Investments (Balance of and Changes in AOCI Components) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012		Dec. 31, 2011
Accumulated other comprehensive income	$ 138,170,000				$ 147,287,000
AccumulatedTranslationAdjustmentMember
Accumulated other comprehensive income	(3,000)		2,000		7,000		0
Change in Other Comprehensive Income	(15,000)		2,000	[1]
Amount Reclassified from AOCI	0
Income Tax Benefit Expense	5,000
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive income	138,173,000	[2]	147,148,000	[2]	147,280,000	[2]	160,712,000	[2]
Change in Other Comprehensive Income	(11,298,000)	[2]	(13,564,000)	[1],[2]
Amount Reclassified from AOCI	(2,713,000)	[2],[3],[4],[5]
Income Tax Benefit Expense	4,904,000	[2]
Cash Flow Hedge Gain Loss To AOCI	(1,000,000)		(2,000,000)		(3,000,000)		(1,000,000)
Accumulated Other Comprehensive Income (loss) [Member]
Accumulated other comprehensive income	138,170,000		147,150,000		147,287,000		160,712,000
Change in Other Comprehensive Income	(11,313,000)		(13,562,000)	[1]
Amount Reclassified from AOCI	(2,713,000)	[3],[4]
Income Tax Benefit Expense	$ 4,909,000

[1] All amounts are shown net of taxes.

[2] Includes cash flow hedges of ($1) million and ($3) million as of March 31, 2013 and December 31, 2012, respectively, and ($2) million and ($1) million as of March 31, 2012 and December 31, 2011, respectively.

[3] All amounts are shown before tax.

[4] Positive amounts indicate gains/benefits reclassified out of AOCI. Negative amounts indicate losses/costs reclassified out of AOCI.

[5] See table below for additional information on unrealized investment gains (losses), including the impact on deferred policy acquisition and other costs, future policy benefits and policyholders’ dividends.