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Fair Value Measurements (Carrying value and fair value of debt by hierarchy level) (Details) - Secured debt [Member] - Senior Secured Credit Facility [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 30, 2018
Fair value, inputs, level 2 [Member] | Term loan A facility [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans payable, fair value disclosure $ 462,500 $ 464,906
Fair value, inputs, level 2 [Member] | Revolving credit facility [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans payable, fair value disclosure 683,726 590,508
Reported value measurement [Member] | Term loan A facility [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, fair value 462,500 475,000
Reported value measurement [Member] | Revolving credit facility [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, fair value $ 686,300 $ 599,500