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Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Interest $ 12,064 $ 11,963    
Federal income tax 4,193 27,000    
Non-cash acquisition of fixed income securities, AFS 32 0    
Assets acquired under capital lease arrangements 0 278    
Non-cash purchase of property and equipment 18 0    
Cash 4,876   $ 534  
Restricted cash 11,604   44,176  
Total cash and restricted cash shown in the Statements of Cash Flows 16,480 16,760 $ 44,710 $ 37,405
AFS Fixed Maturity Securities [Member]        
Exchange of fixed income securities, AFS $ 32,101 $ 1,029