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Long-term Debt, net (Schedule of Long-term Debt, Net) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 01, 2018
Dec. 31, 2017
Debt instrument [Line Items]    
Financing obligations $ 19,571 $ 19,579
Capital lease obligations 2,958 2,015
Unamortized debt discount and issuance costs (3,941) (4,394)
Total 1,139,729 1,118,104
Current portion of long-term debt (25,964) (26,335)
Long-term debt, net $ 1,113,765 $ 1,091,769
Minimum [Member]    
Debt instrument [Line Items]    
Sale-leaseback transaction, imputed interest rate 7.66% 7.52%
Maximum [Member]    
Debt instrument [Line Items]    
Sale-leaseback transaction, imputed interest rate 7.82% 7.82%
Secured debt [Member] | Senior Secured Credit Facility [Member]    
Debt instrument [Line Items]    
Long-term debt, gross $ 1,121,000 $ 1,100,000
Secured debt [Member] | Term loan A facility [Member] | Senior Secured Credit Facility [Member]    
Debt instrument [Line Items]    
Long-term debt, gross $ 487,500 $ 500,000
Secured debt [Member] | Term loan A facility [Member] | Senior Secured Credit Facility [Member] | Weighted average [Member]    
Debt instrument [Line Items]    
Debt instrument, interest rate at period end [1] 3.78% 3.27%
Secured debt [Member] | Revolving credit facility [Member] | Senior Secured Credit Facility [Member]    
Debt instrument [Line Items]    
Line of credit facility, amount outstanding $ 633,500 $ 600,000
Secured debt [Member] | Revolving credit facility [Member] | Senior Secured Credit Facility [Member] | Weighted average [Member]    
Debt instrument [Line Items]    
Debt instrument, interest rate at period end [1] 3.77% 3.26%
Unsecured debt [Member] | Notes payable, other payables [Member]    
Debt instrument [Line Items]    
Other long-term debt, noncurrent $ 141 $ 904
Unsecured debt [Member] | Notes payable, other payables [Member] | Minimum [Member]    
Debt instrument [Line Items]    
Debt instrument, interest rate, stated percentage 1.03% 0.00%
Unsecured debt [Member] | Notes payable, other payables [Member] | Maximum [Member]    
Debt instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.18% 2.18%
[1] Represents the weighted-average interest rate for the respective period.