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Consolidated Statements Of Cash Flows (Parenthetical)	9 Months Ended
	Sep. 30, 2020
Capital Notes 3.25% Due 6/30/2025 [Member]
Capital notes, interest rate	3.25%
Capital notes, maturity date	Jun. 30, 2025
Capital Notes 4% Due 1/24/2022 [Member]
Capital notes, interest rate	4.00%
Capital notes, maturity date	Jan. 24, 2022

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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)(1))
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X

- 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))
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
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