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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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