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Investments (Details 2) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position |  |
Amortized Cost/Cost | $ 5,136,280 | $ 4,984,389
Unrealized Gains | 655,608 | 470,496
Unrealized Losses | 9,836 | 33,053
Fair value of issued securities | 5,782,052 | 5,421,832
OTTI in AOCI | 3,039 | 2,136
Equity securities Amortized Cost/Cost | 37,292 | 23,070
Equity securities Fair Value | 39,211 | 26,774
Mortgage-backed securities [Member] |  |
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position |  |
Amortized Cost/Cost | 548,160 | 532,554
Unrealized Gains | 78,745 | 71,402
Unrealized Losses | 8 | 144
Fair value of issued securities | 626,897 | 603,812
OTTI in AOCI |  |
Other [Member] |  |
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position |  |
Amortized Cost/Cost | 423,863 | 560,036
Unrealized Gains | 39,716 | 43,705
Unrealized Losses | 1 |
Fair value of issued securities | 463,578 | 603,741
OTTI in AOCI |  |
Municipal bonds [Member] |  |
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position |  |
Amortized Cost/Cost | 1,374,655 | 1,291,281
Unrealized Gains | 185,834 | 122,857
Unrealized Losses | 1,280 | 1,020
Fair value of issued securities | 1,559,209 | 1,413,118
OTTI in AOCI |  |
Foreign government bonds [Member] |  |
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position |  |
Amortized Cost/Cost | 48,489 | 44,529
Unrealized Gains | 8,484 | 5,095
Unrealized Losses |  |
Fair value of issued securities | 56,973 | 49,624
OTTI in AOCI |  |
Corporate bonds [Member] |  |
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position |  |
Amortized Cost/Cost | 2,147,783 | 1,967,229
Unrealized Gains | 302,751 | 205,413
Unrealized Losses | 6,359 | 16,098
Fair value of issued securities | 2,444,175 | 2,156,544
OTTI in AOCI |  |
Other mortgage-backed securities [Member] |  |
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position |  |
Amortized Cost/Cost | 593,330 | 588,760
Unrealized Gains | 40,078 | 22,024
Unrealized Losses | 2,188 | 15,791
Fair value of issued securities | 631,220 | 594,993
OTTI in AOCI | 3,039 | 2,136
Equity securities [Member] |  |
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position |  |
Unrealized Gains | 2,673 | 4,030
Unrealized Losses | 754 | 326
OTTI in AOCI |  |
Equity securities Amortized Cost/Cost | 37,292 | 23,070
Equity securities Fair Value | $ 39,211 | $ 26,774

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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