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Long-Term Debt - Additional Information (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]    
Number of vessels 36  
Line of credit facility, remaining borrowing capacity $ 0  
Interest expense $ 12,481 $ 11,055
Weighted average interest rate 4.14% 3.70%
2013 Credit Facility    
Debt Instrument [Line Items]    
Repayment amount $ 8,677  
New Facility    
Debt Instrument [Line Items]    
Senior secured term loan facility, arrangement date May 22, 2017  
Line of credit facility, maximum borrowing capacity $ 460,000  
Duration of credit facility after the drawdown 6 years  
Latest date the outstanding repayments will be repaid Nov. 30, 2023  
Number of Tranches 2  
Debt variable rate basis LIBOR  
Credit facility margin 3.25%  
New Facility | Refinances 2007 Credit Facility, 2008 Credit Facility, 2011 Credit Facility and 2013 Credit Facility    
Debt Instrument [Line Items]    
Number of credit facilities to be refinanced 4  
New Facility | Tranche A    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity $ 259,000  
Percentage of the fair value of a number of vessels for the calculation of tranche 57.50%  
Number of vessels 11  
Repayment installments 24  
Frequency of Payments quarterly  
Balloon payment, payable together with the final quarterly instalment $ 143,008  
New Facility | Tranche B    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity $ 201,000  
Percentage of the fair value of a number of vessels for the calculation of tranche 57.50%  
Number of vessels 24  
Repayment installments 24  
Frequency of Payments quarterly  
Maximum | New Facility | Tranche A    
Debt Instrument [Line Items]    
Repayment amount $ 4,833  
Maximum | New Facility | Tranche B    
Debt Instrument [Line Items]    
Repayment amount $ 8,375