,644 ​ 67,105 ​ Long-term debt, less current portion ​ $ 171,075 ​ $ 217,119 ​ ​ (1) The interest rate swap mitigates interest rate risk by effectively converting the $50.0 million of borrowings under the Credit Facility from variable-rate interest to fixed-rate interest with a per annum rate of 3.12% based on the margin of the Credit Facility as of both June 30, 2021 and December 31, 2020. ​ ​ Scheduled maturities, including interest payments, of long-term debt obligations as of June 30, 2021 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Credit ​ Notes ​ Finance Lease ​ ​ Total Facility (1) Payable Obligations ​ (in thousands) ​ Due in one year or less $ 71,778 $ 637 $ 71,137 ​ $ 4 ​ Due after one year through two years ​ 57,710 ​ 784 ​ 56,926 ​ — ​ Due after two years through three years ​ 42,571 ​ 1,049 ​ 41,522 ​ — ​ Due after three years through four years ​ 72,345 ​ 50,296 ​ 22,049 ​ — ​ Due after four years through five years ​ 4,567 ​ — ​ 4,567 ​ — ​ Due after five years ​ ​ 124 ​ ​ — ​ ​ 124 ​ ​ — ​ Total payments ​ 249,095 ​ 52,766 ​ 196,325 ​ 4 ​ Less amounts representing interest ​ 11,376 ​ 2,766 ​ 8,610 ​ — ​ Long-term debt $ 237,719 $ 50,000 $ 187,715 ​ $ 4 ​ ​ (1) The future interest payments included in the scheduled maturities due are calculated using variable interest rates based on the LIBOR swap curve, plus the anticipated applicable margin. ​ Assets securing notes payable or held under finance leases were included in property, plant and equipment as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 ​ December 31 ​ ​ 2021 2020 ​ ​ (in thousands) Revenue equipment $ 326,914 $ 326,823 ​ Service, office, and other equipment ​ ​ 26,250 ​ ​ 26,270 ​ Total assets securing notes payable or held under finance leases ​ 353,164 ​ 353,093 ​ Less accumulated depreciation and amortization (1) ​ 135,538 ​ 115,424 ​ Net assets securing notes payable or held under finance leases ​ $ 217,626 ​ $ 237,669 ​ ​ ​ (1) Amortization of assets held under finance leases and depreciation of assets securing notes payable are included in depreciation expense. ​ Financing Arrangements ​ Credit Facility The Company has a revolving credit facility (the “Credit Facility”) under its Third Amended and Restated Credit Agreement (the “Credit Agreement”) with an initial maximum credit amount of $250.0 million, including a swing line facility in an aggregate amount of up to $25.0 million and a letter of credit sub-facility providing for the issuance of letters of credit up to an aggregate amount of $20.0 million. The Company may request additional revolving commitments or incremental term loans thereunder up to an aggregate amount of $125.0 million, subject to certain additional conditions as provided in the Credit Agreement. In June 2021, the Company repaid $20.0 million of borrowings under the Credit Facility. As of June 30, 2021, standby letters of credit of $0.6 million have been issued under the Credit Facility, which reduced the available borrowing capacity to $199.4 million under the initial maximum credit amount of the Credit Facility, as of June 30, 2021. ​ Principal payments under the Credit Facility are due upon maturity of the facility on October 1, 2024; however, borrowings may be repaid, at the Company’s discretion, in whole or in part at any time, without penalty, subject to required notice periods and compliance with minimum prepayment amounts. The Credit Agreement contains conditions, representations and warranties, events of default, and indemnification provisions that are customary for financings of this type, including, but not limited to, a minimum interest coverage ratio, a maximum adjusted leverage ratio, and limitations on incurrence of debt, investments, liens on assets, certain sale and leaseback transactions, transactions with affiliates, mergers, consolidations, purchases and sales of assets, and certain restricted payments. The Company was in compliance with the covenants under the Credit Agreement at June 30, 2021. ​ Interest Rate Swaps The Company has an interest rate swap agreement with a $50.0 million notional amount which started on January 2, 2020 and will mature on June 30, 2022. The Company receives floating-rate interest amounts based on one-month LIBOR in exchange for fixed-rate interest payments of 1.99% over the life of the agreement. The interest rate swap mitigates interest rate risk by effectively converting $50.0 million of borrowings under the Credit Facility from variable-rate interest to fixed-rate interest with a per annum rate of 3.12% based on the margin of the Credit Facility as of June 30, 2021. The fair value of the interest rate swap of $1.0 million and $1.4 million was recorded in other long-term liabilities in the consolidated balance sheet at June 30, 2021 and December 31, 2020, respectively. ​ The Company also has an interest rate swap agreement with a $50.0 million notional amount which will start on June 30, 2022 and mature on October 1, 2024. The Company will receive floating-rate interest amounts based on one-month LIBOR in exchange for fixed-rate interest payments of 0.43% beginning on June 30, 2022 throughout the remaining term of the agreement. From June 30, 2022 to October 1, 2024, the extended interest rate swap agreement will effectively convert the $50.0 million of borrowings under the Credit Facility from variable-rate interest to fixed-rate interest with a per annum rate of 1.56% based on the margin of the Credit Facility as of June 30, 2021. The fair value of the interest rate swap of $0.4 million was recorded in other long-term assets and $0.2 million was recorded in other long-term liabilities in the consolidated balance sheet at June 30, 2021 and December 31, 2020, respectively. ​ The unrealized gain or loss on the interest rate swap instruments was reported as a component of accumulated other comprehensive income, net of tax, in stockholders’ equity at June 30, 2021 and December 31, 2020, and the change in the unrealized loss on the interest rate swaps for the three and six months ended June 30, 2021 and 2020 was reported in other comprehensive income (loss), net of tax, in the consolidated statements of comprehensive income. The interest rate swaps are subject to certain customary provisions that could allow the counterparty to request immediate settlement of the fair value liability or asset upon violation of any or all of the provisions. The Company was in compliance with all provisions of the interest rate swap agreements at June 30, 2021. ​ Accounts Receivable Securitization Program In June 2021, the Company amended and restated its accounts receivable securitization program. The amendment extended the maturity date of this program from October 1, 2021 to July 1, 2024, decreased the amount of available cash proceeds under the facility from $125.0 million to $50.0 million and increased the amount of additional borrowings the Company may request under the accordion feature from $25.0 million to $100.0 million, subject to certain conditions. ​ Under this program, certain subsidiaries of the Company continuously sell a designated pool of trade accounts receivables to a wholly owned subsidiary which, in turn, may borrow funds on a revolving basis. This wholly owned consolidated subsidiary is a separate bankruptcy-remote entity, and its assets would be available only to satisfy the claims related to the lender’s interest in the trade accounts receivables. Borrowings under the accounts receivable securitization program bear interest based upon LIBOR, plus a margin, and an annual facility fee. The securitization agreement contains representations and warranties, affirmative and negative covenants, and events of default that are customary for financings of this type, including a maximum adjusted leverage ratio covenant. The Company was in compliance with the covenants under the accounts receivable securitization program at June 30, 2021. ​ The accounts receivable securitization program includes a provision under which the Company may request and the letter of credit issuer may issue standby letters of credit, primarily in support of workers’ compensation and third-party casualty claims liabilities in various states in which the Company is self-insured. The outstanding standby letters of credit reduce the availability of borrowings under the program. As of June 30, 2021, standby letters of credit of $10.1 million have been issued under the program, which reduced the available borrowing capacity to $39.9 million. ​ Letter of Credit Agreements and Surety Bond Programs As of June 30, 2021, the Company had letters of credit outstanding of $11.2 million (including $10.1 million issued under the accounts receivable securitization program and $0.6 million issued under the Credit Facility). The Company has programs in place with multiple surety companies for the issuance of surety bonds in support of its self-insurance program. As of June 30, 2021, surety bonds outstanding related to the self-insurance program totaled $61.6 million. ​ Notes Payable The Company has financed the purchase of certain revenue equipment, other equipment, and software through promissory note arrangements, including $8.1 million for revenue equipment during the three months ended June 30, 2021. ​ Subsequent to June 30, 2021, the Company financed the purchase of an additional $12.9 million of revenue equipment through promissory note arrangements as of August 2, 2021.

POSTRETIREMENT BENEFIT PLANS

POSTRETIREMENT BENEFIT PLANS	6 Months Ended
	Jun. 30, 2021
POSTRETIREMENT BENEFIT PLANS
POSTRETIREMENT BENEFIT PLANS	NOTE G – POSTRETIREMENT BENEFIT PLANS ​ Supplemental Benefit and Postretirement Health Benefit Plans ​ The following is a summary of the components of net periodic benefit cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30 ​ ​ ​ Supplemental ​ Postretirement ​ ​ ​ Benefit Plan ​ Health Benefit Plan ​ ​ 2021 2020 2021 2020 ​ ​ (in thousands) ​ Service cost ​ $ — ​ $ — ​ $ 48 ​ $ 47 ​ Interest cost ​ 1 ​ 2 ​ 107 ​ 144 ​ Amortization of net actuarial (gain) loss (1) ​ 3 ​ 1 ​ (137) ​ (149) ​ Net periodic benefit cost (2) ​ $ 4 ​ $ 3 ​ $ 18 ​ $ 42 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30 ​ ​ ​ Supplemental ​ Postretirement ​ ​ ​ Benefit Plan ​ Health Benefit Plan ​ ​ 2021 2020 2021 (2) 2020 ​ ​ (in thousands) ​ Service cost ​ $ — ​ $ — ​ $ 96 ​ $ 94 ​ Interest cost ​ 2 ​ 5 ​ 214 ​ 288 ​ Amortization of prior service credit ​ — ​ — ​ — ​ — ​ Pension settlement expense (3) ​ — ​ 89 ​ — ​ — ​ Amortization of net actuarial (gain) loss (1) ​ 5 ​ 5 ​ (274) ​ (298) ​ Net periodic benefit cost (2) ​ $ 7 ​ $ 99 ​ $ 36 ​ $ 84 ​ ​ (1) The Company amortizes actuarial gains and losses over the average remaining active service period of the plan participants and does not use a corridor approach. (2) Service cost is reported within operating expenses and the other components of net periodic benefit cost (including pension settlement expense) are reported within the other line item of other income (costs) in the consolidated statements of operations. (3) For the six months ended June 30, 2020, pension settlement expense for the supplemental benefit plan of $0.1 million (pre-tax), or $0.1 million (after-tax), was due to a $0.7 million benefit related to an officer retirement. ​ ​ Multiemployer Plans ​ ABF Freight System, Inc. and certain other subsidiaries reported in the Company’s Asset-Based operating segment (“ABF Freight”) contribute to multiemployer pension and health and welfare plans, which have been established pursuant to the Taft-Hartley Act, to provide benefits for its contractual employees. The 25 multiemployer pension plans to which ABF Freight contributes vary greatly in size and in funded status. Contributions to these plans are based generally on the time worked by ABF Freight’s contractual employees at rates specified in the 2018 ABF NMFA and other related supplemental agreements. ABF Freight recognizes as expense the contractually required contributions for each period and recognizes as a liability any contributions due and unpaid. The funding obligations to the multiemployer pension plans are intended to satisfy the requirements imposed by the Pension Protection Act of 2006, which was permanently extended by the Multiemployer Pension Reform Act (the “Reform Act”) included in the Consolidated and Further Continuing Appropriations Act of 2015. ​ Approximately one half of ABF Freight’s total contributions to multiemployer pension plans are made to the Central States, Southeast and Southwest Areas Pension Plan (the “Central States Pension Plan”). As set forth in the 2020 Annual Funding Notice for the Central States Pension Plan, the funded percentage of the plan was 19.5% as of January 1, 2020. In the Notice of Critical and Declining Status for the Central States Pension Plan dated March 31, 2021, the plan’s actuary certified that the plan is in critical and declining status, as defined by the Reform Act, for the plan year beginning January 1, 2021. Critical and declining status is applicable to critical status plans that are projected to become insolvent anytime within the next 14 plan years, or if the plan is projected to become insolvent within the next 19 plan years and either the plan’s ratio of inactive participants to active participants exceeds two to one or the plan’s funded percentage is less than 80% . ​ On March 11, 2021, H.R.1319, the American Rescue Plan Act of 2021 Butch Lewis Emergency Pension Plan Relief Act of 2021 ​ On July 9, 2021, the PBGC announced an interim final rule implementing a Special Financial Assistance Program ​ The multiemployer plan administrators have provided to the Company no other significant changes in information related to multiemployer plans from the information disclosed in the Company’s 2020 Annual Report on Form 10-K.

