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Indebtedness and Interest Expense - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Debt Instrument [Line Items]        
Interest Expense, Other Long-term Debt $ 337 $ 341 $ 398 $ 640
Interest expense 19,979 19,113 39,787 37,671
Term Loan Facility [Member]        
Debt Instrument [Line Items]        
Interest Expense, Debt 10,577 9,681 21,243 18,800
Senior Notes [Member]        
Debt Instrument [Line Items]        
Interest Expense, Debt, Excluding Amortization 5,083 5,083 10,165 10,165
Capital Lease Obligations [Member]        
Debt Instrument [Line Items]        
InterestExpenseSaleLeaseback 2,683 2,623 5,377 5,252
Capital Leases, Income Statement, Interest Expense 376 431 757 859
Sale Leaseback Obligations [Member]        
Debt Instrument [Line Items]        
Amortization of debt issuance costs $ 923 $ 954 $ 1,847 $ 1,955
Term Loan Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate During Period       5.60%
SecuredCreditFacilitiesAndSeniorNotes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate During Period     6.80% 6.30%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | The Senior Secured Credit Facilities [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Additional Margin on Basis Spread of Variable Rate 3.25%   3.25%  
Maximum [Member] | Base Rate [Member] | Term Loan Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Additional Margin on Basis Spread of Variable Rate 2.25%   2.25%