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Reinsurance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Life insurance in force, Gross Amount $ 17,025,125 $ 16,504,539 $ 15,800,701
Life insurance in force, Ceded to Other Companies 4,065,449 3,625,946 3,360,016
Life insurance in force, Assumed from Other Companies 0 0 0
Life insurance in force, Net Amount $ 12,959,676 $ 12,878,593 $ 12,440,685
Life insurance in force, Percentage of Amount Assumed to Net 0.00% 0.00% 0.00%
Premiums      
Gross Amount $ 777,651 $ 752,798 $ 739,281
Ceded to Other Companies 22,826 25,077 27,276
Assumed from Other Companies 4,321 4,159 3,755
Net Amount $ 759,146 $ 731,880 $ 715,760
Percentage of Amount Assumed to Net 0.60% 0.60% 0.50%
Property and casualty [Member]      
Premiums      
Gross Amount $ 632,372 $ 610,347 $ 599,230
Ceded to Other Companies 16,179 18,548 21,157
Assumed from Other Companies 4,321 4,159 3,755
Net Amount $ 620,514 $ 595,958 $ 581,828
Percentage of Amount Assumed to Net 0.70% 0.70% 0.60%
Retirement [Member]      
Premiums      
Gross Amount $ 24,937 $ 25,378 $ 25,540
Ceded to Other Companies 0 0 0
Assumed from Other Companies 0 0 0
Net Amount $ 24,937 $ 25,378 $ 25,540
Percentage of Amount Assumed to Net 0.00% 0.00% 0.00%
Life [Member]      
Premiums      
Gross Amount $ 120,342 $ 117,073 $ 114,511
Ceded to Other Companies 6,647 6,529 6,119
Assumed from Other Companies 0 0 0
Net Amount $ 113,695 $ 110,544 $ 108,392
Percentage of Amount Assumed to Net 0.00% 0.00% 0.00%