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Long-term Debt - Domestic Line of Credit (Details) - Line of Credit - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 12, 2016
Sep. 30, 2016
Senior Secured Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 100,000  
Debt instrument, term   6 years  
Stated interest rate     2.125%
Prepayment fee, next twelve months   2.00%  
Prepayment fee, year two   1.00%  
Senior Secured Credit Facility | Minimum      
Debt Instrument [Line Items]      
Call feature, percent of related debt instrument outstanding   10.00%  
Senior Secured Credit Facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate   7.50%  
Floor interest rate   1.00%  
Senior Secured Credit Facility | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate   6.50%  
Floor interest rate   3.00%  
Initial Term Loan      
Debt Instrument [Line Items]      
Fair value of amount outstanding   $ 50,000  
Delayed Draw Term Loans      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 50,000  
Commitment fee percentage   2.75%  
Quarterly loan servicing fee   $ 15  
Commitment fee percentage   0.875%  
Forecast | Senior Secured Credit Facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 6.50%    
Forecast | Senior Secured Credit Facility | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 5.50%