v3.20.1
Investments and Fair Value Measurement - Allowance for Credit Losses (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]  
Beginning balance $ 0
Credit losses on securities for which credit losses were not previously recorded (173,000)
Ending balance (173,000)
Cumulative Effect, Period of Adoption, Adjustment  
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]  
Beginning balance $ 0