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	6 Months Ended
	Jun. 30, 2021
STOCKHOLDERS' EQUITY
STOCKHOLDERS' EQUITY	NOTE H – STOCKHOLDERS’ EQUITY ​ Accumulated Other Comprehensive Income ​ Components of accumulated other comprehensive income were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 December 31 ​ ​ 2021 2020 ​ ​ (in thousands) ​ Pre-tax amounts: ​ ​ ​ ​ ​ ​ ​ Unrecognized net periodic benefit credit ​ $ 4,121 ​ $ 4,390 ​ Interest rate swap ​ ​ (618) ​ ​ (1,622) ​ Foreign currency translation ​ 92 ​ (1,182) ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 3,595 ​ $ 1,586 ​ ​ ​ ​ ​ ​ ​ ​ ​ After-tax amounts: ​ ​ ​ ​ ​ ​ ​ Unrecognized net periodic benefit credit ​ $ 3,060 ​ $ 3,260 ​ Interest rate swap ​ ​ (457) ​ ​ (1,198) ​ Foreign currency translation ​ 69 ​ (872) ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 2,672 ​ $ 1,190 ​ ​ ​ ​ The following is a summary of the changes in accumulated other comprehensive income (loss), net of tax, by component for the three months ended June 30, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unrecognized ​ ​ Interest Foreign ​ ​ ​ ​ ​ ​ Net Periodic ​ ​ Rate ​ Currency ​ ​ Total Benefit Costs ​ Swap Translation ​ ​ (in thousands) ​ Balances at December 31, 2020 ​ $ 1,190 ​ $ 3,260 ​ $ (1,198) ​ $ (872) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income before reclassifications ​ 1,682 ​ — ​ ​ 741 ​ 941 ​ Amounts reclassified from accumulated other comprehensive loss ​ (200) ​ (200) ​ ​ — ​ — ​ Net current-period other comprehensive income (loss) ​ 1,482 ​ (200) ​ ​ 741 ​ 941 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at June 30, 2021 ​ $ 2,672 ​ $ 3,060 ​ $ (457) ​ $ 69 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at December 31, 2019 ​ ​ 203 ​ ​ 2,152 ​ ​ (416) ​ ​ (1,533) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive loss before reclassifications ​ ​ (2,142) ​ ​ (8) ​ ​ (1,171) ​ ​ (963) ​ Amounts reclassified from accumulated other comprehensive income ​ ​ (151) ​ ​ (151) ​ ​ — ​ ​ — ​ Net current-period other comprehensive loss ​ ​ (2,293) ​ ​ (159) ​ ​ (1,171) ​ ​ (963) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at June 30, 2020 ​ $ (2,090) ​ $ 1,993 ​ $ (1,587) ​ $ (2,496) ​ ​ The following is a summary of the significant reclassifications out of accumulated other comprehensive income by component: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unrecognized Net Periodic ​ ​ ​ Benefit Credit (1)(2) ​ ​ Six Months Ended June 30 ​ ​ 2021 2020 ​ ​ (in thousands) Amortization of net actuarial gain ​ $ 269 ​ $ 293 ​ Pension settlement expense (3) ​ ​ — ​ (89) ​ Total, pre-tax ​ ​ 269 ​ 204 ​ Tax expense ​ ​ (69) ​ (53) ​ Total, net of tax ​ $ 200 ​ $ 151 ​ ​ (1) Amounts in parentheses indicate increases in expense or loss. (2) These components of accumulated other comprehensive income are included in the computation of net periodic benefit cost as disclosed in Note G. (3) For the six months ended June 30, 2020, pension settlement expense is related to the supplemental benefit plan (see Note G). ​ Dividends on Common Stock ​ The following table is a summary of dividends declared during the applicable quarter: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ Per Share Amount Per Share Amount ​ ​ (in thousands, except per share data) First quarter ​ $ 0.08 ​ $ 2,037 ​ $ 0.08 ​ $ 2,033 ​ Second quarter ​ $ 0.08 ​ $ 2,058 ​ $ 0.08 ​ $ 2,049 ​ ​ On July 27, 2021, the Company’s Board of Directors declared a dividend of $0.08 per share to stockholders of record as of August 11, 2021. ​ Treasury Stock ​ The Company has a program to repurchase its common stock in the open market or in privately negotiated transactions. The program has no expiration date but may be terminated at any time at the Board of Directors’ discretion. Repurchases may be made using the Company’s cash reserves or other available sources. As of December 31, 2020, the Company had $6.6 million remaining under the program for repurchases of its common stock. On January 28, 2021 the Board of Directors extended the share repurchase program by authorizing a total of $50.0 million to be available for purchases of the Company’s common stock. During the six months ended June 30, 2021, the Company purchased 126,289 shares for an aggregate cost of $8.1 million, leaving $41.9 million available for repurchase of common stock under the program.

EARNINGS PER SHARE

EARNINGS PER SHARE	6 Months Ended
	Jun. 30, 2021
EARNINGS PER SHARE
EARNINGS PER SHARE	NOTE I – EARNINGS PER SHARE ​ The following table sets forth the computation of basic and diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ ​ June 30 ​ June 30 ​ ​ 2021 2020 2021 2020 ​ ​ (in thousands, except share and per share data) ​ Basic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 60,981 ​ $ 15,880 ​ $ 84,342 ​ $ 17,782 ​ Effect of unvested restricted stock awards ​ — ​ (17) ​ — ​ (18) ​ Adjusted net income ​ $ 60,981 ​ $ 15,863 ​ $ 84,342 ​ $ 17,764 ​ Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares ​ 25,586,353 ​ 25,463,559 ​ 25,522,453 ​ 25,468,624 ​ Earnings per common share ​ $ 2.38 ​ $ 0.62 ​ $ 3.30 ​ $ 0.70 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 60,981 ​ $ 15,880 ​ $ 84,342 ​ $ 17,782 ​ Effect of unvested restricted stock awards ​ — ​ (17) ​ — ​ (18) ​ Adjusted net income ​ $ 60,981 ​ $ 15,863 ​ $ 84,342 ​ $ 17,764 ​ Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares ​ 25,586,353 ​ 25,463,559 ​ 25,522,453 ​ 25,468,624 ​ Effect of dilutive securities ​ 1,324,443 ​ 754,398 ​ 1,403,680 ​ 783,862 ​ Adjusted weighted-average shares and assumed conversions ​ 26,910,796 ​ 26,217,957 ​ 26,926,133 ​ 26,252,486 ​ Earnings per common share ​ $ 2.27 ​ $ 0.61 ​ $ 3.13 ​ $ 0.68 ​ ​

