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Investments Level 3 and Other (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Transfers between Levels      
Transfers from Level 1 to Level 2 $ 0 $ 0  
Transfers from Level 2 to Level 1 0 0  
Changes in the Company's Level 3 fair value securities      
Balance at beginning of period 516 680  
Purchases 1,170    
Sales   (297)  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Balance at end of period 1,686 $ 383  
Alternative investments fair value $ 32,806    
Period of advance notice before quarter end 45 days    
Accounting Standards Update 2015-07      
Changes in the Company's Level 3 fair value securities      
Alternative investments fair value $ 32,806   $ 32,760