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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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