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VESSELS, NET (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Vessel
Dec. 31, 2016
USD ($)
Vessel
Dec. 31, 2015
USD ($)
VESSELS, NET [Abstract]      
Number of vessels | Vessel 30 29  
Property, Plant and Equipment [Line Items]      
Total $ 1,889,270 $ 1,799,193  
Less Accumulated Depreciation (842,977) (741,144)  
Less Impairment Loss on Vessels (110,480) 0  
Vessels, Net $ 935,813 1,058,049  
Number of vessels delivered to the Company | Vessel 1    
Number of vessels the company has taken through periodical maintenance survey | Vessel 10    
Deposits for vessels under construction $ 0 (50,130) $ (64,000)
Number of vessels under construction delivered in 2018 | Vessel 3    
Total remaining capital commitments $ 117,000    
Impairment loss on vessels $ 110,480 0 $ 0
Number of vessels included in write down for impairment loss | Vessel 10    
Vessels [Member]      
Property, Plant and Equipment [Line Items]      
Total $ 1,769,967 1,700,040  
Drydocking [Member]      
Property, Plant and Equipment [Line Items]      
Total $ 119,303 $ 99,153