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Long-Term Debt Senior Credit Facility (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 30, 2018
Apr. 01, 2018
Debt Instrument [Line Items]      
Permitted indebtedness $ 300,000    
Line of Credit Facility, Current Borrowing Capacity 73,000    
Line of Credit Facility, Potential Incremental Increases 25,000    
Senior Credit Facility - Revolving credit borrowings 6,250 $ 0  
Letters of Credit Outstanding, Amount 11,600    
Line of Credit Facility, Remaining Borrowing Capacity 55,100    
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 20,000    
Alternative Base Rate [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate     1.75%
Alternative Base Rate [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 1.75%    
Alternative Base Rate [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.75%    
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate 2.75%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.75%    
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.75%