Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis and Realized and Unrealized Gains (Losses) (Details)

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Fair Value Measurements - Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis and Realized and Unrealized Gains (Losses) (Details) - Level 3 - Preference Shares - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Net Realized and Unrealized (Gains) Losses Included in Income   $ (2,486) $ 635
Recurring Basis      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Fair Value Beginning of Period $ 2,530 2,530  
Net Realized and Unrealized (Gains) Losses Included in Income (2,486) (2,486)  
Other Comprehensive (Income) Loss (42) (42)  
Purchases, Sales, Issuances and Settlements, Net $ (2) $ (2)