OPERATING SEGMENT DATA

OPERATING SEGMENT DATA	6 Months Ended
	Jun. 30, 2021
OPERATING SEGMENT DATA
OPERATING SEGMENT DATA	NOTE J – OPERATING SEGMENT DATA ​ The Company uses the “management approach” to determine its reportable operating segments, as well as to determine the basis of reporting the operating segment information. The management approach focuses on financial information that the Company’s management uses to make operating decisions. Management uses revenues, operating expense categories, operating ratios, operating income, and key operating statistics to evaluate performance and allocate resources to the Company’s operations. ​ The Company’s reportable operating segments are impacted by seasonal fluctuations which affect tonnage, shipment or service event levels, and demand for services, as described below; therefore, operating results for the interim periods presented may not necessarily be indicative of the results for the fiscal year. The COVID-19 pandemic had a significant negative impact on demand for the Company’s services during the three months ended June 30, 2020, resulting in lower tonnage, shipment, and service event levels and, consequently, lower segment revenues for the second quarter of 2020. As a result, the Company’s operating segment information for the three months ended June 30, 2020 does not reflect typical seasonal trends in business levels as described below for the Company’s reportable operating segments. ​ The Company’s reportable operating segments are as follows: ​ ● The Asset-Based segment includes the results of operations of ABF Freight System, Inc. and certain other subsidiaries. The segment operations include national, inter-regional, and regional transportation of general commodities through standard, expedited, and guaranteed LTL services. The Asset-Based segment provides services to the ArcBest segment, including freight transportation related to certain consumer household goods self-move services. ​ Freight shipments and operating costs of the Asset-Based segment can be adversely affected by inclement weather conditions. The second and third calendar quarters of each year usually have the highest tonnage levels while the first quarter generally has the lowest, although other factors, including the state of the U.S. and global economies, available capacity in the market, and the impact of other adverse external events or conditions, including the COVID-19 pandemic, may influence quarterly freight tonnage levels. ​ ● The ArcBest segment includes the results of operations of the Company’s service offerings in ground expedite, truckload, dedicated, intermodal, household goods moving, managed transportation, warehousing and distribution, and international freight transportation for air, ocean, and ground. The ArcBest segment provides services to the Asset-Based segment. ​ ArcBest segment operations are influenced by seasonal fluctuations that impact customers’ supply chains. The second and third calendar quarters of each year usually have the highest shipment levels while the first quarter generally has the lowest, although other factors, including the state of the U.S. and global economies, available capacity in the market, and the impact of other adverse external events or conditions, including the COVID-19 pandemic, may impact quarterly business levels. Shipments of the ArcBest segment may decline during winter months because of post-holiday slowdowns, but expedite shipments can be subject to short-term increases depending on the impact of weather disruptions to customers’ supply chains. Plant shutdowns during summer months may affect shipments for automotive and manufacturing customers of the ArcBest segment, but severe weather events can result in higher demand for expedite services. Moving services of the ArcBest segment are impacted by seasonal fluctuations, generally resulting in higher business levels in the second and third quarters as the demand for moving services is typically stronger in the summer months. ​ ● FleetNet includes the results of operations of FleetNet America, Inc. and certain other subsidiaries that provide roadside assistance and maintenance management services for commercial vehicles through a network of third-party service providers. FleetNet provides services to the Asset-Based and ArcBest segments. ​ Emergency roadside service events of the FleetNet segment are favorably impacted by extreme weather conditions that affect commercial vehicle operations, and the segment’s results of operations will be influenced by seasonal variations in service event volume and the impact of other external events or conditions, including the COVID-19 pandemic. ​ The Company’s other business activities and operating segments that are not reportable include ArcBest Corporation and certain other subsidiaries. Certain costs incurred by the parent holding company and the Company’s shared services subsidiary are allocated to the reporting segments. The Company eliminates intercompany transactions in consolidation. However, the information used by the Company’s management with respect to its reportable segments is before intersegment eliminations of revenues and expenses. ​ Shared services represent costs incurred to support all segments, including sales, pricing, customer service, marketing, capacity sourcing functions, human resources, financial services, information technology, and other company-wide services. Certain overhead costs are not attributable to any segment and remain unallocated in “Other and eliminations.” Included in unallocated costs are expenses related to investor relations, legal, the ArcBest Board of Directors, and certain technology investments. Shared services costs attributable to the operating segments are predominantly allocated based upon estimated and planned resource utilization-related metrics such as estimated shipment levels, number of pricing proposals, or number of personnel supported. The bases for such charges are modified and adjusted by management when necessary or appropriate to reflect fairly and equitably the actual incidence of cost incurred by the operating segments. Management believes the methods used to allocate expenses are reasonable. ​ Further classifications of operations or revenues by geographic location are impracticable and, therefore, are not provided. The Company’s foreign operations are not significant. ​ The following tables reflect reportable operating segment information: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ June 30 ​ June 30 ​ 2021 2020 2021 2020 ​ ​ (in thousands) REVENUES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 652,832 ​ $ 460,070 $ 1,209,124 $ 975,783 ​ ArcBest ​ 270,748 ​ 151,467 ​ 523,084 ​ 316,242 ​ FleetNet ​ 59,547 ​ 46,440 ​ 118,710 ​ 98,879 ​ Other and eliminations ​ (34,154) ​ (30,607) ​ (72,732) ​ (62,135) ​ Total consolidated revenues $ 948,973 $ 627,370 $ 1,778,186 $ 1,328,769 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPERATING EXPENSES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Salaries, wages, and benefits ​ $ 302,370 ​ $ 248,995 $ 588,064 $ 532,833 ​ Fuel, supplies, and expenses ​ 64,689 ​ 45,675 ​ 125,530 ​ 106,900 ​ Operating taxes and licenses ​ 12,303 ​ 11,629 ​ 24,551 ​ 24,423 ​ Insurance ​ 9,454 ​ 8,247 ​ 18,393 ​ 16,071 ​ Communications and utilities ​ 4,663 ​ 4,342 ​ 9,633 ​ 9,053 ​ Depreciation and amortization ​ 23,308 ​ 23,327 ​ 46,792 ​ 46,597 ​ Rents and purchased transportation ​ 95,082 ​ 46,152 ​ 170,670 ​ 101,922 ​ Shared services ​ ​ 69,372 ​ ​ 45,605 ​ ​ 125,238 ​ ​ 94,490 ​ Gain on sale of property and equipment (1) ​ 71 ​ (1,175) ​ (8,624) ​ (3,339) ​ Innovative technology costs (2) ​ 7,532 ​ 4,789 ​ 14,400 ​ 9,322 ​ Other ​ 77 ​ 1,448 ​ 511 ​ 3,235 ​ Total Asset-Based ​ 588,921 ​ 439,034 ​ ​ 1,115,158 ​ ​ 941,507 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ArcBest ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchased transportation ​ 226,603 ​ 125,090 ​ 437,598 ​ 262,272 ​ Supplies and expenses ​ 2,476 ​ 1,989 ​ 5,044 ​ 4,269 ​ Depreciation and amortization ​ 2,366 ​ 2,449 ​ 4,752 ​ 4,919 ​ Shared services ​ ​ 29,078 ​ ​ 18,840 ​ ​ 55,150 ​ ​ 40,567 ​ Gain on sale of subsidiaries (3) ​ ​ (6,923) ​ ​ — ​ ​ (6,923) ​ ​ — ​ Other ​ ​ 2,021 ​ 1,796 ​ ​ 4,071 ​ ​ 4,321 ​ Total ArcBest ​ 255,621 ​ 150,164 ​ 499,692 ​ 316,348 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ FleetNet ​ 58,409 ​ 45,658 ​ 116,549 ​ 97,057 ​ Other and eliminations ​ (28,277) ​ (27,911) (59,703) ​ (54,387) ​ Total consolidated operating expenses ​ $ 874,674 ​ $ 606,945 ​ $ 1,671,696 ​ $ 1,300,525 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPERATING INCOME ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 63,911 ​ $ 21,036 ​ $ 93,966 ​ $ 34,276 ​ ArcBest ​ 15,127 ​ 1,303 ​ 23,392 ​ (106) ​ FleetNet ​ 1,138 ​ 782 ​ 2,161 ​ 1,822 ​ Other and eliminations ​ (5,877) ​ (2,696) ​ $ (13,029) ​ $ (7,748) ​ Total consolidated operating income ​ $ 74,299 ​ $ 20,425 ​ ​ 106,490 ​ ​ 28,244 ​ OTHER INCOME (COSTS) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest and dividend income ​ $ 322 ​ $ 991 ​ $ 714 ​ $ 2,366 ​ Interest and other related financing costs ​ (2,274) ​ (3,378) ​ (4,702) ​ (6,325) ​ Other, net (4) ​ 1,111 ​ 2,696 ​ 2,303 ​ (1,166) ​ Total other income (costs) ​ (841) ​ 309 ​ (1,685) ​ (5,125) ​ INCOME BEFORE INCOME TAXES ​ $ 73,458 ​ $ 20,734 ​ $ 104,805 ​ $ 23,119 ​ ​ ​ (1) The six months ended June 30, 2021 includes an $8.6 million gain on the sale of an unutilized service center property. (2) Represents costs associated with the freight handling pilot test program at ABF Freight. (3) Gain recognized for the three and six months ended June 30, 2021 relates to the sale of the labor services portion of the ArcBest segment’s moving business in May 2021. (4) Includes the components of net periodic benefit cost other than service cost related to the Company’s SBP and postretirement plans (see Note G) and proceeds and changes in cash surrender value of life insurance policies. ​ ​ The following table reflects information about revenues from customers and intersegment revenues: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ June 30 ​ June 30 ​ 2021 2020 2021 2020 ​ ​ (in thousands) Revenues from customers ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 630,145 ​ $ 439,585 $ 1,159,869 $ 935,313 ​ ArcBest ​ 268,038 ​ 149,683 ​ 518,279 ​ 312,631 ​ FleetNet ​ 49,951 ​ 37,245 ​ 98,385 ​ 78,989 ​ Other ​ 839 ​ 857 ​ 1,653 ​ 1,836 ​ Total consolidated revenues $ 948,973 $ 627,370 $ 1,778,186 $ 1,328,769 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Intersegment revenues ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 22,687 ​ $ 20,485 ​ $ 49,255 ​ $ 40,470 ​ ArcBest ​ ​ 2,710 ​ ​ 1,784 ​ ​ 4,805 ​ ​ 3,611 ​ FleetNet ​ ​ 9,596 ​ ​ 9,195 ​ ​ 20,325 ​ ​ 19,890 ​ Other and eliminations ​ ​ (34,993) ​ ​ (31,464) ​ ​ (74,385) ​ ​ (63,971) ​ Total intersegment revenues ​ $ — $ — $ — $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total segment revenues ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 652,832 ​ $ 460,070 ​ $ 1,209,124 ​ $ 975,783 ​ ArcBest ​ ​ 270,748 ​ ​ 151,467 ​ ​ 523,084 ​ ​ 316,242 ​ FleetNet ​ ​ 59,547 ​ ​ 46,440 ​ ​ 118,710 ​ ​ 98,879 ​ Other and eliminations ​ ​ (34,154) ​ ​ (30,607) ​ ​ (72,732) ​ ​ (62,135) ​ Total consolidated revenues ​ $ 948,973 ​ $ 627,370 ​ $ 1,778,186 ​ $ 1,328,769 ​ ​ The following table presents operating expenses by category on a consolidated basis: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ June 30 ​ June 30 ​ ​ 2021 2020 2021 2020 ​ (in thousands) ​ OPERATING EXPENSES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Salaries, wages, and benefits ​ $ 389,146 ​ $ 305,220 ​ $ 748,541 ​ $ 650,166 ​ Rents, purchased transportation, and other costs of services ​ 347,760 ​ 187,914 ​ 657,098 ​ 404,942 ​ Fuel, supplies, and expenses ​ 80,020 ​ 54,838 ​ 153,169 ​ 126,611 ​ Depreciation and amortization (1) ​ 30,282 ​ 29,086 ​ 60,636 ​ 58,099 ​ Other (2) ​ 27,466 ​ 29,887 ​ 52,252 ​ 60,707 ​ ​ ​ $ 874,674 ​ $ 606,945 ​ $ 1,671,696 ​ $ 1,300,525 ​ (1) Includes amortization of intangible assets. (2) The three and six months ended June 30, 2021 includes a $6.9 million gain related to the sale of a subsidiary within the ArcBest segment. The six months ended June 30, 2021 also includes an $8.6 million gain related to the sale of an unutilized service center property within the Asset-Based segment. ​

LEGAL PROCEEDINGS, ENVIRONMENTA

LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS	6 Months Ended
	Jun. 30, 2021
LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS
LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS	NOTE K – LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS ​ The Company is involved in various legal actions arising in the ordinary course of business. The Company maintains liability insurance against certain risks arising out of the normal course of its business, subject to certain self-insured retention limits. The Company routinely establishes and reviews the adequacy of reserves for estimated legal, environmental, and self-insurance exposures. While management believes that amounts accrued in the consolidated financial statements are adequate, estimates of these liabilities may change as circumstances develop. Considering amounts recorded, routine legal matters are not expected to have a material adverse effect on the Company’s financial condition, results of operations, or cash flows. ​ Environmental Matters ​ The Company’s subsidiaries store fuel for use in tractors and trucks in underground tanks at certain facilities. Maintenance of such tanks is regulated at the federal and, in most cases, state levels. The Company believes it is in substantial compliance with all such regulations. The Company’s underground storage tanks are required to have leak detection systems. The Company is not aware of any leaks from such tanks that could reasonably be expected to have a material adverse effect on the Company. ​ The Company has received notices from the Environmental Protection Agency (the “EPA”) and others that it has been identified as a potentially responsible party under the Comprehensive Environmental Response Compensation and Liability Act, or other federal or state environmental statutes, at several hazardous waste sites. After investigating the Company’s involvement in waste disposal or waste generation at such sites, the Company has either agreed to de minimis settlements or determined that its obligations, other than those specifically accrued with respect to such sites, would involve immaterial monetary liability, although there can be no assurances in this regard. The Company maintains an accrual which is included in accrued expenses in the consolidated balance sheets, for estimated environmental cleanup costs of properties currently or previously operated by the Company. Amounts accrued reflect management’s best estimate of the future undiscounted exposure related to identified properties based on current environmental regulations, management’s experience with similar environmental matters, and testing performed at certain sites. ​ Certain Asset-Based service center facilities operate with no exposure certifications or stormwater permits under the federal Clean Water Act (“the CWA”). The no exposure certification and stormwater permits may require periodic facility inspections and monitoring and reporting of stormwater sampling results. The Company determined that certain procedures regarding sampling, documentation, and reporting were not appropriately being performed in accordance with the CWA. As such, the Company self-reported the matter to the EPA. An estimated settlement expense for this matter is accrued within accrued expenses in the consolidated balance sheet as of June 30, 2021. Resolution of this matter is not expected to have a material adverse effect on the Company’s financial condition, results of operations, or cash flows. ​ Other Events ​ In February 2021, the Company received a Notice of Assessment from a state pertaining to uncollected sales and use tax, including interest and penalties, for the period September 1, 2016 to November 30, 2018. The Company does not agree with the basis of the assessment and filed an appeal in May 2021. The Company has previously accrued an amount related to this assessment consistent with applicable accounting guidance, but if the state prevails in its position, the Company may owe additional tax. Management does not believe the amount involved will have a material adverse effect on the Company’s financial condition, results of operations, or cash flows. ​ ​

ORGANIZATION AND DESCRIPTION _2

ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Policies)	6 Months Ended
	Jun. 30, 2021
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 2020 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. The Company considered the impact of the novel coronavirus (“COVID-19”) pandemic on the estimates and assumptions used in preparation of the Company’s consolidated financial statements as of and for the three and six months ended June 30, 2021. Given the uncertainties regarding the economic environment and the impact of the COVID-19 pandemic on our business, it is possible that these estimates and assumptions may materially change in future periods.
Adopted Accounting Pronouncements and Accounting Pronouncements Not Yet Adopted	Adopted Accounting Pronouncements ​ ASC Topic 740, Income Taxes ​ Accounting Pronouncements Not Yet Adopted ​ Management believes there is no new accounting guidance issued but not yet effective that is relevant to the Company’s current financial statements.

