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Senior Credit Facility - Credit Agreement (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Dec. 30, 2017
Jun. 15, 2017
Apr. 01, 2017
Feb. 19, 2016
Mar. 31, 2018
Line of Credit Facility [Line Items]            
Unsecured Debt $ 706,300,000 $ 427,500,000   $ 612,500,000   $ 706,300,000
Debt Issuance Costs, Gross (1,700,000) (1,400,000)   (1,100,000)   (1,700,000)
Unsecured debt, net of debt issuance costs 704,600,000 426,100,000   611,400,000   704,600,000
Unsecured Debt, Current (25,000,000) (25,000,000)   (12,500,000)   (25,000,000)
Long-term Debt, Excluding Current Maturities 679,565,000 401,069,000   598,919,000   679,565,000
Letters of Credit Outstanding, Amount 42,800,000 39,600,000   39,500,000   42,800,000
Term Loan, Maximum Borrowing Capacity     $ 100,000,000   $ 200,000,000  
Senior credit facility, maximum borrowing capacity $ 500,000,000       500,000,000 500,000,000
Swingline Loan, Maximum Borrowing Capacity           $ 50,000,000
Debt instrument, basis spread on variable rate 0.625%          
Commitment fee for unused capacity 0.10%          
Debt Instrument, Interest Rate, Stated Percentage - June 2017 Term Loan 1.00%         1.00%
Compensating Balance, Amount $ 0         $ 0
Debt Instrument, Covenant Compliance all          
Base Rate            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Interest Rate at Period End 4.75%         4.75%
London Interbank Offered Rate (LIBOR)            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Interest Rate at Period End 1.88%         1.88%
Minimum            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate           0.50%
Commitment fee for unused capacity           0.075%
Maximum            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate           1.125%
Commitment fee for unused capacity           0.20%
February 2016 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Term loan, Maximum Month End Outstanding Amount $ 175,000,000 180,000,000   187,500,000   $ 175,000,000
Term Loan, Maximum Borrowing Capacity         $ 200,000,000  
Debt Instrument, Maturity Date Feb. 19, 2022          
Due in years one and two February 2016 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Frequency of Periodic Payment           10000000
Due in years three through Maturity February 2016 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Frequency of Periodic Payment           20000000
June 2017 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Term loan, Maximum Month End Outstanding Amount $ 96,250,000 97,500,000   0   $ 96,250,000
Term Loan, Maximum Borrowing Capacity     $ 100,000,000      
Debt Instrument, Maturity Date Jun. 15, 2022          
Due in years one and two June 2017 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Frequency of Periodic Payment           5000000
Due in years three through five June 2017 Term Loan [Member] [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Frequency of Periodic Payment           10000000
2016 Senior Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Maximum Month-end Outstanding Amount $ 285,000,000 $ 0   $ 425,000,000    
Number of Financial Covenants [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Covenant Description           2
Fixed Charge Coverage Ratio Minimum Requirement [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Covenant Description           2.00
Leverage Ratio Maximum Requirement [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Covenant Description           4.00