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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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