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Long-Term Debt - Domestic Line of Credit (Details) - Line of Credit - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Sep. 12, 2016
Sep. 30, 2016
Senior Secured Credit Facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   $ 100,000  
Term of debt   6 years  
Prepayment fee, first year   2.00%  
Prepayment fee, second year   1.00%  
Minimum lender debt percent to approve default events   50.00%  
Interest expense     $ 400
Effective interest rate     14.00%
Remaining unamortized issuance discount period     5 years
Initial Term Loan      
Line of Credit Facility [Line Items]      
Amount outstanding   $ 50,000  
Closing fee   1.75%  
Delayed Draw Term Loans      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   $ 50,000  
Monthly commitment fee percentage   2.75%  
Quarterly loan servicing fee   $ 15  
Commitment fee percentage   0.875%  
Minimum | Senior Secured Credit Facility      
Line of Credit Facility [Line Items]      
Call feature, percent of related debt instrument outstanding, minimum   10.00%  
LIBOR | Senior Secured Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   7.50%  
Interest rate floor   1.00%  
Reference rate | Senior Secured Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   6.50%  
Interest rate floor   3.00%  
Forecast | LIBOR | Senior Secured Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 6.50%    
Forecast | Reference rate | Senior Secured Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 5.50%