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FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Jun. 30, 2023
Fair Value Measurements |
Valuation of marketable securities | The tables below identify the estimated fair value of the Company’s marketable securities, determined by reference to quoted market prices (Level 1), as of June 30, 2023, and December 31, 2022 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2023
​ | ​ | Quoted Priced in Active Markets | ​ | Significant Other | ​ | Significant | ​ | ​ | ​
​ | ​ | for Identical Instruments | ​ | Observable Inputs | ​ | Unobservable Inputs | ​ | ​ | ​
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Marketable securities | ​ | $ | 55,912 | ​ | $ | — | ​ | $ | — | ​ | $ | 55,912
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | Quoted Prices in Active Markets | ​ | Significant Other | ​ | Significant | ​ | ​
​ | ​ | for Identical Instruments | ​ | Observable Inputs | ​ | Unobservable Inputs | ​ | ​
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Marketable securities | ​ | $ | 49,371 | ​ | $ | — | ​ | $ | — | ​ | $ | 49,371
Valuation of senior notes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2023 | ​ | December 31, 2022
​ | ​ | Carrying Amount | ​ | Estimated Fair Value | ​ | Carrying Amount | ​ | Estimated Fair Value
Senior Notes | ​ | $ | 4,073,702 | ​ | $ | 3,822,651 | ​ | $ | 4,371,653 | ​ | $ | 4,119,777

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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