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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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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.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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