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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2023
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Note 17 — Fair Value Measurements Our financial instruments include cash and cash equivalents, receivables, accounts payable and long-term debt. The carrying amount of cash and cash equivalents, trade and other current receivables as well as accounts payable approximates fair value due to the short-term nature of these instruments. The following table sets forth our assets and liabilities that are measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value at September 30, 2023
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Contingent consideration | ​ |  | — | ​ |  | — | ​ |  | 74,073 | ​ |  | 74,073
​ Contingent consideration liability related to the Alliance acquisition (Note 3) is measured at fair value using Level 3 unobservable inputs at the end of each reporting period. The fair value of the estimated contingent consideration is determined based on our evaluation of the probability and amount of earn-out that may be achieved based on expected future performance of Helix Alliance. The Monte Carlo simulation model is used to calculate the estimated earn-out payment, which is then discounted to present value based on the expected payment date of the contingent consideration. The changes in the fair value of contingent consideration are as follows (in thousands): ​
​ | ​ | ​ | ​
​ |  | 2023
Balance at January 1, | ​ | $ | 42,754
Change in fair value | ​ | ​ | 31,319
Balance at September 30, | ​ | $ | 74,073
​ The principal amount and estimated fair value of our long-term debt are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023 | ​ | December 31, 2022
​ | ​ | Principal | ​ | Fair | ​ | Principal | ​ | Fair
​ |  | Amount (1) |  | Value (2) |  | Amount (1) |  | Value (2)
2023 Notes (matured September 2023) | ​ | $ | — | ​ | $ | — | ​ | $ | 30,000 | ​ | $ | 31,149
2026 Notes (mature February 2026) | ​ |  | 200,000 | ​ |  | 340,000 | ​ |  | 200,000 | ​ |  | 277,014
MARAD Debt (matures February 2027) | ​ | ​ | 32,580 | ​ | ​ | 32,151 | ​ | ​ | 40,913 | ​ | ​ | 40,940
Total debt | ​ | $ | 232,580 | ​ | $ | 372,151 | ​ | $ | 270,913 | ​ | $ | 349,103
(1) | Principal amount includes current maturities and excludes any related unamortized debt issuance costs. See Note 6 for additional disclosures on our long-term debt.
(2) | The estimated fair value of the 2023 Notes, the 2026 Notes and the MARAD Debt was determined using Level 2 fair value inputs under the market approach, which was determined using a third-party evaluation of the remaining average life and outstanding principal balance of the indebtedness as compared to other obligations in the marketplace with similar terms.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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