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Summary of Significant Accounting Policies (ASU 2020-06) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt obligations, net | $ 2,572,174 | $ 2,569,280
Retained earnings | (2,227,213) | (2,316,972)
Additional paid-in capital | $ (3,100,015) | $ (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% 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%
ASU 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

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