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Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Interest $ 10,986 $ 10,947
Federal income tax 29,000 8,500
Corporate actions related to equity securities, AFS [1] 3,032 884
Assets acquired under capital lease arrangements 2,999 3,478
Non-cash purchase of property and equipment 577 0
AFS Fixed Maturity Securities [Member]    
Exchange of fixed income securities, AFS 17,702 17,120
National Flood Insurance Program [Member]    
Restricted cash $ 8,900 $ 5,200
[1] 1Examples of such corporate actions include non-cash acquisitions and stock splits.