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Leases - Lease Cost and Other Information (Details) - USD ($) $ in Thousands | 9 Months Ended |
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Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Cash Flow, Operating Activities, Lessee [Abstract] |  |  |
Cash paid for operating lease liabilities | $ 68,509 | $ 62,873 |
Right-of-use assets obtained in exchange for operating lease liabilities from new leases | 9,733 | 34,530 |
Right-of-use assets obtained in exchange for operating lease liabilities from lease modifications or reassessments | $ 23,155 | $ 48,151 |
Weighted average remaining lease term: |  |  |
Weighted average remaining lease term for operating leases | 4 years |  | 4 years 6 months
Operating Leases, Weighted Average Discount Rate, Percent [Abstract] |  |  |
Weighted average discount rate for operating leases | 2.40% |  | 2.60%

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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977 Reference 2: 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=123408670&loc=SL77918686-209980 + Details
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