FINANCIAL INSTRUMENTS AND FAI_2

FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables)	6 Months Ended
	Jun. 30, 2021
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS
Schedule components of cash and cash equivalents, short term investments, and restricted funds	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 December 31 ​ ​ 2021 ​ 2020 ​ ​ (in thousands) ​ Cash and cash equivalents ​ ​ ​ ​ ​ ​ ​ Cash deposits (1) ​ $ 284,265 ​ $ 240,687 ​ Variable rate demand notes (1)(2) ​ 29,253 ​ 29,066 ​ Money market funds (3) ​ 49,101 ​ 34,201 ​ Total cash and cash equivalents ​ $ 362,619 ​ $ 303,954 ​ ​ ​ ​ ​ ​ ​ ​ ​ Short-term investments ​ ​ ​ ​ ​ ​ ​ Certificates of deposit (1) ​ $ 59,967 ​ $ 53,297 ​ U.S. Treasury securities (4) ​ ​ — ​ ​ 12,111 ​ Total short-term investments ​ $ 59,967 ​ $ 65,408 ​ ​ (1) Recorded at cost plus accrued interest, which approximates fair value. (2) Amounts may be redeemed on a daily basis with the original issuer. (3) Recorded at fair value as determined by quoted market prices (see amounts presented in the table of financial assets and liabilities measured at fair value within this Note). (4) Recorded at amortized cost plus accrued interest, which approximates fair value. U.S. Treasury securities included in short-term investments are held-to-maturity investments with maturity dates of less than one year.
Schedule of fair value and carrying value disclosures of financial instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 ​ December 31 ​ ​ 2021 2020 ​ ​ (in thousands) ​ ​ ​ ​ Carrying ​ Fair ​ Carrying ​ Fair ​ ​ ​ ​ Value ​ Value ​ Value ​ Value ​ Credit Facility (1) ​ $ 50,000 ​ $ 50,000 ​ $ 70,000 ​ $ 70,000 ​ Notes payable (2) ​ 187,715 ​ 190,519 ​ 214,216 ​ 217,226 ​ New England Pension Fund withdrawal liability (3) ​ ​ 21,092 ​ ​ 23,821 ​ ​ 21,407 ​ ​ 25,523 ​ ​ ​ $ 258,807 ​ $ 264,340 ​ $ 305,623 ​ $ 312,749 ​ ​ (1) The revolving credit facility (the “Credit Facility”) carries a variable interest rate based on LIBOR, plus a margin, that is considered to be priced at market for debt instruments having similar terms and collateral requirements (Level 2 of the fair value hierarchy). (2) Fair value of the notes payable was determined using a present value income approach based on quoted interest rates from lending institutions with which the Company would enter into similar transactions (Level 2 of the fair value hierarchy). (3) ABF Freight’s multiemployer pension plan obligation with the New England Teamsters and Trucking Industry Pension Fund (the “New England Pension Fund”) was restructured under a transition agreement effective on August 1, 2018, which resulted in a related withdrawal liability (see in Note I to the consolidated financial statements in Item 8 of the Company’s 2020 Annual Report on Form 10-K). The fair value of the outstanding withdrawal liability is equal to the present value of the future withdrawal liability payments, discounted at an interest rate of 3.1% and 2.6% at June 30, 2021 and December 31, 2020, respectively, determined using the 20-year U.S. Treasury rate plus a spread (Level 2 of the fair value hierarchy). Included in other long-term liabilities with the current portion included in accrued expenses.
Schedule of financial assets and liabilities measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2021 ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ ​ ​ Quoted Prices Significant Significant ​ ​ ​ ​ ​ In Active ​ Observable ​ Unobservable ​ ​ ​ ​ ​ ​ Markets ​ Inputs ​ Inputs ​ ​ ​ Total (Level 1) (Level 2) (Level 3) ​ ​ (in thousands) ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Money market funds (1) ​ $ 49,101 ​ $ 49,101 ​ $ — ​ $ — ​ Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan (2) ​ 3,306 ​ 3,306 ​ — ​ — ​ Interest rate swaps (3) ​ ​ 354 ​ ​ — ​ ​ 354 ​ ​ — ​ ​ ​ $ 52,761 ​ $ 52,407 ​ $ 354 ​ $ — ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps (3) ​ $ 973 ​ $ — ​ $ 973 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ ​ ​ Quoted Prices Significant Significant ​ ​ ​ ​ ​ In Active ​ Observable ​ Unobservable ​ ​ ​ ​ ​ ​ Markets ​ Inputs ​ Inputs ​ ​ ​ Total (Level 1) (Level 2) (Level 3) ​ ​ (in thousands) ​ Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Money market funds (1) ​ $ 34,201 ​ $ 34,201 ​ $ — ​ $ — ​ Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan (2) ​ 2,955 ​ 2,955 ​ — ​ — ​ ​ ​ $ 37,156 ​ $ 37,156 ​ $ — ​ $ — ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps (3) ​ $ 1,622 ​ $ — ​ $ 1,622 ​ $ — ​ ​ (1) Included in cash and cash equivalents. (2) Nonqualified deferred compensation plan investments consist of U.S. and international equity mutual funds, government and corporate bond mutual funds, and money market funds which are held in a trust with a third-party brokerage firm. Included in other long-term assets, with a corresponding liability reported within other long-term liabilities. (3) Included in other long-term assets or other long-term liabilities. The fair values of the interest rate swaps were determined by discounting future cash flows and receipts based on expected interest rates observed in market interest rate curves adjusted for estimated credit valuation considerations reflecting nonperformance risk of the Company and the counterparty, which are considered to be in Level 3 of the fair value hierarchy. The Company assessed Level 3 inputs as insignificant to the valuation at June 30, 2021 and December 31, 2020 and considers the interest rate swap valuations in Level 2 of the fair value hierarchy.

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS (Tables)	6 Months Ended
	Jun. 30, 2021
GOODWILL AND INTANGIBLE ASSETS
Schedule of goodwill by reportable operating segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ArcBest FleetNet ​ ​ (in thousands) Balances at December 31, 2020 $ 88,320 ​ $ 87,690 ​ $ 630 ​ Goodwill divested (1) ​ (1,952) ​ (1,952) ​ — ​ Balances at June 30, 2021 $ 86,368 $ 85,738 $ 630 (1) Goodwill divested due to the sale of the labor services portion of the ArcBest segment’s moving business was determined based on the relative fair value of the business sold to the total fair value of the reporting unit.
Schedule of intangible assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2021 ​ December 31, 2020 ​ ​ Weighted-Average ​ ​ ​ ​ Accumulated ​ Net ​ ​ ​ ​ Accumulated ​ Net ​ Amortization Period Cost Amortization Value ​ Cost Amortization Value ​ ​ (in years) ​ (in thousands) ​ (in thousands) Finite-lived intangible assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships 14 ​ $ 52,721 ​ $ 32,380 ​ $ 20,341 ​ $ 52,721 ​ $ 30,477 ​ $ 22,244 ​ Other ​ 13 ​ ​ 1,010 ​ ​ 567 ​ ​ 443 ​ ​ 980 ​ ​ 543 ​ ​ 437 ​ ​ 14 ​ 53,731 ​ 32,947 ​ 20,784 ​ ​ 53,701 ​ 31,020 ​ 22,681 ​ Indefinite-lived intangible assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Trade name N/A ​ 32,300 ​ N/A ​ 32,300 ​ ​ 32,300 ​ N/A ​ 32,300 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total intangible assets N/A ​ $ 86,031 ​ $ 32,947 ​ $ 53,084 ​ $ 86,001 ​ $ 31,020 ​ $ 54,981 ​
Schedule of future amortization for intangible assets	​ ​ ​ ​ ​ ​ ​ Amortization of ​ ​ Intangible Assets ​ ​ (in thousands) ​ Remainder of 2021 ​ $ 1,911 ​ 2022 ​ 3,815 ​ 2023 ​ 3,722 ​ 2024 ​ 3,689 ​ 2025 ​ ​ 3,674 ​ Thereafter ​ ​ 3,973 ​ Total amortization ​ $ 20,784 ​

LEASES (Tables)

LEASES (Tables)	6 Months Ended
	Jun. 30, 2021
LEASES
Schedule of components of lease expense	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ ​ June 30 ​ June 30 ​ ​ 2021 2020 2021 2020 ​ ​ (in thousands) ​ Operating lease expense ​ $ 6,584 ​ $ 5,803 ​ $ 13,226 ​ $ 11,599 ​ Variable lease expense ​ ​ 963 ​ ​ 543 ​ ​ 2,295 ​ ​ 1,583 ​ Sublease income ​ ​ (156) ​ ​ (42) ​ ​ (311) ​ ​ (134) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total operating lease expense (1) ​ $ 7,391 ​ $ 6,304 ​ $ 15,210 ​ $ 13,048 ​ (1) Operating lease expense excludes short-term leases with a term of 12 months or less.
Schedule of operating cash flows from operating lease activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended ​ ​ ​ June 30, 2021 ​ June 30, 2020 ​ ​ (in thousands) ​ Noncash change in operating right-of-use assets ​ $ 11,386 ​ $ 11,002 ​ Change in operating lease liabilities ​ ​ (10,625) ​ ​ (11,232) ​ Operating right-of-use-assets and lease liabilities, net ​ $ 761 ​ $ (230) ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for amounts included in the measurement of operating lease liabilities ​ $ (12,446) ​ $ (11,826) ​
Schedule of maturities of operating lease liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Equipment ​ ​ ​ ​ ​ ​ Land and ​ and ​ ​ Total Structures (1) Other ​ (in thousands) ​ Remainder of 2021 ​ $ 13,071 ​ $ 13,071 ​ $ — ​ 2022 ​ 22,759 ​ 22,723 ​ 36 ​ 2023 ​ 18,281 ​ 18,256 ​ 25 ​ 2024 ​ 16,020 ​ 16,020 ​ — ​ 2025 ​ 13,407 ​ 13,407 ​ — ​ Thereafter ​ 44,136 ​ 44,136 ​ — ​ Total lease payments ​ ​ 127,674 ​ ​ 127,613 ​ ​ 61 ​ Less imputed interest ​ ​ (12,913) ​ ​ (12,912) ​ ​ (1) ​ Total ​ $ 114,761 ​ $ 114,701 ​ $ 60 ​ (1) Excludes future minimum lease payments for a lease which was executed but had not yet commenced as of June 30, 2021 of $37.3 million which will be paid over approximately 10 years . The Company plans to take possession of the leased space in third quarter 2022.

