Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Share Repurchases) (Details)

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Summary of Significant Accounting Policies (Share Repurchases) (Details) - Convertible Notes - 2036 Senior Convertible Notes Repurchases - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Equity, Class of Treasury Stock [Line Items]    
Principal amount of debt repurchased $ 5,000 $ 30,008
Convertible Notes Repurchases 18,086 75,890
January 2019 Program    
Equity, Class of Treasury Stock [Line Items]    
Convertible Notes Repurchases 10,000 67,804
February 2020 Program    
Equity, Class of Treasury Stock [Line Items]    
Convertible Notes Repurchases $ 8,086 $ 8,086