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Long-Term Debt - Additional Information (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Oct. 04, 2017
USD ($)
Oct. 02, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
May 04, 2018
USD ($)
Jan. 17, 2018
USD ($)
Oct. 01, 2017
USD ($)
Debt Instrument [Line Items]                
Long-term debt outstanding balance     $ 445,890 $ 475,750        
Number of vessels     36          
Repayment amount       13,016        
Liability associated with vessel held for sale, part of the Tranche A     14,781        
Interest expense     $ 25,429 $ 24,782 $ 22,674      
Weighted average interest rate     5.35% 4.29%        
Repayment of credit facility     $ 73,818 $ 129,262 $ 17,354      
2011 Credit Facility - Prepaid in full                
Debt Instrument [Line Items]                
Long-term debt outstanding balance               $ 14,000
Repayment of credit facility   $ 14,000            
Tranche A | Amendment of 2017 Credit Facility repayment schedule                
Debt Instrument [Line Items]                
Repayment amount     4,554          
Balloon payment, payable together with the final quarterly instalment     134,758          
Tranche B | Amendment of 2017 Credit Facility repayment schedule                
Debt Instrument [Line Items]                
Repayment amount     8,079          
2017 Credit Facility                
Debt Instrument [Line Items]                
Repayment amount     52,275          
2015 Credit Facility                
Debt Instrument [Line Items]                
Repayment amount     328          
Aristaios Credit Facility                
Debt Instrument [Line Items]                
Long-term debt outstanding balance     27,417          
Repayment amount     $ 916          
Credit facility margin     2.85%          
New senior secured term loan 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        
Latest date the outstanding repayments will be repaid       Oct. 04, 2023        
Debt variable rate basis       LIBOR        
Credit facility margin       3.25%        
New senior secured term loan facility | Tranche A                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity       $ 259,000        
Number of vessels       11        
Repayment installments       24        
Frequency of Payments       quarterly        
Repayment amount       $ 4,833        
Balloon payment, payable together with the final quarterly instalment       $ 143,008        
Starting period of payment installments       Jan. 04, 2018        
New senior secured term loan facility | Tranche B                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity       $ 201,000        
Number of vessels       24        
Repayment installments       24        
Frequency of Payments       quarterly        
Repayment amount       $ 8,375        
Starting period of payment installments       Jan. 04, 2018        
New senior secured term loan facility | Refinances 2007 credit facility, 2008 credit facility and 2013 credit facility                
Debt Instrument [Line Items]                
Refinancing of debt, amount $ 460,000              
Repayment of credit facility $ 102,246              
In connection with the sale of M/T Aristotelis | 2017 Credit Facility                
Debt Instrument [Line Items]                
Repayment of credit facility     $ 14,383          
M/T Anikitos | ING Bank N.V.                
Debt Instrument [Line Items]                
Long-term debt outstanding balance           $ 15,625    
Line of credit facility, arrangement date     Nov. 19, 2015          
Repayment installments     13          
Frequency of Payments     quarterly          
Repayment amount     $ 355          
Balloon payment, payable together with the final quarterly instalment     $ 11,010          
Starting period of payment installments     May 31, 2020          
Debt variable rate basis     LIBOR          
Credit facility margin     2.50%          
Maturity date     Jun. 30, 2023          
M/T Aristaios | Credit Agricole Corporate & Investment Bank and ING Bank NV                
Debt Instrument [Line Items]                
Long-term debt outstanding balance             $ 28,333  
Line of credit facility, arrangement date     Jan. 02, 2017          
Repayment installments     12          
Frequency of Payments     semi-annual          
Repayment amount     $ 916          
Balloon payment, payable together with the final quarterly instalment     $ 17,333          
Starting period of payment installments     Jul. 31, 2018          
Debt variable rate basis     LIBOR          
Credit facility margin     2.85%          
Maturity date     Jan. 31, 2024          
In connection with the sale of M/T Amore Mio II | 2017 Credit Facility                
Debt Instrument [Line Items]                
Repayment of credit facility     $ 5,916