LONG-TERM DEBT AND FINANCING _2

LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Tables)	6 Months Ended
	Jun. 30, 2021
LONG-TERM DEBT AND FINANCING ARRANGEMENTS
Schedule of long-term debt	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 ​ December 31 ​ ​ 2021 2020 ​ ​ (in thousands) ​ Credit Facility (interest rate of 1.2% (1) ​ $ 50,000 ​ $ 70,000 ​ Notes payable (weighted-average interest rate of 2.9% at June 30, 2021) ​ 187,715 ​ 214,216 ​ Finance lease obligations (weighted-average interest rate of 3.3% at June 30, 2021) ​ 4 ​ 8 ​ ​ ​ 237,719 ​ 284,224 ​ Less current portion ​ 66,644 ​ 67,105 ​ Long-term debt, less current portion ​ $ 171,075 ​ $ 217,119 ​ ​ (1) The interest rate swap mitigates interest rate risk by effectively converting the $50.0 million of borrowings under the Credit Facility from variable-rate interest to fixed-rate interest with a per annum rate of 3.12% based on the margin of the Credit Facility as of both June 30, 2021 and December 31, 2020. ​ ​
Scheduled maturities of long-term debt obligations	Scheduled maturities, including interest payments, of long-term debt obligations as of June 30, 2021 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Credit ​ Notes ​ Finance Lease ​ ​ Total Facility (1) Payable Obligations ​ (in thousands) ​ Due in one year or less $ 71,778 $ 637 $ 71,137 ​ $ 4 ​ Due after one year through two years ​ 57,710 ​ 784 ​ 56,926 ​ — ​ Due after two years through three years ​ 42,571 ​ 1,049 ​ 41,522 ​ — ​ Due after three years through four years ​ 72,345 ​ 50,296 ​ 22,049 ​ — ​ Due after four years through five years ​ 4,567 ​ — ​ 4,567 ​ — ​ Due after five years ​ ​ 124 ​ ​ — ​ ​ 124 ​ ​ — ​ Total payments ​ 249,095 ​ 52,766 ​ 196,325 ​ 4 ​ Less amounts representing interest ​ 11,376 ​ 2,766 ​ 8,610 ​ — ​ Long-term debt $ 237,719 $ 50,000 $ 187,715 ​ $ 4 ​ ​ (1) The future interest payments included in the scheduled maturities due are calculated using variable interest rates based on the LIBOR swap curve, plus the anticipated applicable margin.
Schedule of assets securing notes payable or held under capital leases	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 ​ December 31 ​ ​ 2021 2020 ​ ​ (in thousands) Revenue equipment $ 326,914 $ 326,823 ​ Service, office, and other equipment ​ ​ 26,250 ​ ​ 26,270 ​ Total assets securing notes payable or held under finance leases ​ 353,164 ​ 353,093 ​ Less accumulated depreciation and amortization (1) ​ 135,538 ​ 115,424 ​ Net assets securing notes payable or held under finance leases ​ $ 217,626 ​ $ 237,669 ​ ​ ​ (1) Amortization of assets held under finance leases and depreciation of assets securing notes payable are included in depreciation expense. ​

PENSION AND OTHER POSTRETIREMEN

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)	6 Months Ended
	Jun. 30, 2021
POSTRETIREMENT BENEFIT PLANS
Summary of the components of net periodic benefit cost	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30 ​ ​ ​ Supplemental ​ Postretirement ​ ​ ​ Benefit Plan ​ Health Benefit Plan ​ ​ 2021 2020 2021 2020 ​ ​ (in thousands) ​ Service cost ​ $ — ​ $ — ​ $ 48 ​ $ 47 ​ Interest cost ​ 1 ​ 2 ​ 107 ​ 144 ​ Amortization of net actuarial (gain) loss (1) ​ 3 ​ 1 ​ (137) ​ (149) ​ Net periodic benefit cost (2) ​ $ 4 ​ $ 3 ​ $ 18 ​ $ 42 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30 ​ ​ ​ Supplemental ​ Postretirement ​ ​ ​ Benefit Plan ​ Health Benefit Plan ​ ​ 2021 2020 2021 (2) 2020 ​ ​ (in thousands) ​ Service cost ​ $ — ​ $ — ​ $ 96 ​ $ 94 ​ Interest cost ​ 2 ​ 5 ​ 214 ​ 288 ​ Amortization of prior service credit ​ — ​ — ​ — ​ — ​ Pension settlement expense (3) ​ — ​ 89 ​ — ​ — ​ Amortization of net actuarial (gain) loss (1) ​ 5 ​ 5 ​ (274) ​ (298) ​ Net periodic benefit cost (2) ​ $ 7 ​ $ 99 ​ $ 36 ​ $ 84 ​ ​ (1) The Company amortizes actuarial gains and losses over the average remaining active service period of the plan participants and does not use a corridor approach. (2) Service cost is reported within operating expenses and the other components of net periodic benefit cost (including pension settlement expense) are reported within the other line item of other income (costs) in the consolidated statements of operations. (3) For the six months ended June 30, 2020, pension settlement expense for the supplemental benefit plan of $0.1 million (pre-tax), or $0.1 million (after-tax), was due to a $0.7 million benefit related to an officer retirement.

STOCKHOLDERS' EQUITY (Tables)

STOCKHOLDERS' EQUITY (Tables)	6 Months Ended
	Jun. 30, 2021
STOCKHOLDERS' EQUITY
Components of accumulated other comprehensive income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30 December 31 ​ ​ 2021 2020 ​ ​ (in thousands) ​ Pre-tax amounts: ​ ​ ​ ​ ​ ​ ​ Unrecognized net periodic benefit credit ​ $ 4,121 ​ $ 4,390 ​ Interest rate swap ​ ​ (618) ​ ​ (1,622) ​ Foreign currency translation ​ 92 ​ (1,182) ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 3,595 ​ $ 1,586 ​ ​ ​ ​ ​ ​ ​ ​ ​ After-tax amounts: ​ ​ ​ ​ ​ ​ ​ Unrecognized net periodic benefit credit ​ $ 3,060 ​ $ 3,260 ​ Interest rate swap ​ ​ (457) ​ ​ (1,198) ​ Foreign currency translation ​ 69 ​ (872) ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 2,672 ​ $ 1,190 ​
Summary of changes in accumulated other comprehensive income (loss), net of tax, by component	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unrecognized ​ ​ Interest Foreign ​ ​ ​ ​ ​ ​ Net Periodic ​ ​ Rate ​ Currency ​ ​ Total Benefit Costs ​ Swap Translation ​ ​ (in thousands) ​ Balances at December 31, 2020 ​ $ 1,190 ​ $ 3,260 ​ $ (1,198) ​ $ (872) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income before reclassifications ​ 1,682 ​ — ​ ​ 741 ​ 941 ​ Amounts reclassified from accumulated other comprehensive loss ​ (200) ​ (200) ​ ​ — ​ — ​ Net current-period other comprehensive income (loss) ​ 1,482 ​ (200) ​ ​ 741 ​ 941 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at June 30, 2021 ​ $ 2,672 ​ $ 3,060 ​ $ (457) ​ $ 69 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at December 31, 2019 ​ ​ 203 ​ ​ 2,152 ​ ​ (416) ​ ​ (1,533) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive loss before reclassifications ​ ​ (2,142) ​ ​ (8) ​ ​ (1,171) ​ ​ (963) ​ Amounts reclassified from accumulated other comprehensive income ​ ​ (151) ​ ​ (151) ​ ​ — ​ ​ — ​ Net current-period other comprehensive loss ​ ​ (2,293) ​ ​ (159) ​ ​ (1,171) ​ ​ (963) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balances at June 30, 2020 ​ $ (2,090) ​ $ 1,993 ​ $ (1,587) ​ $ (2,496) ​ ​
Summary of the significant reclassifications out of accumulated other comprehensive income (loss) by component	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unrecognized Net Periodic ​ ​ ​ Benefit Credit (1)(2) ​ ​ Six Months Ended June 30 ​ ​ 2021 2020 ​ ​ (in thousands) Amortization of net actuarial gain ​ $ 269 ​ $ 293 ​ Pension settlement expense (3) ​ ​ — ​ (89) ​ Total, pre-tax ​ ​ 269 ​ 204 ​ Tax expense ​ ​ (69) ​ (53) ​ Total, net of tax ​ $ 200 ​ $ 151 ​ ​ (1) Amounts in parentheses indicate increases in expense or loss. (2) These components of accumulated other comprehensive income are included in the computation of net periodic benefit cost as disclosed in Note G. (3) For the six months ended June 30, 2020, pension settlement expense is related to the supplemental benefit plan (see Note G).
Summary of dividends declared	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ Per Share Amount Per Share Amount ​ ​ (in thousands, except per share data) First quarter ​ $ 0.08 ​ $ 2,037 ​ $ 0.08 ​ $ 2,033 ​ Second quarter ​ $ 0.08 ​ $ 2,058 ​ $ 0.08 ​ $ 2,049 ​

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	6 Months Ended
	Jun. 30, 2021
EARNINGS PER SHARE
Schedule of computation of basic and diluted earnings (loss) per share	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ ​ June 30 ​ June 30 ​ ​ 2021 2020 2021 2020 ​ ​ (in thousands, except share and per share data) ​ Basic ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 60,981 ​ $ 15,880 ​ $ 84,342 ​ $ 17,782 ​ Effect of unvested restricted stock awards ​ — ​ (17) ​ — ​ (18) ​ Adjusted net income ​ $ 60,981 ​ $ 15,863 ​ $ 84,342 ​ $ 17,764 ​ Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares ​ 25,586,353 ​ 25,463,559 ​ 25,522,453 ​ 25,468,624 ​ Earnings per common share ​ $ 2.38 ​ $ 0.62 ​ $ 3.30 ​ $ 0.70 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 60,981 ​ $ 15,880 ​ $ 84,342 ​ $ 17,782 ​ Effect of unvested restricted stock awards ​ — ​ (17) ​ — ​ (18) ​ Adjusted net income ​ $ 60,981 ​ $ 15,863 ​ $ 84,342 ​ $ 17,764 ​ Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares ​ 25,586,353 ​ 25,463,559 ​ 25,522,453 ​ 25,468,624 ​ Effect of dilutive securities ​ 1,324,443 ​ 754,398 ​ 1,403,680 ​ 783,862 ​ Adjusted weighted-average shares and assumed conversions ​ 26,910,796 ​ 26,217,957 ​ 26,926,133 ​ 26,252,486 ​ Earnings per common share ​ $ 2.27 ​ $ 0.61 ​ $ 3.13 ​ $ 0.68 ​

OPERATING SEGMENT DATA (Tables)

