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Long-Term Debt Interest Rates (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Nov. 25, 2019	Dec. 18, 2014	Dec. 08, 2014	Nov. 24, 2014
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ (20,332)	$ (24,136)
1.125% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	0.01125%	0.01125%	1.125%
1.625% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	0.01625%	0.01625%	1.625%
1.875% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	0.01875%	0.01875%		1.875%	1.875%
3.45% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	0.0345%	0.0345%	3.45%
4.15% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	0.0415%	0.0415%				4.15%
4.50% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	4.50%
5.45% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	0.0545%	0.0545%				5.45%

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))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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+ References

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

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