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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Jun. 30, 2019
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS |
Schedule components of cash and cash equivalents, short term investments, and restricted funds | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30 |  | December 31 |
​ | ​ | 2019 | ​ | 2018 | ​
​ | ​ | (in thousands) | ​
Cash and cash equivalents | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash deposits(1) | ​ | $ | 145,629 | ​ | $ | 124,938 | ​
Variable rate demand notes(1)(2) | ​ |  | 14,536 | ​ |  | 19,786 | ​
Money market funds(3) | ​ |  | 21,566 | ​ |  | 42,470 | ​
U.S. Treasury securities(4) | ​ | ​ | — | ​ | ​ | 2,992 | ​
Total cash and cash equivalents | ​ | $ | 181,731 | ​ | $ | 190,186 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit(1) | ​ | $ | 81,685 | ​ | $ | 82,949 | ​
U.S. Treasury securities(4) | ​ | ​ | 35,972 | ​ | ​ | 23,857 | ​
Total short-term investments | ​ | $ | 117,657 | ​ | $ | 106,806 | ​
​
(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 with a maturity date within 90 days of the purchase date are classified as cash equivalents. 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 | ​
​ |  | 2019 |  | 2018 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | Carrying |  | ​ | Fair |  | ​ | Carrying |  | ​ | Fair | ​
​ | ​ | ​ | Value |  | ​ | Value |  | ​ | Value |  | ​ | Value | ​
Credit Facility(1) | ​ | $ | 70,000 | ​ | $ | 70,000 | ​ | $ | 70,000 | ​ | $ | 70,000 | ​
Accounts receivable securitization borrowings(2) | ​ | ​ | 40,000 | ​ | ​ | 40,000 | ​ | ​ | 40,000 | ​ | ​ | 40,000 | ​
Notes payable(3) | ​ |  | 172,054 | ​ |  | 175,456 | ​ |  | 181,409 | ​ |  | 181,560 | ​
​ | ​ | $ | 282,054 | ​ | $ | 285,456 | ​ | $ | 291,409 | ​ | $ | 291,560 | ​
​
(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) | Borrowings under the Company’s accounts receivable securitization program carry a variable interest rate based on LIBOR, plus a margin. The borrowings are considered to be priced at market for debt instruments having similar terms and collateral requirements (Level 2 of the fair value hierarchy).
(3) | 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).
Schedule of financial assets and liabilities measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2019 | ​
​ | ​ | ​ | ​ | ​ | 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) | ​ | $ | 21,566 | ​ | $ | 21,566 | ​ | $ | — | ​ | $ | — | ​
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan(2) | ​ |  | 3,004 | ​ |  | 3,004 | ​ |  | — | ​ |  | — | ​
Interest rate swaps(3) | ​ | ​ | 52 | ​ | ​ | — | ​ | ​ | 52 | ​ | ​ | — | ​
​ | ​ | $ | 24,622 | ​ | $ | 24,570 | ​ | $ | 52 | ​ | $ | — | ​
Liabilities: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate swaps(3) | ​ | $ | 548 | ​ | $ | — | ​ | $ | 548 | ​ | $ | — | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2018 | ​
​ | ​ | ​ | ​ | ​ | 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) | ​ | $ | 42,470 | ​ | $ | 42,470 | ​ | $ | — | ​ | $ | — | ​
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan(2) | ​ |  | 2,342 | ​ |  | 2,342 | ​ |  | — | ​ |  | — | ​
Interest rate swaps(3) | ​ | ​ | 801 | ​ | ​ | — | ​ | ​ | 801 | ​ | ​ | — | ​
​ | ​ | $ | 45,613 | ​ | $ | 44,812 | ​ | $ | 801 | ​ | $ | — | ​
Liabilities: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Contingent consideration(4) | ​ | $ | 4,472 | ​ | $ | — | ​ | $ | — | ​ | $ | 4,472 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
(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, 2019 and December 31, 2018 and considers the interest rate swap valuations in Level 2 of the fair value hierarchy.
(4) | Included in accrued expenses. At December 31, 2018, the fair value of the contingent consideration for an earn-out agreement related to the September 2016 acquisition of LDS represents the final accrued payment and was based on calculations performed for the earn-out period which ended August 31, 2018. In January 2019, final payment of the contingent consideration was released from an escrow account reported in other current assets in the consolidated balance sheets.

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