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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Jan. 01, 2021	Dec. 31, 2020	Sep. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt obligations, net	[1]	$ 3,282,598		$ 3,286,975
Retained earnings	[1]	(2,225,552)		(2,316,972)
Additional paid-in capital	[1]	$ (3,127,401)		(3,240,535)
3.125% Senior Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stated interest rate		3.125%			3.125%
3.125% Senior Convertible Notes | Unsecured notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt obligations, net				$ 275,100
Stated interest rate		3.125%	3.125%	3.125%	3.125%
Accounting Standards Update 2020-06 | Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt obligations, net			$ 10,000
Retained earnings			15,900
Additional paid-in capital			$ 25,900
Accounting Standards Update 2020-06 | Period of Adoption, Adjustment | 3.125% Senior Convertible Notes | Unsecured notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stated interest rate			3.125%
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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