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Long-Term Debt - Additional Information (Details)
$ in Thousands
2 Months Ended 4 Months Ended 12 Months Ended
Feb. 26, 2016
USD ($)
Feb. 23, 2016
USD ($)
Apr. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Oct. 24, 2016
USD ($)
Debt Instrument [Line Items]              
Long-term debt outstanding balance       $ 605,012 $ 571,616    
Line of credit facility, remaining borrowing capacity       0      
Interest expense       $ 22,674 $ 17,856 $ 16,480  
Weighted average interest rate       4.01% 3.65%    
2013 Credit Facility              
Debt Instrument [Line Items]              
Long-term debt outstanding balance       $ 207,646      
Repayment amount       17,354      
Line of credit facility, remaining borrowing capacity         $ 35,000    
Line of credit facility amount drawn down         $ 115,000    
2007 Credit Facility              
Debt Instrument [Line Items]              
Long-term debt outstanding balance       $ 185,975      
Frequency of Payments       quarterly      
Debt variable rate basis       LIBOR      
Prepayments of five scheduled amortization payments     $ 64,875        
Number of amortization payments     5        
Deferral of scheduled amortization payments     November 2017        
2007 Credit Facility | Extension of the final maturity date              
Debt Instrument [Line Items]              
Maturity date       Dec. 31, 2019      
2007 Credit Facility | Prior to amendment              
Debt Instrument [Line Items]              
Credit facility margin       2.00%      
2007 Credit Facility | After the amendment              
Debt Instrument [Line Items]              
Credit facility margin       3.00%      
2008 Credit Facility              
Debt Instrument [Line Items]              
Long-term debt outstanding balance       $ 181,641      
Frequency of Payments       quarterly      
Prepayments of five scheduled amortization payments     $ 46,024        
Number of amortization payments     5        
Deferral of scheduled amortization payments     November 2017        
2008 Credit Facility | Extension of the final maturity date              
Debt Instrument [Line Items]              
Maturity date       Dec. 31, 2019      
2011 Credit Facility              
Debt Instrument [Line Items]              
Long-term debt outstanding balance       $ 14,000      
Frequency of Payments       quarterly      
Prepayments of five scheduled amortization payments     $ 5,000        
Number of amortization payments     5        
Deferral of scheduled amortization payments     December 2017        
M/T Amor | ING Bank N.V.              
Debt Instrument [Line Items]              
Long-term debt outstanding balance             $ 15,750
Line of credit facility, arrangement date       Nov. 19, 2015      
Repayment installments       17      
Frequency of Payments       quarterly      
Starting period of payment installments       Oct. 24, 2018      
Maturity date       Nov. 30, 2022      
Debt variable rate basis       LIBOR      
Credit facility margin       2.50%      
M/V CMA CGM Magdalena | 2013 Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility amount drawn down $ 35,000 $ 35,000