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INVESTMENTS IN DEBT AND EQUITY SECURITIES (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2015 | Dec. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Apr. 30, 2019 | Dec. 31, 2016
Term of time charter, minimum period |  |  | 6 years |  |  |  |
Term of time charter, maximum period |  |  | 8 years |  |  |  |
Term of lease or charter | 15 years |  | 7 years |  | 15 years |  |
Amortised Cost |  | $ 76,234,000 | $ 87,802,000 |  | $ 76,234,000 |  |
Unrealised gains/(losses) |  | 10,940,000 | 27,756,000 |  | 10,940,000 |  |
Fair value |  | 87,174,000 | 115,558,000 |  | 87,174,000 |  |
Net unrealized gain |  |  | 27,323,000 | $ 15,304,000 | 12,277,000 |  |
Corporate Bond Securities [Member] |  |  |  |  |  |  |
Carrying value of listed and unlisted corporate bonds |  | 13,245,000 | 14,221,000 |  | 13,245,000 |  |
Corporate Bond Securities [Member] |  |  |  |  |  |  |
Amortised Cost |  | 12,601,000 | 13,873,000 |  | 12,601,000 |  |
Unrealised gains/(losses) |  | 644,000 | 348,000 |  | 644,000 |  |
Fair value |  | 13,245,000 | 14,221,000 |  | 13,245,000 |  |
Common Stock [Member] |  |  |  |  |  |  |
Amortised Cost |  | 63,633,000 | 73,929,000 |  | 63,633,000 |  |
Unrealised gains/(losses) |  |  | 27,408,000 |  |  |  | $ 10,296,000
Fair value |  | 73,929,000 | 101,337,000 |  | 73,929,000 |  |
Corporate Bond Securities_NorAm Drilling [Member] |  |  |  |  |  |  |
Amortised Cost |  | 4,715,000 | 4,423,000 |  | 4,715,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 9.00% |
Debt Securities, Available-for-sale, Sold at Par Value |  |  | 300,000 |  |  |  |
Gain (loss) on redemption |  |  | 0 |  |  |  |
Unrealised gains/(losses) |  | 477,000 | 477,000 |  | 477,000 |  |
Fair value |  | 5,192,000 | 4,900,000 |  | 5,192,000 |  |
Oro Negro Bond |  |  |  |  |  |  |
Amortised Cost |  | 7,886,000 | 7,886,000 |  | 7,886,000 |  |
Unrealised gains/(losses) |  | 167,000 | (168,000) |  | 167,000 |  |
Fair value |  | 8,053,000 | 7,718,000 |  | 8,053,000 |  |
ERROR in label resolution. |  |  |  |  |  |  |
Fair value |  | 60,800,000 | 88,000,000.0 |  | 60,800,000 |  |
ERROR in label resolution. |  |  |  |  |  |  |
Fair value |  | 3,900,000 | 4,200,000 |  | 3,900,000 |  |
Corporate Bond Securities_Oro Negro Super Senior [Member] |  |  |  |  |  |  |
Amortised Cost |  | 0 | 1,564,000 |  | 0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 12.00% |
Face value of bonds |  |  |  |  |  | $ 1,600,000 |
Unrealised gains/(losses) |  | 0 | 39,000 |  | 0 |  |
Fair value |  | 0 | 1,603,000 |  | 0 |  |
Common Stock, ADS [Member] |  |  |  |  |  |  |
Fair value |  | $ 9,200,000 | $ 9,200,000 |  | $ 9,200,000 |  |
Minimum [Member] |  |  |  |  |  |  |
Term of lease or charter |  | 6 years | 5 years |  |  |  |

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