Long-Term Debt - Summary (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 349,138	$ 310,000
Current portion of long-term debt	7,000	7,000
Total long-term debt, less current portion	342,138	303,000
Less debt issuance costs - term loans	1,814	2,113
Total long-term debt, net of debt issuance costs - term loans	$ 340,324	$ 300,887
Weighted-average interest rate (percent)	3.72%	6.87%
Term loans
Debt Instrument [Line Items]
Long-term debt	$ 299,138	$ 310,000
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	50,000	0
Less debt issuance costs - term loans	$ 1,610	$ 1,894

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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