Investments (Major Categories of Investment Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Gain (Loss) on Investments [Line Items]
Net realized investment gains	$ 2,790	$ 669
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	539	896
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	2,263	175
Trading Securities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	2	(39)
Other, Principally Real Estate [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	73	35
Other-than-Temporary Impairment [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	$ (87)	$ (398)