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Leases - Finance leases (Details) - USD ($) $ in Thousands | Apr. 01, 2021 | Dec. 31, 2020
--- | --- | ---
Fixed assets: |  |
Property and equipment - gross | $ 1,519,686 | $ 1,521,906
Accumulated depreciation and amortization | (691,446) | (673,578)
Property and equipment - net | 828,240 | 848,328
Finance leases |  |
Fixed assets: |  |
Property and equipment - gross | 75,338 | 75,322
Accumulated depreciation and amortization | (56,286) | (55,547)
Property and equipment - net | $ 19,502 | $ 19,775

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- Definition Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
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