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Fair Value of Financial Instruments Transfers between Levels (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 547 505  
Purchases 131 42 $ 505
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Balance at end of period $ 678 547 $ 505
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 $ 19,961 $ 19,097