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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value of Financial Assets and Liabilities |  |
Risk premium percentage | 1.83% |
Level 1 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | $ 0 | $ 0
Level 2 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 944,447 | 873,454
Level 3 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 0 | 0
Total |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 944,447 | 873,454
Cost |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | $ 786,227 | $ 808,622

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