Investments (Major Categories of Investment Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gain (Loss) on Investments [Line Items]
Net realized investment gains	$ 27	$ 206
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	23	73
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	0	0
Trading Securities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	0	2
Other, Principally Real Estate [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	4	131
Other-than-Temporary Impairment [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	$ 0	$ 0