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Investments Level 3 and Other (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Transfers between Levels      
Transfers from Level 1 to Level 2 $ 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 680 680 678
Purchases 133   2
Sales (297)    
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Balance at end of period $ 516 680 $ 680
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 $ 32,760 $ 31,838