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LONG-TERM DEBT (Details)
$ / shares in Units, $ in Millions
12 Months Ended
May 04, 2018
USD ($)
$ / shares
Mar. 10, 2018
USD ($)
Dec. 05, 2017
USD ($)
Dec. 31, 2017
USD ($)
Building
$ / shares
May 03, 2018
Vessel
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2012
USD ($)
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 375.0        
Maturity date       Nov. 30, 2020        
Debt instrument, frequency of periodic payment       quarterly        
Debt instrument, periodic payment       $ 10.0        
Number of new buildings | Building       3        
Percentage of purchase price expected to pay by lending provider       77.50%        
Term of bareboat charter agreement       10 years        
First flexibility period to purchase the vessels       5 years        
Second flexibility period to purchase the vessels       7 years        
Minimum value adjusted equity       $ 175.0        
Minimum value adjusted equity ratio       25.00%        
Minimum liquidity value       $ 20.0        
Subsequent Event [Member]                
Debt Instrument [Line Items]                
Number of vessels placed in the market for sale | Vessel         2      
Maximum [Member]                
Debt Instrument [Line Items]                
Interest rate       10.50%        
Amount of dividends that can be distributed quarterly (in dollars per share) | $ / shares       $ 0.03        
Maximum [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Number of additional vessels possibly expected to be sold | Vessel         10      
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity             $ 500.0 $ 430.0
Maturity date       Dec. 31, 2020        
Deferred financing costs             $ 4.6  
Drawn amount       $ 391.6   $ 447.0    
Percentage of increase in margin for the period of waiver           2.00%    
Repayment of debt     $ 3.1          
Revolving Credit Facility [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Security ratio after adjustment 135.00%              
Liquidity covenant after adjustment $ 15.0              
Minimum market cap ratio after adjustment $ 200.0              
Percentage of increase in undrawn borrowings 6.00%              
Dividend distributed $ 4.3              
Repayment of debt $ 52.3 $ 4.3            
Amount of dividends that can be distributed quarterly (in dollars per share) | $ / shares $ 0.03              
Revolving Credit Facility [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Minimum market cap to value adjusted total assets       25.00%        
Revolving Credit Facility [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Minimum market cap to value adjusted total assets       45.00%        
Revolving Credit Facility [Member] | Maximum [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Proceeds from sale of equity $ 75.0              
New Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 250.0        
Covenant amount       30.0        
New equity under recapitalization program       103.7        
Gross amount under new equity under recapitalization program       110.0        
Associated fees       13.1        
Financing of outstanding commitments per ship       39.0        
New Revolving Credit Facility [Member] | Bond Loan [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 150.0