OPERATING SEGMENT DATA (Tables)	6 Months Ended
	Jun. 30, 2021
OPERATING SEGMENT DATA
Schedule of reportable operating segment information	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ June 30 ​ June 30 ​ 2021 2020 2021 2020 ​ ​ (in thousands) REVENUES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 652,832 ​ $ 460,070 $ 1,209,124 $ 975,783 ​ ArcBest ​ 270,748 ​ 151,467 ​ 523,084 ​ 316,242 ​ FleetNet ​ 59,547 ​ 46,440 ​ 118,710 ​ 98,879 ​ Other and eliminations ​ (34,154) ​ (30,607) ​ (72,732) ​ (62,135) ​ Total consolidated revenues $ 948,973 $ 627,370 $ 1,778,186 $ 1,328,769 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPERATING EXPENSES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Salaries, wages, and benefits ​ $ 302,370 ​ $ 248,995 $ 588,064 $ 532,833 ​ Fuel, supplies, and expenses ​ 64,689 ​ 45,675 ​ 125,530 ​ 106,900 ​ Operating taxes and licenses ​ 12,303 ​ 11,629 ​ 24,551 ​ 24,423 ​ Insurance ​ 9,454 ​ 8,247 ​ 18,393 ​ 16,071 ​ Communications and utilities ​ 4,663 ​ 4,342 ​ 9,633 ​ 9,053 ​ Depreciation and amortization ​ 23,308 ​ 23,327 ​ 46,792 ​ 46,597 ​ Rents and purchased transportation ​ 95,082 ​ 46,152 ​ 170,670 ​ 101,922 ​ Shared services ​ ​ 69,372 ​ ​ 45,605 ​ ​ 125,238 ​ ​ 94,490 ​ Gain on sale of property and equipment (1) ​ 71 ​ (1,175) ​ (8,624) ​ (3,339) ​ Innovative technology costs (2) ​ 7,532 ​ 4,789 ​ 14,400 ​ 9,322 ​ Other ​ 77 ​ 1,448 ​ 511 ​ 3,235 ​ Total Asset-Based ​ 588,921 ​ 439,034 ​ ​ 1,115,158 ​ ​ 941,507 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ArcBest ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchased transportation ​ 226,603 ​ 125,090 ​ 437,598 ​ 262,272 ​ Supplies and expenses ​ 2,476 ​ 1,989 ​ 5,044 ​ 4,269 ​ Depreciation and amortization ​ 2,366 ​ 2,449 ​ 4,752 ​ 4,919 ​ Shared services ​ ​ 29,078 ​ ​ 18,840 ​ ​ 55,150 ​ ​ 40,567 ​ Gain on sale of subsidiaries (3) ​ ​ (6,923) ​ ​ — ​ ​ (6,923) ​ ​ — ​ Other ​ ​ 2,021 ​ 1,796 ​ ​ 4,071 ​ ​ 4,321 ​ Total ArcBest ​ 255,621 ​ 150,164 ​ 499,692 ​ 316,348 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ FleetNet ​ 58,409 ​ 45,658 ​ 116,549 ​ 97,057 ​ Other and eliminations ​ (28,277) ​ (27,911) (59,703) ​ (54,387) ​ Total consolidated operating expenses ​ $ 874,674 ​ $ 606,945 ​ $ 1,671,696 ​ $ 1,300,525 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPERATING INCOME ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 63,911 ​ $ 21,036 ​ $ 93,966 ​ $ 34,276 ​ ArcBest ​ 15,127 ​ 1,303 ​ 23,392 ​ (106) ​ FleetNet ​ 1,138 ​ 782 ​ 2,161 ​ 1,822 ​ Other and eliminations ​ (5,877) ​ (2,696) ​ $ (13,029) ​ $ (7,748) ​ Total consolidated operating income ​ $ 74,299 ​ $ 20,425 ​ ​ 106,490 ​ ​ 28,244 ​ OTHER INCOME (COSTS) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest and dividend income ​ $ 322 ​ $ 991 ​ $ 714 ​ $ 2,366 ​ Interest and other related financing costs ​ (2,274) ​ (3,378) ​ (4,702) ​ (6,325) ​ Other, net (4) ​ 1,111 ​ 2,696 ​ 2,303 ​ (1,166) ​ Total other income (costs) ​ (841) ​ 309 ​ (1,685) ​ (5,125) ​ INCOME BEFORE INCOME TAXES ​ $ 73,458 ​ $ 20,734 ​ $ 104,805 ​ $ 23,119 ​ ​ ​ (1) The six months ended June 30, 2021 includes an $8.6 million gain on the sale of an unutilized service center property. (2) Represents costs associated with the freight handling pilot test program at ABF Freight. (3) Gain recognized for the three and six months ended June 30, 2021 relates to the sale of the labor services portion of the ArcBest segment’s moving business in May 2021. (4) Includes the components of net periodic benefit cost other than service cost related to the Company’s SBP and postretirement plans (see Note G) and proceeds and changes in cash surrender value of life insurance policies. ​
Schedule of revenues from customers and intersegment revenues	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ June 30 ​ June 30 ​ 2021 2020 2021 2020 ​ ​ (in thousands) Revenues from customers ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 630,145 ​ $ 439,585 $ 1,159,869 $ 935,313 ​ ArcBest ​ 268,038 ​ 149,683 ​ 518,279 ​ 312,631 ​ FleetNet ​ 49,951 ​ 37,245 ​ 98,385 ​ 78,989 ​ Other ​ 839 ​ 857 ​ 1,653 ​ 1,836 ​ Total consolidated revenues $ 948,973 $ 627,370 $ 1,778,186 $ 1,328,769 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Intersegment revenues ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 22,687 ​ $ 20,485 ​ $ 49,255 ​ $ 40,470 ​ ArcBest ​ ​ 2,710 ​ ​ 1,784 ​ ​ 4,805 ​ ​ 3,611 ​ FleetNet ​ ​ 9,596 ​ ​ 9,195 ​ ​ 20,325 ​ ​ 19,890 ​ Other and eliminations ​ ​ (34,993) ​ ​ (31,464) ​ ​ (74,385) ​ ​ (63,971) ​ Total intersegment revenues ​ $ — $ — $ — $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total segment revenues ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-Based ​ $ 652,832 ​ $ 460,070 ​ $ 1,209,124 ​ $ 975,783 ​ ArcBest ​ ​ 270,748 ​ ​ 151,467 ​ ​ 523,084 ​ ​ 316,242 ​ FleetNet ​ ​ 59,547 ​ ​ 46,440 ​ ​ 118,710 ​ ​ 98,879 ​ Other and eliminations ​ ​ (34,154) ​ ​ (30,607) ​ ​ (72,732) ​ ​ (62,135) ​ Total consolidated revenues ​ $ 948,973 ​ $ 627,370 ​ $ 1,778,186 ​ $ 1,328,769 ​
Schedule of consolidated operating expenses by component	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ June 30 ​ June 30 ​ ​ 2021 2020 2021 2020 ​ (in thousands) ​ OPERATING EXPENSES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Salaries, wages, and benefits ​ $ 389,146 ​ $ 305,220 ​ $ 748,541 ​ $ 650,166 ​ Rents, purchased transportation, and other costs of services ​ 347,760 ​ 187,914 ​ 657,098 ​ 404,942 ​ Fuel, supplies, and expenses ​ 80,020 ​ 54,838 ​ 153,169 ​ 126,611 ​ Depreciation and amortization (1) ​ 30,282 ​ 29,086 ​ 60,636 ​ 58,099 ​ Other (2) ​ 27,466 ​ 29,887 ​ 52,252 ​ 60,707 ​ ​ ​ $ 874,674 ​ $ 606,945 ​ $ 1,671,696 ​ $ 1,300,525 ​ (1) Includes amortization of intangible assets. (2) The three and six months ended June 30, 2021 includes a $6.9 million gain related to the sale of a subsidiary within the ArcBest segment. The six months ended June 30, 2021 also includes an $8.6 million gain related to the sale of an unutilized service center property within the Asset-Based segment.

ORGANIZATION AND DESCRIPTION _3

ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION - Organization (Details)	6 Months Ended
	Jun. 30, 2021segment
Organization and description of business
Number of reportable operating segments	3
Asset Based
Organization and description of business
Percentage of the Company's revenues, before other revenues and intercompany eliminations, represented by the Asset-Based segment	65.00%
Asset Based | Unionized employees concentration risk | Number of employees
Organization and description of business
Percentage of Asset-Based segment employees covered under collective bargaining agreement with the IBT	82.00%

FINANCIAL INSTRUMENTS AND FAI_3

FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Cash and Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair value disclosure
Cash and cash equivalents	$ 362,619	$ 303,954
Short-term investments	59,967	65,408
Concentrations of Credit Risk of Financial Instruments
Cash, cash equivalents and short-term investments not FDIC-insured	132,500	156,400
Cash deposits
Fair value disclosure
Cash and cash equivalents	284,265	240,687
Variable rate demand notes
Fair value disclosure
Cash and cash equivalents	29,253	29,066
Money market funds
Fair value disclosure
Cash and cash equivalents	49,101	34,201
Certificates of deposit
Fair value disclosure
Short-term investments	$ 59,967	53,297
U.S. Treasury securities
Fair value disclosure
Short-term investments		$ 12,111

FINANCIAL INSTRUMENTS AND FAI_4

FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Debt (Details) $ in Thousands	Jun. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Carrying Value
Fair value disclosure
Financial instruments	$ 258,807	$ 305,623
Fair Value
Fair value disclosure
Financial instruments	264,340	312,749
Credit Facility | Carrying Value | Level 2
Fair value disclosure
Financial instruments	50,000	70,000
Credit Facility | Fair Value | Level 2
Fair value disclosure
Financial instruments	50,000	70,000
Notes payable | Carrying Value | Level 2
Fair value disclosure
Financial instruments	187,715	214,216
Notes payable | Fair Value | Level 2
Fair value disclosure
Financial instruments	$ 190,519	$ 217,226
New England Pension Fund withdrawal liability | Discount Rate
Fair value disclosure
Measurement input	0.031	0.026
New England Pension Fund withdrawal liability | Carrying Value | Level 2
Fair value disclosure
Financial instruments	$ 21,092	$ 21,407
New England Pension Fund withdrawal liability | Fair Value | Level 2
Fair value disclosure
Financial instruments	$ 23,821	$ 25,523

FINANCIAL INSTRUMENTS AND FAI_5

FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities (Details) - Recurring basis - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Assets	$ 52,761	$ 37,156
Cash and cash equivalents
Assets:
Money market funds	49,101	34,201
Other long-term assets
Assets:
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan	3,306	2,955
Interest rate swaps	354
Other long-term liabilities
Liabilities:
Interest rate swap	973	1,622
Level 1
Assets:
Assets	52,407	37,156
Level 1 | Cash and cash equivalents
Assets:
Money market funds	49,101	34,201
Level 1 | Other long-term assets
Assets:
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan	3,306	2,955
Level 2
Assets:
Assets	354
Level 2 | Other long-term assets
Assets:
Interest rate swaps	354
Level 2 | Other long-term liabilities
Liabilities:
Interest rate swap	$ 973	$ 1,622

GOODWILL AND INTANGIBLE ASSET_2

GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Goodwill by reportable operating segment
Balance at the beginning of the period	$ 88,320
Goodwill divested	(1,952)
Balance at the end of the period	86,368
ArcBest
Goodwill by reportable operating segment
Balance at the beginning of the period	87,690
Goodwill divested	(1,952)
Balance at the end of the period	85,738
FleetNet
Goodwill by reportable operating segment
Balance at the beginning of the period	630
Balance at the end of the period	$ 630

