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Debt - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 27, 2017
Dec. 23, 2016
Jun. 07, 2016
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 25, 2017
Jan. 31, 2014
Debt Instrument [Line Items]                    
Payment of special dividend     $ 72,000,000     $ 0 $ 0 $ 68,000,000    
Repayment of senior secured credit facility           2,000,000 $ 25,900,000 13,200,000    
Term loan                    
Debt Instrument [Line Items]                    
Net proceeds in excess of term loan           2,500,000        
Term loan | Fiscal Quarters Ending September 30, 2017 through June 30, 2019                    
Debt Instrument [Line Items]                    
Line of credit facility, periodic payment           2,062,500        
Term loan | Fiscal Quarters Ending September 30, 2019 through June 30, 2020                    
Debt Instrument [Line Items]                    
Line of credit facility, periodic payment           2,475,000        
Term loan | Fiscal Quarters Ending September 30, 2020 through June 30, 2021                    
Debt Instrument [Line Items]                    
Line of credit facility, periodic payment           3,093,750        
Term loan | Fiscal Quarters Ending September 30, 2021 through June 30, 2022                    
Debt Instrument [Line Items]                    
Line of credit facility, periodic payment           4,125,000        
2014 Senior Secured Credit Facility                    
Debt Instrument [Line Items]                    
Write off of unamortized debt discount and debt issuance costs       $ 1,700,000            
Write off of other fees associated with refinancing transaction       100,000            
Unamortized debt discount           700,000        
Unamortized debt issuance costs           $ 800,000        
2014 Senior Secured Credit Facility | Revolving credit facility                    
Debt Instrument [Line Items]                    
Amounts available under senior secured credit facility     25,000,000             $ 20,000,000
2014 Senior Secured Credit Facility | Term loan                    
Debt Instrument [Line Items]                    
Amounts available under senior secured credit facility                   105,000,000
Borrowings outstanding under senior secured credit facility     $ 64,000,000              
2014 Senior Secured Credit Facility | Second lien term loan                    
Debt Instrument [Line Items]                    
Amounts available under senior secured credit facility                   $ 40,000,000
Repayment of senior secured credit facility $ 40,000,000                  
Debt prepayment penalty         $ 400,000          
Write off of unamortized debt issuance costs         $ 500,000          
Senior Secured Credit Facility                    
Debt Instrument [Line Items]                    
Amounts available under senior secured credit facility   $ 200,000,000             $ 215,000,000.0  
Facility term   5 years                
Cost incurred related to credit facility       2,300,000       2,300,000 500,000  
Amortization period           5 years        
Senior Secured Credit Facility | Lender Fees                    
Debt Instrument [Line Items]                    
Cost incurred related to credit facility       2,100,000       2,100,000    
Senior Secured Credit Facility | Third-Party Fees                    
Debt Instrument [Line Items]                    
Cost incurred related to credit facility       $ 200,000       $ 200,000    
Senior Secured Credit Facility | LIBOR                    
Debt Instrument [Line Items]                    
Variable rate floor           0.00%        
Senior Secured Credit Facility | Minimum | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on interest rate   2.00%       1.50%        
Senior Secured Credit Facility | Minimum | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on interest rate   1.00%       0.50%        
Senior Secured Credit Facility | Maximum | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on interest rate   3.50%       2.75%        
Senior Secured Credit Facility | Maximum | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on interest rate   2.50%       2.75%        
Senior Secured Credit Facility | Revolving credit facility                    
Debt Instrument [Line Items]                    
Amounts available under senior secured credit facility           $ 50,000,000     50,000,000.0  
Revolving credit facility, unused amount           $ 49,500,000        
Senior Secured Credit Facility | Revolving credit facility | Minimum                    
Debt Instrument [Line Items]                    
Revolving credit facility, commitment fee           0.25%        
Senior Secured Credit Facility | Revolving credit facility | Maximum                    
Debt Instrument [Line Items]                    
Revolving credit facility, commitment fee           0.35%        
Senior Secured Credit Facility | Term loan                    
Debt Instrument [Line Items]                    
Amounts available under senior secured credit facility                 $ 165,000,000.0  
Credit facility, interest rate           4.80%        
Senior Secured Credit Facility | Letter of Credit                    
Debt Instrument [Line Items]                    
Amounts available under senior secured credit facility           $ 7,000,000        
Senior Secured Credit Facility | Swing Line Loan                    
Debt Instrument [Line Items]                    
Amounts available under senior secured credit facility           $ 5,000,000