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Debt and Credit Facilities - Additional Information (Details) - USD ($)		12 Months Ended
	Jul. 01, 2014	Dec. 31, 2019	Dec. 31, 2018	Dec. 29, 2017
Debt Instrument [Line Items]
Debt issuance costs incurred		$ 500,000
Letters of credit outstanding amount		197,300,000	$ 223,000,000
Amortization of debt issuance costs		973,000	721,000	$ 504,000
Term Loan
Debt Instrument [Line Items]
Repayment of outstanding balance		150,000,000
Accrued Expenses and Other Current Liabilities
Debt Instrument [Line Items]
Interest payable		5,700,000	5,700,000
Senior Notes
Debt Instrument [Line Items]
Interest expense		12,400,000	12,400,000	12,400,000
Interest payments		12,400,000	$ 12,400,000	$ 12,400,000
Private Placement
Debt Instrument [Line Items]
Debt issuance costs incurred		$ 1,100,000
Repayment of outstanding balance	$ 250,000,000
Credit Agreement
Debt Instrument [Line Items]
Amended and restated credit agreement date		Nov. 30, 2017
Debt issuance costs incurred		$ 2,000,000
Revolving credit facility		500,000,000
Increase in revolving credit facility		$ 550,000,000
Credit agreement extended date		Nov. 30, 2022
Interest rate		3.02%	4.253%
Letters of credit outstanding amount		$ 43,700,000	$ 49,800,000
Credit Agreement | Base Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate		0.125%
Credit Agreement | Base Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate		1.00%
Credit Agreement | LIBOR | Minimum
Debt Instrument [Line Items]
Margin interest rate		1.125%
Credit Agreement | LIBOR | Maximum
Debt Instrument [Line Items]
Margin interest rate		2.00%

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Contractual interest rate for funds borrowed, under the debt agreement.

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