Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Cash Operating Activities:
Operating leases	$ 43,115	$ 41,812
Finance leases	141	86
Cash paid for amounts included in the measurement of lease liabilities	43,256	41,898
Non-cash Investing Activities:
Property, equipment and intangibles purchased in accounts payable	2,844	7,657
Property, equipment and intangibles purchased for debt	13,571	29,813
Customer accounts receivable converted to notes receivable	820	538
Cash Financing Activities:
Proceeds from issuance of new debt	250,000	124,375
Borrowings on long-term debt	893	6,282
Payments of long-term debt	(24,668)	(104,954)
Payments of debt issuance and extinguishment costs, including underwriting fees	(4,583)	(635)
Change in long-term debt	221,642	25,068
Cash paid for amounts included in the measurement of finance lease liabilities	1,167	597
Non-cash Financing Activities:
Debt issuance costs deducted from long-term debt borrowings in accounts payable	250	0
Prepaid insurance funded through short-term debt borrowings	10,785	4,948
Prepaid ERP costs funded through short-term debt borrowings	0	1,430
Shares surrendered for tax obligations for employee share-based transactions in accrued liabilities	178	79
Accounts payable converted to installment notes	914	757
Other Supplemental Cash Flow Information:
Cash taxes paid, net of refunds	14,197	21,026
Cash interest paid	$ 37,457	$ 38,832