Leases - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 31, 2019
Finance Leases
2020 (excluding the nine months ended September 26, 2020)	$ 1,974
2021	7,414
2022	6,974
2023	6,273
2024	4,738
Thereafter	14,369
Total lease payments	41,742
Less imputed interest	2,962
Present value, Total	38,780	$ 30,049
Operating Leases
2020 (excluding the nine months ended September 26, 2020)	30,826
2021	106,731
2022	79,632
2023	49,986
2024	29,767
Thereafter	39,114
Total lease payments	336,056
Less imputed interest	23,624
Present value, Total	312,432	$ 330,100
Total
2020 (excluding the nine months ended September 26, 2020)	32,800
2021	114,145
2022	86,606
2023	56,259
2024	34,505
Thereafter	53,483
Total lease payments	$ 377,798

Finance Lease, Liability, to be Paid, after Year Four

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Lessee, Operating Lease, Liability, Payments, Due after Year Four

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Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in remainder of current fiscal year.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year.

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