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Long-term Debt - Domestic Line of Credit (Details) - Line of Credit - USD ($)
Dec. 31, 2017
Sep. 12, 2016
Senior Secured Credit Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity   $ 100,000,000
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   $ 50,000,000
Delayed Draw Term Loans    
Debt Instrument [Line Items]    
Maximum borrowing capacity   $ 50,000,000
Commitment fee percentage   2.75%
Quarterly loan servicing fee   $ 15,000
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%