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Debt and Credit Facilities - Additional Information (Details) - USD ($)			3 Months Ended		9 Months Ended
	May 10, 2019	Jul. 01, 2014	Sep. 30, 2019	Sep. 28, 2018	Sep. 30, 2019	Sep. 28, 2018	Jan. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt issuance costs incurred			$ 500,000		$ 500,000
Letters of credit outstanding amount			220,600,000		220,600,000			$ 223,000,000
Amortization of debt issue costs			200,000	$ 200,000	802,000	$ 548,000
Term Loan
Debt Instrument [Line Items]
Interest expense			0		2,300,000
Repayment of outstanding balance	$ 150,000,000
Debt Amount							$ 150,000,000
Accrued Expenses and Other Current Liabilities
Debt Instrument [Line Items]
Interest payable			2,600,000		2,600,000			5,700,000
Senior Notes
Debt Instrument [Line Items]
Interest expense			9,300,000	3,100,000	9,300,000	3,100,000
Interest payments			12,400,000	6,200,000	12,400,000	6,200,000
Senior Notes | Level 2
Debt Instrument [Line Items]
Estimated fair value			269,300,000		269,300,000
Private Placement
Debt Instrument [Line Items]
Debt issuance costs incurred			1,100,000		$ 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		$ 2,000,000
Revolving credit facility			500,000,000		500,000,000
Increase in revolving credit facility			550,000,000		$ 550,000,000
Credit agreement extended date					Nov. 30, 2022
Letters of credit outstanding amount			45,200,000		$ 45,200,000			$ 49,800,000
Interest expense			$ 1,100,000	$ 2,500,000	$ 6,400,000	$ 3,500,000
Credit Agreement | Minimum
Debt Instrument [Line Items]
Interest rate								4.253%
Credit Agreement | Maximum
Debt Instrument [Line Items]
Interest rate			3.35%		3.35%
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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Face (par) amount of debt instrument at time of issuance.

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

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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