GOODWILL AND INTANGIBLE ASSET_3

GOODWILL AND INTANGIBLE ASSETS - Intangible (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Finite-lived intangible assets
Weighted Average Amortization Period	14 years
Cost	$ 53,731	$ 53,701
Accumulated Amortization	32,947	31,020
Net Value	20,784	22,681
Total intangible assets
Cost	86,031	86,001
Net Value	53,084	54,981
Trade name
Indefinite-lived intangible assets
Net Value	$ 32,300	32,300
Customer relationships
Finite-lived intangible assets
Weighted Average Amortization Period	14 years
Cost	$ 52,721	52,721
Accumulated Amortization	32,380	30,477
Net Value	$ 20,341	22,244
Other intangible assets
Finite-lived intangible assets
Weighted Average Amortization Period	13 years
Cost	$ 1,010	980
Accumulated Amortization	567	543
Net Value	$ 443	$ 437

GOODWILL AND INTANGIBLE ASSET_4

GOODWILL AND INTANGIBLE ASSETS - Amortization (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Future amortization for intangible assets
Remainder of 2021	$ 1,911
2022	3,815
2023	3,722
2024	3,689
2025	3,674
Thereafter	3,973
Net Value	$ 20,784	$ 22,681

INCOME TAXES - Tax Rate (Detail

INCOME TAXES - Tax Rate (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
INCOME TAXES
Effective tax rate (as a percent)	17.00%	23.40%	19.50%	23.10%
State tax, low end of range of rate (as a percent)			6.00%
State tax, high end of range of rate (as a percent)			6.50%

INCOME TAXES - Allowance (Detai

INCOME TAXES - Allowance (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Deferred tax assets:
Valuation allowance	$ 1.4	$ 1.3

INCOME TAXES - Taxes Paid (Deta

INCOME TAXES - Taxes Paid (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Federal and state
Income taxes
Income tax refunds received (in dollars)		$ 0.4
Federal and state | Maximum
Income taxes
Income tax refunds received (in dollars)	$ 0.1
Federal, state and foreign
Income taxes
Income taxes paid (in dollars)	$ 15.3
State and foreign
Income taxes
Income taxes paid (in dollars)		$ 2.3

LEASES - Components of Lease Ex

LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
LEASES
Operating lease expense	$ 6,584	$ 5,803	$ 13,226	$ 11,599
Variable lease expense	963	543	2,295	1,583
Sublease income	(156)	(42)	(311)	(134)
Total operating lease expense	$ 7,391	$ 6,304	$ 15,210	$ 13,048

LEASES - Cash flows (Details)

LEASES - Cash flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating leases
Noncash change in operating right-of-use assets	$ 11,386	$ 11,002
Change in operating lease liabilities	(10,625)	(11,232)
Operating right-of-use assets and lease liabilities, net	761	(230)
Cash paid for amounts included in the measurement of operating lease liabilities	$ (12,446)	$ (11,826)

LEASES - Maturities of Operatin

LEASES - Maturities of Operating Lease Liabilities (Details) $ in Thousands	Jun. 30, 2021USD ($)
Maturities of operating lease liabilities
Remainder of 2021	$ 13,071
2022	22,759
2023	18,281
2024	16,020
2025	13,407
Thereafter	44,136
Total lease payments	127,674
Less imputed interest	(12,913)
Total operating lease liabilities	114,761
Land and Structures
Maturities of operating lease liabilities
Remainder of 2021	13,071
2022	22,723
2023	18,256
2024	16,020
2025	13,407
Thereafter	44,136
Total lease payments	127,613
Less imputed interest	(12,912)
Total operating lease liabilities	114,701
Equipment and Others
Maturities of operating lease liabilities
2022	36
2023	25
Total lease payments	61
Less imputed interest	(1)
Total operating lease liabilities	60
Land and Structures - 10 years
Maturities of operating lease liabilities
Future minimum payments for leases that have not yet commenced	$ 37,300
Lease term for lease commitments that have not yet commenced	10 years

LONG-TERM DEBT AND FINANCING _3

LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Long-term debt obligations
Long-term debt	$ 237,719	$ 284,224
Less current portion	66,644	67,105
Long-term debt, less current portion	171,075	217,119
Payments under long-term debt obligations
Due in one year or less	71,778
Due after one year through two years	57,710
Due after two years through three years	42,571
Due after three years through four years	72,345
Due after four years through five years	4,567
Due after five years	124
Total payments	249,095
Less amounts representing interest	11,376
Long-term debt	237,719	284,224
Credit Facility
Long-term debt obligations
Long-term debt	$ 50,000	70,000
Interest rate (as a percent)	1.20%
Payments under long-term debt obligations
Due in one year or less	$ 637
Due after one year through two years	784
Due after two years through three years	1,049
Due after three years through four years	50,296
Total payments	52,766
Less amounts representing interest	2,766
Long-term debt	50,000	70,000
Credit Facility | Interest rate swap agreement, maturing on June 30, 2022
Long-term debt obligations
Amount of borrowings covered by the interest rate swap	$ 50,000	$ 50,000
Effective fixed interest rate on hedged borrowings (as a percent)	3.12%	3.12%
Notes payable
Long-term debt obligations
Long-term debt	$ 187,715	$ 214,216
Weighted-average interest rate (as a percent)	2.90%
Payments under long-term debt obligations
Due in one year or less	$ 71,137
Due after one year through two years	56,926
Due after two years through three years	41,522
Due after three years through four years	22,049
Due after four years through five years	4,567
Due after five years	124
Total payments	196,325
Less amounts representing interest	8,610
Long-term debt	187,715	214,216
Finance lease obligations
Long-term debt obligations
Long-term debt	$ 4	8
Weighted-average interest rate (as a percent)	3.30%
Payments under long-term debt obligations
Due in one year or less	$ 4
Total payments	4
Long-term debt	$ 4	$ 8

LONG-TERM DEBT AND FINANCING _4

LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Assets securing notes (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Arrangements
Total assets securing notes payable or held under finance leases	$ 353,164	$ 353,093
Less accumulated depreciation and amortization	135,538	115,424
Net assets securing notes payable or held under finance leases	217,626	237,669
Revenue equipment
Financing Arrangements
Total assets securing notes payable or held under finance leases	326,914	326,823
Service, office, and other equipment
Financing Arrangements
Total assets securing notes payable or held under finance leases	$ 26,250	$ 26,270

LONG-TERM DEBT AND FINANCING _5

LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Credit Facility (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Financing Arrangements
Repayment of debt		$ 54,643	$ 29,185
Outstanding letters of credit	$ 11,200	11,200
Credit Facility
Financing Arrangements
Maximum borrowing capacity	250,000	250,000
Additional borrowing capacity that may be requested	125,000	125,000
Repayment of debt	20,000
Outstanding letters of credit	600	600
Remaining borrowing capacity	199,400	199,400
Swing Line Facility
Financing Arrangements
Maximum borrowing capacity	25,000	25,000
Letters of Credit, Sub-Facility
Financing Arrangements
Maximum borrowing capacity	20,000	20,000
Outstanding letters of credit	$ 600	$ 600

LONG-TERM DEBT AND FINANCING _6

LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Interest rate swaps (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2020	Jan. 02, 2020
Interest rate swap agreement, maturing on June 30, 2022
Financing Arrangements
Notional amount				$ 50
Fixed interest rate payments (as a percent)				1.99%
Interest rate swap agreement, maturing on June 30, 2022 | Other long-term liabilities
Financing Arrangements
Fair value of interest rate swap, liability		$ 1	$ 1.4
Interest rate swap agreement, maturing on June 30, 2022 | Credit Facility
Financing Arrangements
Amount of borrowings covered by the interest rate swap		$ 50	$ 50
Effective fixed interest rate on hedged borrowings (as a percent)		3.12%	3.12%
Amended interest rate swap agreement, maturing on October 1, 2024
Financing Arrangements
Notional amount		$ 50
Fixed interest rate payments (as a percent)		0.43%
Amended interest rate swap agreement, maturing on October 1, 2024 | Other long-term liabilities
Financing Arrangements
Fair value of interest rate swap, liability			$ 0.2
Amended interest rate swap agreement, maturing on October 1, 2024 | Other long-term assets
Financing Arrangements
Fair value of interest rate swap, asset		$ 0.4
Amended interest rate swap agreement, maturing on October 1, 2024 | Credit Facility | Forecast
Financing Arrangements
Amount of borrowings covered by the interest rate swap	$ 50
Effective fixed interest rate on hedged borrowings (as a percent)	1.56%

LONG-TERM DEBT AND FINANCING _7

LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Securitization program (Details) - USD ($) $ in Millions	Jun. 30, 2021	May 31, 2021
Financing Arrangements
Outstanding letters of credit	$ 11.2
Accounts receivable securitization borrowings
Financing Arrangements
Maximum borrowing capacity	50	$ 125
Additional borrowing capacity that may be requested	100	$ 25
Outstanding letters of credit	10.1
Remaining borrowing capacity	$ 39.9

LONG-TERM DEBT AND FINANCING _8

LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Letters of credit & Surety bonds (Details) $ in Millions	Jun. 30, 2021USD ($)
Financing Arrangements
Outstanding letters of credit	$ 11.2
Accounts receivable securitization borrowings
Financing Arrangements
Outstanding letters of credit	10.1
Credit Facility
Financing Arrangements
Outstanding letters of credit	0.6
Surety bonds
Financing Arrangements
Outstanding surety bonds under uncollateralized bond programs	$ 61.6

LONG-TERM DEBT AND FINANCING _9

LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Notes Payable (Details) - Notes payable - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Aug. 02, 2021	Jun. 30, 2021
Financing Arrangements
Assets financed during the period under promissory note arrangements		$ 8.1
Subsequent Event
Financing Arrangements
Assets financed during the period under promissory note arrangements	$ 12.9

POSTRETIREMENT BENEFIT PLANS -

POSTRETIREMENT BENEFIT PLANS - Components of cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Components of net periodic benefit cost
Pension settlement expense				$ 89
Supplemental Benefit Plan
Components of net periodic benefit cost
Interest cost	$ 1	$ 2	$ 2	5
Pension settlement expense				89
Amortization of net actuarial (gain) loss	3	1	5	5
Net periodic benefit cost	4	3	7	99
Postretirement Health Benefit Plan
Components of net periodic benefit cost
Service cost	48	47	96	94
Interest cost	107	144	214	288
Amortization of net actuarial (gain) loss	(137)	(149)	(274)	(298)
Net periodic benefit cost	$ 18	$ 42	$ 36	$ 84

POSTRETIREMENT BENEFIT PLANS _2

POSTRETIREMENT BENEFIT PLANS - Additional information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Postretirement benefit plans
Pension settlement expense	$ 89
Pension settlement expense, net of tax	66
Supplemental Benefit Plan
Postretirement benefit plans
Pension settlement expense	89
Pension settlement expense, net of tax	100
Benefit related to an officer retirement	$ 700

POSTRETIREMENT BENEFIT PLANS _3

POSTRETIREMENT BENEFIT PLANS - Multiemployer Plans (Details) - Nonunion Defined Benefit Pension Plan - Asset Based - plan	6 Months Ended
	Jun. 30, 2021	Jan. 01, 2020
Multiemployer Plans
Number of multiemployer plans to which ABF Freight currently contributes	25
Maximum projected time to insolvency for plans in "critical and declining" status	14 years
Maximum projected time to insolvency for plans in "critical and declining" status if additional criteria apply	19 years
Threshold ratio of inactive to active participants for greater insolvency period to determine "critical and declining" status	2
Threshold funded percentage for greater insolvency period to determine "critical and declining" status	80.00%
Central States Pension Plan
Multiemployer Plans
Approximate proportion of multiemployer pension plan contributions (as a percent)	50.00%
Actuarially certified projected funded percentage of multiemployer pension plan		19.50%

