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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 10, 2015
Mar. 30, 2019
Dec. 29, 2018
Debt Instrument [Line Items]      
Principal amount   $ 236,158,000  
Line of Credit | Term Loan      
Debt Instrument [Line Items]      
Principal amount $ 350,000,000    
Proceeds from debt 346,500,000    
Debt instrument, unamortized discount 3,500,000 $ 2,700,000 $ 3,386,000
Payment of debt issuance cost $ 8,300,000    
Debt instrument, interest rate, effective percentage   7.42%  
Debt instrument, periodic payment   $ 900,000 900,000
Debt instrument, payment, percentage   75.00%  
Repayments of debt   $ 26,900,000  
Debt principal payment     25,000,000
Mandatory debt payment from proceeds of asset sale   1,000,000  
Debt outstanding   $ 236,158,000 $ 263,033,000
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%