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Long-Term Debt - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
USD ($)
Mar. 27, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]        
Interest expense     $ 8,426 $ 8,715
Weighted average interest rate     6.00% 5.20%
Repayment of credit facility     $ 17,326 $ 31,077
2017 Credit Facility        
Debt Instrument [Line Items]        
Repayment of credit facility     $ 17,326  
2017 Credit Facility | Transaction agreement with DSS Holdings L.P.        
Debt Instrument [Line Items]        
Repayment amount   $ 89,298    
Amended 2017 Credit Facility        
Debt Instrument [Line Items]        
Repayment installments 19      
Frequency of Payments quarterly      
Repayment amount $ 7,703      
Balloon payment, payable together with the final installment $ 139,130      
Starting period of payment installments Apr. 30, 2019      
Maturity date Dec. 31, 2023      
Credit Facility 2015, Credit Facility 2017 and Aristaios Credit Facility        
Debt Instrument [Line Items]        
Repayment amount   $ 146,517