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Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Interest $ 3,455 $ 3,409    
Federal income tax (2,807) 0    
Non-cash acquisition of fixed income securities, AFS 32 0    
Assets acquired under capital lease arrangements 0 278    
Cash 674   $ 534  
Restricted cash 16,258   44,176  
Total cash and restricted cash shown in the Statements of Cash Flows 16,932 14,921 $ 44,710 $ 37,405
AFS Fixed Maturity Securities [Member]        
Exchange of fixed income securities, AFS $ 11,315 $ 1,029