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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2023
Fair Value Disclosures [Abstract] |
Schedule of financial instruments measured at fair value on a recurring basis | 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 June 30, 2023
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Contingent consideration | ​ |  | — | ​ |  | — | ​ |  | 57,574 | ​ |  | 57,574
Schedule of changes in the fair value of 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 | ​ | ​ | 14,820
Balance at June 30, | ​ | $ | 57,574
Schedule of principal amount and estimated fair value of long-term debt | The principal amount and estimated fair value of our long-term debt are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2023 | ​ | December 31, 2022
​ | ​ | Principal | ​ | Fair | ​ | Principal | ​ | Fair
​ |  | Amount (1) |  | Value (2) |  | Amount (1) |  | Value (2)
2023 Notes (mature September 2023) | ​ | $ | 30,000 | ​ | $ | 30,097 | ​ | $ | 30,000 | ​ | $ | 31,149
2026 Notes (mature February 2026) | ​ |  | 200,000 | ​ |  | 265,598 | ​ |  | 200,000 | ​ |  | 277,014
MARAD Debt (matures February 2027) | ​ | ​ | 36,797 | ​ | ​ | 36,912 | ​ | ​ | 40,913 | ​ | ​ | 40,940
Total debt | ​ | $ | 266,797 | ​ | $ | 332,607 | ​ | $ | 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 Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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