Investments (Net Unrealized Investment Gains and Losses on Fixed Maturity Securities on which an OTTI loss) (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Accumulated Net Unrealized Investment Gain (Loss) Pre Tax [Member] Securities Related to Other Than Temporary Impairments [Member]	Sep. 30, 2012 Deferred Costs Policy Acquisition And Sales Inducements And Valuation Of Business Acquired, Pre Tax [Member] Securities Related to Other Than Temporary Impairments [Member]	Sep. 30, 2012 Deferred Income Tax Liability Benefit [Member] Securities Related to Other Than Temporary Impairments [Member]	Sep. 30, 2012 Accumulated Net Unrealized Investment Gain (Loss) [Member] Securities Related to Other Than Temporary Impairments [Member]
Balance	$ 166,260	$ 160,712	$ (1,740)	$ 691	$ 367	$ (682)
Net investment gains (losses) on investments arising during the period			2,399	0	(840)	1,559
Reclassification adjustment for (gains) losses included in net income			(1)	0	0	(1)
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs			0	(949)	332	(617)
Balance	$ 166,260	$ 160,712	$ 658	$ (258)	$ (141)	$ 259