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Senior Notes (Narrative) (Details) - Senior Notes [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
4.868% Senior notes due 6/1/2044 [Member] |  |
Debt Instrument [Line Items] |  |
Date issued | Jun. 05, 2014 |
Debt instrument face amount | $ 400,000 |
Debt instrument, term | 30 years |
Debt instrument, stated interest rate | 4.868% |
Debt instrument, maturity date | Jun. 01, 2044 | Jun. 01, 2044
3.5% Senior notes due 10/15/2050 [Member] |  |
Debt Instrument [Line Items] |  |
Date issued | Oct. 07, 2020 |
Debt instrument face amount | $ 1,000,000 |
Debt instrument, term | 30 years |
Debt instrument, stated interest rate | 3.50% |
Debt instrument, maturity date | Oct. 15, 2050 | Oct. 15, 2050

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- Definition Date the debt instrument was issued, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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