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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended
Apr. 02, 2017
Mar. 10, 2015
Apr. 01, 2017
Apr. 02, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Principal amount     $ 331,441,000    
Proceeds from debt     (10,780,000) $ (875,000)  
Repayments of debt     9,900,000    
Line of Credit | Term Loan          
Debt Instrument [Line Items]          
Principal amount   $ 350,000,000 331,441,000   $ 342,221,000
Proceeds from debt   346,500,000      
Debt instrument, unamortized discount   3,500,000 $ 6,666,000   $ 7,599,000
Payment of debt issuance cost   $ 8,300,000      
Debt instrument, interest rate, effective percentage     5.97%    
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%    
Subsequent event          
Debt Instrument [Line Items]          
Repayments of debt $ 13,700,000