Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value (Details)

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Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets and Liabilities Measured at Fair Value    
Cash equivalents $ 375,615 $ 48,174
Exchangeable senior debentures 621,000  
Level 1    
Assets and Liabilities Measured at Fair Value    
Cash equivalents 375,615 $ 48,174
Level 2    
Assets and Liabilities Measured at Fair Value    
Exchangeable senior debentures $ 621,000