Accumulated Other Comprehensive Income (Amounts reclassified out of AOCI) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gains	$ 3,297	$ 1,703	$ 4,354	$ 2,774
Tax (expense) or benefit	(1,524)	730	(1,102)	4,882
Net income (loss)	3,339	(627)	3,895	(7,402)	(6,671)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gains			4,354
Total before tax			4,354
Tax (expense) or benefit			(1,480)
Net income (loss)			$ 2,874