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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 30, 2020
FAIR VALUE MEASUREMENTS |
Summary of fair value measurements within the hierarchy | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020 | ​ | December 31, 2019 | ​
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Level 1 |  | Level 2 |  | Level 3 |
​ | ​ | (in thousands) | ​
Long-term debt | ​ | $ | — | ​ | $ | 494,712 | ​ | $ | — | ​ | $ | — | ​ | $ | 736,206 | ​ | $ | — | ​
Total | ​ | $ | — | ​ | $ | 494,712 | ​ | $ | — | ​ | $ | — | ​ | $ | 736,206 | ​ | $ | — | ​

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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