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LOANS, 2007 and 2014 Notes (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Oct. 05, 2016
Issuance of notes [Abstract] |  |
Principal amount |  | $ 8,000,000
Percentage of cash flows discounted at an effective rate | 10.126% |
2014 EMTN Program [Member] | Top of Range [Member] |  |
Issuance of notes [Abstract] |  |
Maximum principal amount | $ 400,000,000 |
2014 Note [Member] |  |
Issuance of notes [Abstract] |  |
Principal amount | $ 255,451,506 |
Interest rate | 9.625% |
Frequency of interest payment | Semiannual, payable el May 14 and November 14 of each year |
Guarantor | None |
2014 Note [Member] | May 14, 2014 [Member] |  |
Issuance of notes [Abstract] |  |
Percentage of original principal amount | 25.00% |
2014 Note [Member] | May 14, 2018 [Member] |  |
Issuance of notes [Abstract] |  |
Percentage of original principal amount | 25.00% |
2014 Note [Member] | May 14, 2019 [Member] |  |
Issuance of notes [Abstract] |  |
Percentage of original principal amount | 25.00% |
2014 Note [Member] | May 14, 2020 [Member] |  |
Issuance of notes [Abstract] |  |
Percentage of original principal amount | 25.00% |
2007 Note [Member] |  |
Issuance of notes [Abstract] |  |
Percentage of notes accepted | 67.00% |

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