Investments (Balance of and Changes in AOCI Components) (USD $)	3 Months Ended		9 Months Ended				12 Months Ended
	Sep. 30, 2013		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012		Dec. 31, 2011
Accumulated other comprehensive income	$ 78,009,000		$ 78,009,000				$ 267,461,000
AccumulatedTranslationAdjustmentMember
Accumulated other comprehensive income	332,000		332,000		104,000		257,000		133,000
Change in Other Comprehensive Income			115,000		(29,000)	[1]
Amount Reclassified from AOCI			0
Income Tax Benefit Expense			(40,000)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive income	77,677,000	[2]	77,677,000	[2]	273,124,000	[2],[3]	267,204,000	[2]	213,495,000	[2],[3]
Change in Other Comprehensive Income			(248,309,000)	[2]	59,629,000	[1],[2],[3]
Amount Reclassified from AOCI	(7,762,000)	[4],[5]	(43,271,000)	[2],[4],[5]
Income Tax Benefit Expense			102,053,000	[2]
Cash Flow Hedge Gain Loss To AOCI			(3,000,000)	[2]	3,000,000	[2]	0	[2]	3,000,000	[2]
Accumulated Other Comprehensive Income (loss) [Member]
Accumulated other comprehensive income	78,009,000		78,009,000		273,228,000		267,461,000		213,628,000
Change in Other Comprehensive Income			(248,194,000)		59,600,000	[1]
Amount Reclassified from AOCI	(7,762,000)	[4],[5]	(43,271,000)	[4],[5]
Income Tax Benefit Expense			$ 102,013,000

[1] Net of taxes.

[2] Includes cash flow hedges of ($3) million and $0 million as of September 30, 2013 and December 31, 2012, respectively, and $3 million as of both September 30, 2012 and December 31, 2011.

[3] _____________ Includes cash flow hedges of ($3) million and $0 million as of September 30, 2013 and December 31, 2012, respectively, and $3 million as of both September 30, 2012 and December 31, 2011.

[4] _____________ All amounts are shown before tax.

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