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Summary of Significant Accounting Policies - Supplemental Cash Flows (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Accounting Policies [Abstract] |  |
Operating cash flows used in operating leases | $ 266,619 | $ 252,277
Operating cash flows used in financing leases (interest) | 14,664 | 15,972
Financing cash flows used in financing leases | 36,008 | 44,808
Operating lease modifications and reassessments | 89,727 | 42,418
New operating leases (including acquisitions) | $ 173,635 | $ 117,193

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- Definition Amount of interest paid on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 + Details
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