Accumulated Other Comprehensive Income (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
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income and (Loss), Pre-Tax Amount, Beginning of period			$ 4,254
Change in net unrealized gain (loss) on investments, Pre-Tax Amount	(4,745)	966	(4,376)	1,600
Reclassification adjustment for net realized investment (gains) losses			161
Accumulated Other Comprehensive Income and (Loss), Pre-Tax Amount, End of period	39		39
Accumulated Other Comprehensive Income (Loss), Tax (Expense) Benefit, Beginning of period			(1,641)
Change in net unrealized gain (loss) on investments, Tax (Expense) Benefit			1,688
Reclassification adjustment for realized losses, Tax (Expense) Benefit			(62)
Accumulated Other Comprehensive Income (Loss), Tax (Expense) Benefit, End of period	(15)		(15)
Accumulated Other Comprehensive Income (Loss), Net-of-Tax Amount, Beginning of period			2,613
Change in net unrealized gain (loss) on investments, Net-of-Tax Amount			(2,688)
Reclassification adjustment for realized losses, Net-of-Tax Amount			99
Accumulated Other Comprehensive Income (Loss), Net-of-Tax Amount, End of period	$ 24		$ 24