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Commitments and Contingencies (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
NOK (kr)
Bareboat commitments charter hire (4)    
Loss Contingencies [Line Items]    
Variable portion of payment to SWS owner 3-month LIBOR rate of 2.3199%  
Vessel upgrades (3)    
Loss Contingencies [Line Items]    
Contractual Obligation $ 106,246  
Secured financing related to commitments payments 127,321  
Vessel upgrades (3) | Loan and Bareboat Lease Agreements    
Loss Contingencies [Line Items]    
Secured financing related to commitments payments 112,321  
Vessel upgrades (3) | Finance Lease Agreements    
Loss Contingencies [Line Items]    
Secured financing related to commitments payments 15,000  
Vessel upgrades (3) | Delphin Vessels    
Loss Contingencies [Line Items]    
Contractual Obligation 18,944  
Office rent (5)    
Loss Contingencies [Line Items]    
Office rent 1,436  
Office rent (5) | Indefinite rental agreement    
Loss Contingencies [Line Items]    
Office rent $ 22  
Exchange rate NOK/USD 0.1174 0.1174
Office rent (5) | Indefinite rental agreement | NOK    
Loss Contingencies [Line Items]    
Office rent | kr   kr 188,000