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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
FAIR VALUE OF FINANCIAL INSTRUMENTS |
Schedule of fair values and carrying values of the Company's financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019 | ​
​ |  | Carrying |  | ​ | ​ |  | Carrying |  | ​ | ​ |
​ |  | Value |  | Fair Value |  | Value |  | Fair Value |
Cash and cash equivalents | ​ | $ | 143,872 | ​ | $ | 143,872 | ​ | $ | 155,889 | ​ | $ | 155,889 | ​
Restricted cash | ​ |  | 35,807 | ​ |  | 35,807 | ​ |  | 6,360 | ​ |  | 6,360 | ​
Principal amount of floating rate debt | ​ |  | 449,228 | ​ |  | 449,228 | ​ |  | 495,824 | ​ |  | 495,824 | ​

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