Summary of Investments (Net Realized Investment Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	$ 894	$ 1,190	$ 5,796	$ 7,250
Available-for-sale Securities [Abstract]
Proceeds from sales	3,081	17,036	3,091	23,007
Gross realized gains	900	213	900	451
Gross realized losses	0	0	(56)	0
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	0	(139)	0	(139)
Fixed Maturities [Member] | Available-for-sale [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	984	765	2,336	2,670
Fixed Maturities [Member] | Trading Securities, Change in Fair Value [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	(253)	360	695	790
Fixed Maturities [Member] | Trading Securities, Sales [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	181	310	701	608
Equity Securities [Member] | Available-for-sale [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	0	(9)	1,736	3,739
Equity Securities [Member] | Trading Securities, Change in Fair Value [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	(17)	(97)	329	(116)
Equity Securities [Member] | Trading Securities, Sales [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	(1)	0	(1)	38
Other Long-term Investments [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	$ 0	$ 0	$ 0	$ (340)