Investments Gains and Losses by Security Type (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gain (Loss)	$ (12)	$ 81
Quarter to Date [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains	42	90
Available-for-sale, Gross Realized Gains, Fair Value at Sale	12,105	737
Available-for-sale Securities, Gross Realized Losses	(54)	(9)
Available-for-sale, Gross Realized Losses, Fair Value at Sale	16,996	153
Available-for-sale Securities, Gross Realized Gain (Loss)	(12)	81
Available-for-sale, Gross Realized Gains (Losses), Fair Value at Sale	29,101	890
Fixed Maturities [Member] | Quarter to Date [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains	24	0
Available-for-sale, Gross Realized Gains, Fair Value at Sale	12,000	0
Available-for-sale Securities, Gross Realized Losses	54	0
Available-for-sale, Gross Realized Losses, Fair Value at Sale	16,996	0
Equity Securities [Member] | Quarter to Date [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains	18	90
Available-for-sale, Gross Realized Gains, Fair Value at Sale	105	737
Available-for-sale Securities, Gross Realized Losses	0	9
Available-for-sale, Gross Realized Losses, Fair Value at Sale	$ 0	$ 153