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Investments Gross Unrealized Losses and Fair Value by Investment Category (Details) (USD $)	Sep. 30, 2012 Securities	Dec. 31, 2011 Securities	Sep. 30, 2011
Investment Holdings [Line Items]
Individual Securities with Unrealized Losses	150	246
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Fixed Maturity Securities, Unrealized Losses, Percentage Investment Grade	90.00%		83.00%
Available-for-sale Securities [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Non-Income Producing Security, Number of Securities	1
Non-Income Producing Security, Principal Amount	4,500,000
Non-Income Producing Security, Unrealized Loss	(400,000)
Fixed Maturities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,036,199,000	1,197,562,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(13,262,000)	(74,512,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	647,194,000	965,549,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(57,051,000)	(83,424,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,683,393,000	2,163,111,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(70,313,000)	(157,936,000)
Fixed Maturities [Member] | US Government Corporations and Agencies Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	483,280,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(486,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	483,280,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(486,000)
Fixed Maturities [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	271,000	3,535,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(2,000)	(10,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	271,000	3,535,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(2,000)	(10,000)
Fixed Maturities [Member] | Foreign Government Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		14,282,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(242,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		14,282,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(242,000)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Finance, Insurance, and Real Estate Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	139,777,000	363,909,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(2,670,000)	(36,575,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	130,932,000	146,354,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(10,981,000)	(15,611,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	270,709,000	510,263,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(13,651,000)	(52,186,000)
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	63,759,000	59,342,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(12,289,000)	(16,590,000)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	63,759,000	59,342,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(12,289,000)	(16,590,000)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Manufacturing, Construction, and Mining Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	118,741,000	201,762,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(1,445,000)	(7,131,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	20,948,000	15,593,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(2,315,000)	(1,627,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	139,689,000	217,355,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(3,760,000)	(8,758,000)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Utilities and Related Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	63,822,000	174,251,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(549,000)	(7,576,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	50,043,000	37,778,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(7,868,000)	(6,946,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	113,865,000	212,029,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(8,417,000)	(14,522,000)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Wholesale and Retail Trade Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,368,000	15,523,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(447,000)	(188,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	9,900,000	9,275,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(561,000)	(1,194,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	22,268,000	24,798,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(1,008,000)	(1,382,000)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Services, Media, and Other Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	5,929,000	27,688,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(94,000)	(249,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	17,105,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	(2,895,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5,929,000	44,793,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(94,000)	(3,144,000)
Fixed Maturities [Member] | Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	168,342,000	295,352,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(7,091,000)	(19,920,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	404,344,000	709,612,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(33,911,000)	(52,161,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	572,686,000	1,004,964,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(41,002,000)	(72,081,000)
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	18,419,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(30,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	18,419,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(30,000)
Fixed Maturities [Member] | Asset-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	25,250,000	115,542,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(448,000)	(2,863,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	31,027,000	15,550,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(1,415,000)	(2,748,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	56,277,000	131,092,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(1,863,000)	(5,611,000)
Equity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	8,968,000	20,028,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(1,157,000)	(3,095,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	3,750,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	(1,250,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	8,968,000	23,778,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(1,157,000)	(4,345,000)

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