Investments (Commercial Mortgage and Other Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Commercial mortgage loans	$ 366,192	$ 345,284
Commercial mortgage loans, Percentage	87.10%	86.90%
Valuation allowance	(482)	(1,256)
Total net commercial and agricultural mortgage loans by property type	419,823	396,251
Total commercial mortgage and other loans, net of valuation allowance	422,563	398,991
Total Commercial Mortgage By Propterty Type	420,305	397,507
Other Loans and Leases Receivable	2,740	2,740
Valuation Allowance - Other	0	0
Office buildings [Member]
Commercial mortgage loans	44,621	40,976
Commercial mortgage loans, Percentage	10.60%	10.30%
Retail stores [Member]
Commercial mortgage loans	72,226	72,325
Commercial mortgage loans, Percentage	17.20%	18.20%
Apartment Complexes [Member]
Commercial mortgage loans	143,057	125,045
Commercial mortgage loans, Percentage	34.00%	31.50%
Industrial Buildings [Member]
Commercial mortgage loans	87,088	88,009
Commercial mortgage loans, Percentage	20.70%	22.10%
Agricultural Properties [Member]
Commercial mortgage loans	54,113	52,223
Commercial mortgage loans, Percentage	12.90%	13.10%
Hospitality [Member]
Commercial mortgage loans	5,081	5,133
Commercial mortgage loans, Percentage	1.20%	1.30%
Other [Member]
Commercial mortgage loans	14,119	13,796
Commercial mortgage loans, Percentage	3.40%	3.50%
California [Member]
Commercial mortgage loans, Percentage	17.00%
Total Percentage [Member]
Commercial mortgage loans, Percentage	100.00%	100.00%
Uncollateralized Loans [Member]
Other Loans and Leases Receivable	$ 2,740	$ 2,740
Texas [Member]
Commercial mortgage loans, Percentage	12.00%