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Investments Other (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
item
Mar. 31, 2019
USD ($)
item
Dec. 31, 2019
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings      
Other-than-temporary impairments recognized under ASC 320   $ 220  
Available-for-sale investments $ 1,165,455   $ 1,228,040
Short-term Investments $ 0   $ 0
Level 3 Securities Held Number | item 1 1  
Subprime mortgage debt securities      
Other-Than-Temporary Impairments      
Securities held $ 0