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Leases - Supplemental balance sheet information (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Dec. 31, 2019
--- | --- | ---
Operating Leases |  |
Right of use operating lease assets | $ 303,050 | $ 323,003
Finance Leases |  |
Property, plant and equipment, gross | 48,347 | 35,271
Accumulated depreciation | (10,203) | (5,664)
Property, plant and equipment, net | 38,144 | 29,607
Total lease assets | 341,194 | 352,610
Operating Leases |  |
Other current | 97,778 | 101,945
Non-current | 214,654 | 228,155
Total operating liabilities | 312,432 | 330,100
Finance Leases |  |
Short-term debt | 7,033 | 4,835
Long-term debt | 31,747 | 25,214
Total finance liabilities | 38,780 | 30,049
Total lease liabilities | $ 351,212 | $ 360,149
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PropertyPlantAndEquipmentNet |

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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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