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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