Summary of Investments (Net Realized Investment Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	$ 2,708	$ 4,151	$ 4,902	$ 6,060
Available-for-sale Securities [Abstract]
Proceeds from sales	10	3,161	10	5,971
Gross realized gains	0	96	0	238
Gross realized losses	56	0	56	0
Fixed Maturities [Member] | Available-for-sale [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	705	1,185	1,352	1,905
Fixed Maturities [Member] | Trading Securities, Change in Fair Value [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	648	(130)	948	430
Fixed Maturities [Member] | Trading Securities, Sales [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	285	298	520	298
Equity Securities [Member] | Available-for-sale [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	901	3,232	1,736	3,748
Equity Securities [Member] | Trading Securities, Change in Fair Value [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	169	(132)	346	(19)
Equity Securities [Member] | Trading Securities, Sales [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	0	38	0	38
Other Long-term Investments [Member]
Gain (Loss) on Investments [Line Items]
Net realized investment gains (losses)	$ 0	$ (340)	$ 0	$ (340)