Investments (Net Unrealized Investment Gains and Losses on Fixed Maturity Securities on which an OTTI loss) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Accumulated Net Unrealized Investment Gain (Loss) Pre Tax [Member] Securities Related to Other Than Temporary Impairments [Member]	Mar. 31, 2013 Deferred Costs Policy Acquisition And Sales Inducements And Valuation Of Business Acquired, Pre Tax [Member] Securities Related to Other Than Temporary Impairments [Member]	Mar. 31, 2013 Deferred Income Tax Liability Benefit [Member] Securities Related to Other Than Temporary Impairments [Member]	Mar. 31, 2013 Accumulated Net Unrealized Investment Gain (Loss) [Member] Securities Related to Other Than Temporary Impairments [Member]
Balance	$ 138,170	$ 147,287	$ 545	$ (214)	$ (100)	$ 231
Net investment gains (losses) on investments arising during the period			608	0	(213)	395
Reclassification adjustment for (gains) losses included in net income			(788)	0	276	(512)
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs			0	85	(30)	55
Balance	$ 138,170	$ 147,287	$ 365	$ (129)	$ (67)	$ 169