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Investments Other (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
item
Sep. 30, 2020
USD ($)
item
Sep. 30, 2019
USD ($)
item
Dec. 31, 2019
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings        
Other-than-temporary impairments recognized under ASC 320 $ 123   $ 397  
Available-for-sale investments   $ 1,225,157   $ 1,228,040
Short-term Investments   $ 0   $ 0
Level 3 Securities Held Number | item 1 1 1  
Subprime mortgage debt securities        
Other-Than-Temporary Impairments        
Securities held   $ 0