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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 10, 2015
Jul. 01, 2017
Apr. 01, 2017
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Debt Instrument [Line Items]            
Principal amount       $ 308,542,000    
Proceeds from debt       (33,679,000) $ (4,279,000)  
Repayments of debt   $ 8,300,000 $ 9,900,000      
Required annual excess cash flow payment   $ 13,700,000        
Line of Credit | Term Loan            
Debt Instrument [Line Items]            
Principal amount $ 350,000,000     308,542,000   $ 342,221,000
Proceeds from debt 346,500,000          
Debt instrument, unamortized discount 3,500,000     $ 5,918,000   $ 7,599,000
Payment of debt issuance cost $ 8,300,000          
Debt instrument, interest rate, effective percentage       6.15%    
Debt instrument, periodic payment       $ 900,000    
Debt instrument, payment, percentage       75.00%    
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%