Investments (Commercial Mortgage and Other Loans) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Commercial mortgage loans	$ 356,658	$ 345,284
Commercial mortgage loans, Percentage	86.80%	86.90%
Valuation allowance	(530)	(1,256)
Total net commercial and agricultural mortgage loans by property type	410,590	396,251
Total commercial mortgage and other loans, net of valuation allowance	413,330	398,991
Total Commercial Mortgage By Propterty Type	411,120	397,507
Other Loans and Leases Receivable	2,740	2,740
Office buildings [Member]
Commercial mortgage loans	44,301	40,976
Commercial mortgage loans, Percentage	10.80%	10.30%
Retail stores [Member]
Commercial mortgage loans	71,158	72,325
Commercial mortgage loans, Percentage	17.30%	18.20%
Apartment Complexes [Member]
Commercial mortgage loans	136,875	125,045
Commercial mortgage loans, Percentage	33.30%	31.50%
Industrial Buildings [Member]
Commercial mortgage loans	85,048	88,009
Commercial mortgage loans, Percentage	20.70%	22.10%
Agricultural Properties [Member]
Commercial mortgage loans	54,462	52,223
Commercial mortgage loans, Percentage	13.20%	13.10%
Hospitality [Member]
Commercial mortgage loans	5,099	5,133
Commercial mortgage loans, Percentage	1.30%	1.30%
Other [Member]
Commercial mortgage loans	14,177	13,796
Commercial mortgage loans, Percentage	3.40%	3.50%
California [Member]
Commercial mortgage loans, Percentage	17.00%
Ohio [Member]
Commercial mortgage loans, Percentage	8.00%
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%