Leases - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 31, 2019
Finance Leases
2020 (excluding the three months ended June 27, 2020)	$ 3,164
2021	5,984
2022	5,641
2023	4,951
2024	3,548
Thereafter	12,184
Total lease payments	35,472
Less imputed interest	2,694
Present value, Total	32,778	$ 30,049
Operating Leases
2020 (excluding the three months ended June 27, 2020)	73,856
2021	103,633
2022	76,115
2023	46,717
2024	28,461
Thereafter	44,124
Total lease payments	372,906
Less imputed interest	28,055
Present value, Total	344,851	$ 330,100
Total
2020 (excluding the three months ended June 27, 2020)	77,020
2021	109,617
2022	81,756
2023	51,668
2024	32,009
Thereafter	56,308
Total lease payments	$ 408,378

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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-Publisher FASB
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-Section 45
-Paragraph 1
-Subparagraph (b)
-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 next 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 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 second 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
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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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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