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Long-Term Debt - Additional Information (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Oct. 04, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Liability associated with vessel held for sale, part of the Tranche A   $ 14,781  
Interest expense   $ 17,422 $ 18,441 $ 17,203
Weighted average interest rate   5.40% 4.30%  
Repayment of credit facility   $ 55,283 $ 98,464 $ 13,219
2017 Credit Facility        
Debt Instrument [Line Items]        
Senior secured term loan facility, arrangement date     Sep. 06, 2017  
Line of credit facility, maximum borrowing capacity     $ 460,000  
Number of Tranches     2  
Repayment amount   34,984    
Latest date the outstanding repayments will be repaid     Oct. 04, 2023  
Debt variable rate basis     LIBOR  
Credit facility margin     3.25%  
2017 Credit Facility | Tranche A        
Debt Instrument [Line Items]        
Repayment installments     24  
Frequency of Payments     quarterly  
Repayment amount     $ 3,681  
Balloon payment, payable together with the final quarterly instalment     $ 108,935  
Starting period of payment installments     Jan. 04, 2018  
2017 Credit Facility | Tranche B        
Debt Instrument [Line Items]        
Repayment installments     24  
Frequency of Payments     quarterly  
Repayment amount     $ 6,380  
Starting period of payment installments     Jan. 04, 2018  
2017 Credit Facility | Continuing operations        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 350,401  
2017 Credit Facility | Discontinued operations        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     109,599  
2017 Credit Facility | In connection with the sale of M/T Aristotelis        
Debt Instrument [Line Items]        
Liability associated with vessel held for sale, part of the Tranche A     $ 14,781  
Repayment of credit facility   14,383    
2017 Credit Facility | In connection with the sale of M/T Amore Mio II        
Debt Instrument [Line Items]        
Repayment of credit facility   5,916    
Previous Credit Facilities        
Debt Instrument [Line Items]        
Repayment amount $ 9,914      
Repayment of credit facility $ 88,550      
Amendment of 2017 Credit Facility repayment schedule | Tranche A        
Debt Instrument [Line Items]        
Repayment amount   3,469    
Balloon payment, payable together with the final quarterly instalment   102,651    
Amendment of 2017 Credit Facility repayment schedule | Tranche B        
Debt Instrument [Line Items]        
Repayment amount   $ 6,154