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Leases (Schedule Of Supplemental Cash Flow Related To Leases) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Leases [Abstract] |  |  |
Cash paid for operating lease liabilities |  | $ 316,249 | $ 295,113
Operating lease assets obtained in exchange for operating lease liabilities | [1] | 484,888 | 2,702,778
Derecognition of operating lease assets due to terminations or impairment |  | $ 20,242 | $ 17,740
[1] | Amounts for the year ended December 31, 2019, include the transition adjustment for the adoption of Topic 842 discussed in Note 1. “Description of Business and Summary of Significant Accounting Policies” on Annual Report on Form 10-K for the year ended December 31, 2019.

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- Definition Operating lease assets obtained in exchange for operating lease liabilities. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121593497&loc=SL77918431-209957 + Details
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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=121603541&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=121609121&loc=SL77918686-209980 + Details
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