Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Amortization of debt discount and issuance costs	$ 17,343	$ 16,709	$ 34,525	$ 33,264
Capitalization of interest expense	(883)	(1,032)	(1,808)	(1,954)
Total interest expense	18,037	17,249	35,871	34,454
Credit Agreement
Debt Instrument [Line Items]
Interest on debt instruments	140	135	280	270
Convertible Debt \| 2025 Notes
Debt Instrument [Line Items]
Interest on debt instruments	359	359	718	718
Convertible Debt \| 2027 Notes
Debt Instrument [Line Items]
Interest on debt instruments	$ 1,078	$ 1,078	$ 2,156	$ 2,156

Increase for accrued, but unpaid interest on the debt instrument for the period.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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