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Convertible Senior Notes - Long-term Debt Instruments (Details) - USD ($) $ in Thousands	1 Months Ended			9 Months Ended
	Aug. 31, 2020	Apr. 30, 2019	Apr. 30, 2018	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Net proceeds				$ 0	$ 984,096
2026 Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 1,000,000
Less initial purchasers’ discount	(15,000)
Less other issuance costs	(904)
Net proceeds	$ 984,096
2025 Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount		$ 800,000
Less initial purchasers’ discount		(18,998)
Less other issuance costs		(822)
Net proceeds		$ 780,180
2023 Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount			$ 345,000
Less initial purchasers’ discount			(8,625)
Less other issuance costs			(757)
Net proceeds			$ 335,618

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 14
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