STOCKHOLDERS' EQUITY - AOCI (De

STOCKHOLDERS' EQUITY - AOCI (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income
Total after-tax amount	$ 898,134	$ 851,909	$ 828,593	$ 775,091	$ 759,206	$ 763,043
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income
Total pre-tax amount	3,595		1,586
Total after-tax amount	2,672	$ 1,994	1,190	(2,090)	$ (2,264)	203
Unrecognized Net Periodic Benefit Credit
Accumulated Other Comprehensive Income
Total pre-tax amount	4,121		4,390
Total after-tax amount	3,060		3,260	1,993		2,152
Interest Rate Swap
Accumulated Other Comprehensive Income
Total pre-tax amount	(618)		(1,622)
Total after-tax amount	(457)		(1,198)	(1,587)		(416)
Foreign Currency Translation
Accumulated Other Comprehensive Income
Total pre-tax amount	92		(1,182)
Total after-tax amount	$ 69		$ (872)	$ (2,496)		$ (1,533)

STOCKHOLDERS' EQUITY - AOCI com

STOCKHOLDERS' EQUITY - AOCI components (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances	$ 851,909	$ 828,593	$ 759,206	$ 763,043	$ 828,593	$ 763,043
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	678	804	174	(2,467)	1,482	(2,293)
Balances	898,134	851,909	775,091	759,206	898,134	775,091
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances	1,994	1,190	(2,264)	203	1,190	203
Other comprehensive income (loss) before reclassifications					1,682	(2,142)
Amounts reclassified from accumulated other comprehensive income (loss)					(200)	(151)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	678	804	174	(2,467)	1,482	(2,293)
Balances	2,672	1,994	(2,090)	(2,264)	2,672	(2,090)
Unrecognized Net Periodic Benefit Credit
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances		3,260		2,152	3,260	2,152
Other comprehensive income (loss) before reclassifications						(8)
Amounts reclassified from accumulated other comprehensive income (loss)					(200)	(151)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax					(200)	(159)
Balances	3,060		1,993		3,060	1,993
Interest Rate Swap
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances		(1,198)		(416)	(1,198)	(416)
Other comprehensive income (loss) before reclassifications					741	(1,171)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax					741	(1,171)
Balances	(457)		(1,587)		(457)	(1,587)
Foreign Currency Translation
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances		$ (872)		$ (1,533)	(872)	(1,533)
Other comprehensive income (loss) before reclassifications					941	(963)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax					941	(963)
Balances	$ 69		$ (2,496)		$ 69	$ (2,496)

STOCKHOLDERS' EQUITY - Reclass

STOCKHOLDERS' EQUITY - Reclass (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Unrecognized Net Periodic Benefit Credit
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	$ 269	$ 204
Tax benefit (expense)	(69)	(53)
Total, net of tax	200	151
Amortization of net actuarial gain
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	$ 269	293
Pension settlement expense, including termination expense
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax		$ (89)

STOCKHOLDERS' EQUITY - Dividend

STOCKHOLDERS' EQUITY - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 27, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Dividends on Common Stock
Dividends declared (in dollars per share)		$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.16	$ 0.16
Dividend Amount		$ 2,058	$ 2,037	$ 2,049	$ 2,033
Subsequent Event
Dividends on Common Stock
Dividends declared (in dollars per share)	$ 0.08

STOCKHOLDERS' EQUITY - Treasury

STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jan. 28, 2021	Dec. 31, 2020
Treasury Stock
Aggregate cost of shares repurchased during the period	$ 8,100	$ 3,162
Stock Repurchase Program
Treasury Stock
Amount of stock repurchases authorized			$ 50,000
Number of shares repurchased during the period	126,289
Aggregate cost of shares repurchased during the period	$ 8,100
Amount available for repurchase	$ 41,900			$ 6,600

EARNINGS PER SHARE - Basic and

EARNINGS PER SHARE - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic, numerator:
Net income	$ 60,981	$ 23,361	$ 15,880	$ 1,902	$ 84,342	$ 17,782
Effect of unvested restricted stock unit awards			(17)			(18)
Adjusted net income	$ 60,981		$ 15,863		$ 84,342	$ 17,764
Basic, denominator:
Weighted-average shares	25,586,353		25,463,559		25,522,453	25,468,624
Earnings per common share (in dollars per share)	$ 2.38		$ 0.62		$ 3.30	$ 0.70
Diluted, numerator:
Net income	$ 60,981	$ 23,361	$ 15,880	$ 1,902	$ 84,342	$ 17,782
Effect of unvested restricted stock unit awards			(17)			(18)
Adjusted net income	$ 60,981		$ 15,863		$ 84,342	$ 17,764
Diluted, denominator:
Weighted-average shares	25,586,353		25,463,559		25,522,453	25,468,624
Effect of dilutive securities	1,324,443		754,398		1,403,680	783,862
Adjusted weighted-average shares and assumed conversions	26,910,796		26,217,957		26,926,133	26,252,486
Earnings per common share (in dollars per share)	$ 2.27		$ 0.61		$ 3.13	$ 0.68

OPERATING SEGMENT DATA - Revenu

OPERATING SEGMENT DATA - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Revenues	$ 948,973	$ 627,370	$ 1,778,186	$ 1,328,769
Asset Based
Revenues
Revenues	630,145	439,585	1,159,869	935,313
ArcBest
Revenues
Revenues	268,038	149,683	518,279	312,631
FleetNet
Revenues
Revenues	49,951	37,245	98,385	78,989
Operating Segments | Asset Based
Revenues
Revenues	652,832	460,070	1,209,124	975,783
Operating Segments | ArcBest
Revenues
Revenues	270,748	151,467	523,084	316,242
Operating Segments | FleetNet
Revenues
Revenues	59,547	46,440	118,710	98,879
Other and eliminations
Revenues
Revenues	$ (34,154)	$ (30,607)	$ (72,732)	$ (62,135)

OPERATING SEGMENT DATA - Operat

OPERATING SEGMENT DATA - Operating expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
OPERATING EXPENSES
Salaries, wages, and benefits	$ 389,146	$ 305,220	$ 748,541	$ 650,166
Fuel, supplies, and expenses	80,020	54,838	153,169	126,611
Depreciation and amortization	30,282	29,086	60,636	58,099
Gain on sale of subsidiaries			(6,923)
Other	27,466	29,887	52,252	60,707
Total consolidated operating expenses	874,674	606,945	1,671,696	1,300,525
Operating Segments | Asset Based
OPERATING EXPENSES
Salaries, wages, and benefits	302,370	248,995	588,064	532,833
Fuel, supplies, and expenses	64,689	45,675	125,530	106,900
Operating taxes and licenses	12,303	11,629	24,551	24,423
Insurance	9,454	8,247	18,393	16,071
Communications and utilities	4,663	4,342	9,633	9,053
Depreciation and amortization	23,308	23,327	46,792	46,597
Rents and purchased transportation	95,082	46,152	170,670	101,922
Shared services	69,372	45,605	125,238	94,490
Gain on sale of property and equipment	71	(1,175)	(8,624)	(3,339)
Innovative technology costs	7,532	4,789	14,400	9,322
Other	77	1,448	511	3,235
Total consolidated operating expenses	588,921	439,034	1,115,158	941,507
Operating Segments | Asset Based | Land and structures (service centers)
OPERATING EXPENSES
Gain on sale of property and equipment			(8,600)
Operating Segments | ArcBest
OPERATING EXPENSES
Purchased transportation	226,603	125,090	437,598	262,272
Supplies and expenses	2,476	1,989	5,044	4,269
Depreciation and amortization	2,366	2,449	4,752	4,919
Shared services	29,078	18,840	55,150	40,567
Gain on sale of subsidiaries	(6,923)		(6,923)
Other	2,021	1,796	4,071	4,321
Total consolidated operating expenses	255,621	150,164	499,692	316,348
Operating Segments | ArcBest | Land and structures (service centers)
OPERATING EXPENSES
Gain on sale of subsidiaries	(6,900)		(6,900)
Operating Segments | FleetNet
OPERATING EXPENSES
Total consolidated operating expenses	58,409	45,658	116,549	97,057
Other and eliminations
OPERATING EXPENSES
Total consolidated operating expenses	$ (28,277)	$ (27,911)	$ (59,703)	$ (54,387)

OPERATING SEGMENT DATA - Income

OPERATING SEGMENT DATA - Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
OPERATING INCOME
Operating income	$ 74,299	$ 20,425	$ 106,490	$ 28,244
OTHER INCOME (COSTS)
Interest and dividend income	322	991	714	2,366
Interest and other related financing costs	(2,274)	(3,378)	(4,702)	(6,325)
Other, net	1,111	2,696	2,303	(1,166)
TOTAL OTHER INCOME (COSTS)	(841)	309	(1,685)	(5,125)
INCOME BEFORE INCOME TAXES	73,458	20,734	104,805	23,119
Operating Segments | Asset Based
OPERATING INCOME
Operating income	63,911	21,036	93,966	34,276
Operating Segments | ArcBest
OPERATING INCOME
Operating income	15,127	1,303	23,392	(106)
Operating Segments | FleetNet
OPERATING INCOME
Operating income	1,138	782	2,161	1,822
Other and eliminations
OPERATING INCOME
Operating income	$ (5,877)	$ (2,696)	$ (13,029)	$ (7,748)

OPERATING SEGMENT DATA - Reve_2

OPERATING SEGMENT DATA - Revenue from customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Revenues	$ 948,973	$ 627,370	$ 1,778,186	$ 1,328,769
Asset Based
Revenues
Revenues	630,145	439,585	1,159,869	935,313
ArcBest
Revenues
Revenues	268,038	149,683	518,279	312,631
FleetNet
Revenues
Revenues	49,951	37,245	98,385	78,989
Other
Revenues
Revenues	839	857	1,653	1,836
Operating Segments | Asset Based
Revenues
Revenues	652,832	460,070	1,209,124	975,783
Operating Segments | ArcBest
Revenues
Revenues	270,748	151,467	523,084	316,242
Operating Segments | FleetNet
Revenues
Revenues	59,547	46,440	118,710	98,879
Intersegment revenues | Asset Based
Revenues
Revenues	(22,687)	(20,485)	(49,255)	(40,470)
Intersegment revenues | ArcBest
Revenues
Revenues	(2,710)	(1,784)	(4,805)	(3,611)
Intersegment revenues | FleetNet
Revenues
Revenues	(9,596)	(9,195)	(20,325)	(19,890)
Intersegment revenues | Other
Revenues
Revenues	(34,993)	(31,464)	(74,385)	(63,971)
Other and eliminations
Revenues
Revenues	$ (34,154)	$ (30,607)	$ (72,732)	$ (62,135)

OPERATING SEGMENT DATA - Oper_2

OPERATING SEGMENT DATA - Operating Expenses by Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
OPERATING EXPENSES
Salaries, wages, and benefits	$ 389,146	$ 305,220	$ 748,541	$ 650,166
Rents, purchased transportation, and other costs of services	347,760	187,914	657,098	404,942
Fuel, supplies, and expenses	80,020	54,838	153,169	126,611
Depreciation and amortization	30,282	29,086	60,636	58,099
Other	27,466	29,887	52,252	60,707
Total consolidated operating expenses	$ 874,674	$ 606,945	$ 1,671,696	$ 1,300,525