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VARIABLE INTEREST ENTITIES (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
mv BULK CAJUN    
Variable Interest Entity [Line Items]    
Carrying amount, assets $ 59,400 $ 50,400
Carrying amount, liabilities 65,400 47,700
Carrying amount stockholders equity 6,000 2,700
Nordic Bulk Holding    
Variable Interest Entity [Line Items]    
Carrying amount, assets 27,200 22,600
Carrying amount, liabilities 22,100 21,300
Carrying amount stockholders equity 5,100 1,300
Long Wharf    
Variable Interest Entity [Line Items]    
Carrying amount, assets 2,100 2,200
Carrying amount, liabilities 2,300 2,400
Carrying amount stockholders equity 200 200
Nordic Bulk Ventures Holding Company Ltd and ST Shipping and Transport Ltd    
Variable Interest Entity [Line Items]    
Carrying amount, assets 154,600 154,600
Carrying amount, liabilities 76,800 86,200
Carrying amount stockholders equity 7,600 4,500
Noncontrolling interest in variable interest entity 70,200 63,900
Nordic Bulk Ventures Holding Company Ltd, Bulk Nordic Five Ltd and Bulk Nordic Six Ltd    
Variable Interest Entity [Line Items]    
Carrying amount, assets 40,700 42,600
Carrying amount, liabilities 35,600 38,000
Carrying amount stockholders equity 5,100 4,600
Venture Barge Corp and Flintstone Ventures Ltd    
Variable Interest Entity [Line Items]    
Carrying amount, assets 1,600 1,400
Carrying amount, liabilities 200  
Carrying amount stockholders equity (23)  
Noncontrolling interest in variable interest entity $ 1,500 $ 1,400