Investments (Net Unrealized Investment Gains and Losses on Fixed Maturity Securities on which an OTTI loss) (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Accumulated Net Unrealized Investment Gain (Loss) Pre Tax [Member] Securities Related to Other Than Temporary Impairments [Member]	Jun. 30, 2012 Deferred Policy Acquisition Costs and Other Costs Securities Related to Other Than Temporary Impairments [Member]	Jun. 30, 2012 Deferred Income Tax Liability Benefit [Member] Securities Related to Other Than Temporary Impairments [Member]	Jun. 30, 2012 Accumulated Net Unrealized Investment Gain (Loss) [Member] Securities Related to Other Than Temporary Impairments [Member]
Balance	$ 148,537	$ 160,712	$ (1,740)	$ 691	$ 367	$ (682)
Net investment gains (losses) on investments arising during the period			2,269	0	(794)	1,475
Reclassification adjustment for (gains) losses included in net income			(7)	0	2	(5)
Impact of net unrealized investment (gains) losses on deferred policy acquisition costs			0	(914)	320	(594)
Balance	$ 148,537	$ 160,712	$ 522	$ (223)	$ (105)	$ 194