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OTHER FINANCIAL AND NON-OPERATING ITEMS (Narrative) (Details) - USD ($) | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2016 | Feb. 13, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Notes Compensation Received on Termination of Charters, Face Value |  |  |  |  |  | $ 8,900,000
Compensation Received on Termination of Charters, Notes Receivable | $ 4,400,000 |  |  | $ 3,400,000 |  |
Gain (loss) from foreign currency translation |  | $ 100,000 | $ 100,000 | (2,000,000.0) |  |
Retained Earnings [Member] | ASU 2017-12 [Member] [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | $ 32,000.0 | $ 0 | $ 0 |  |
Front Circassia [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Term of Note, in years |  |  |  |  | 6 years |
Receivable, Interest Rate, Stated Percentage |  |  |  |  | 7.25% |
Notes Compensation Received on Termination of Charters, Face Value |  |  |  |  | $ 14,600,000 |
Compensation Received on Termination of Charters, Notes Receivable |  |  |  |  | $ 11,600,000 |

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