Long-Term Debt - Interest Rates (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
1.125% Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 4,342	$ 5,659
Debt instrument, interest rate	1.125%	1.125%
1.625% Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 5,938	$ 5,696
Debt instrument, interest rate	1.625%	1.625%
1.875% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 1,585	$ 1,831
Debt instrument, interest rate	1.875%	1.875%
3.45% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 3,274	$ 3,533
Debt instrument, interest rate	3.45%	3.45%
4.15% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 2,275	$ 2,398
Debt instrument, interest rate	4.15%	4.15%
5.45% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 3,811	$ 3,850
Debt instrument, interest rate	5.45%	5.45%
Floating Rate Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 962	$ 1,169

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

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+ References

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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=109500613&loc=SL6031897-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ 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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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