Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value - Schedule of Assets and Liabilities (Details)

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Assets and Liabilities Measured at Fair Value - Schedule of Assets and Liabilities (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 262,813 $ 1,368,176
Indemnification obligation 393,578 344,643
Exchangeable senior debentures 1,478,459 1,472,125
Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 262,813 1,368,176
Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Indemnification obligation 393,578 344,643
Exchangeable senior debentures $ 1,478,459 $ 1,472,125