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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 10, 2015
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Dec. 30, 2017
Debt Instrument [Line Items]          
Principal amount   $ 294,783,000   $ 294,783,000  
Line of Credit | Term Loan          
Debt Instrument [Line Items]          
Principal amount $ 350,000,000 294,783,000   294,783,000 $ 306,791,000
Proceeds from debt 346,500,000        
Debt instrument, unamortized discount 3,500,000 $ 4,558,000   $ 4,558,000 $ 5,616,000
Payment of debt issuance cost $ 8,300,000        
Debt instrument, interest rate, effective percentage   6.92%   6.92%  
Debt instrument, periodic payment   $ 900,000 $ 900,000 $ 900,000  
Required annual excess cash flow payment   200,000      
Debt instrument, payment, percentage       75.00%  
Debt principal payment   $ 10,000,000      
Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Debt instrument, variable interest floor rate       1.00%  
Debt instrument, basis spread on variable rate       4.25%  
Minimum | Line of Credit | Term Loan          
Debt Instrument [Line Items]          
Debt instrument, payment, percentage       0.00%  
Maximum | Line of Credit | Term Loan          
Debt Instrument [Line Items]          
Debt instrument, payment, percentage       75.00%