Investments (Major Categories of Investment Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Gain (Loss) on Investments [Line Items]
Net realized investment gains	$ 1,030	$ 865	$ 1,057	$ 1,071
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	102	55	127	128
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	928	734	928	734
Trading Securities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	0	0	0	2
Other, Principally Real Estate [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	0	76	2	207
Other-than-Temporary Impairment [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains	$ 0	$ 0	$ 0	$ 0