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Debt - Second Lien Facility (Details) - USD ($)
3 Months Ended
Mar. 30, 2016
Sep. 30, 2017
Second Lien Lenders | Second Lien Facility    
Debt Instrument [Line Items]    
Term loan, amount $ 60,000,000  
Minimum liquidity threshold 6,512,000  
Minimum liquidity threshold per vessel (in dollars per vessel) $ 148,000  
Second Lien Lenders | Second Lien Facility | Third and fourth quarters of 2017    
Debt Instrument [Line Items]    
Aggregate market value minimum threshold 100.00%  
Second Lien Lenders | Second Lien Facility | 2018    
Debt Instrument [Line Items]    
Aggregate market value minimum threshold 110.00%  
Second Lien Lenders | Second Lien Facility | 2019    
Debt Instrument [Line Items]    
Aggregate market value minimum threshold 120.00%  
Second Lien Lenders | Second Lien Facility | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 14.00%  
LIBOR rate floor 1.00%  
Second Lien Lenders | Second Lien Facility | Base Rate    
Debt Instrument [Line Items]    
Basis spread on variable rate 13.00%  
First Lien Lenders | First Lien Facility    
Debt Instrument [Line Items]    
Term loan, amount $ 201,468,750  
Minimum liquidity threshold 8,140,000  
Minimum liquidity threshold per vessel (in dollars per vessel) $ 185,000  
First Lien Lenders | First Lien Facility | Third and fourth quarters of 2017    
Debt Instrument [Line Items]    
Aggregate market value minimum threshold 100.00%  
First Lien Lenders | First Lien Facility | 2018    
Debt Instrument [Line Items]    
Aggregate market value minimum threshold 110.00%  
First Lien Lenders | First Lien Facility | 2019    
Debt Instrument [Line Items]    
Aggregate market value minimum threshold 120.00%  
First Lien Lenders | First Lien Facility | Revolving Credit Facility    
Debt Instrument [Line Items]    
Repayments of lines of credit $ 30,158,500 $ 5,000,000