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Investments (Details 2) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Fixed Maturities and Equity Securities |  |
Amortized Cost/Cost | $ 5,146,873 | $ 4,984,389
Unrealized Gains | 564,090 | 470,496
Unrealized Losses | 16,237 | 33,053
Fair value of issued securities | 5,694,726 | 5,421,832
OTTI in AOCI | 2,435 | 2,136
Equity securities Amortized Cost/Cost | 37,199 | 23,070
Equity securities Fair Value | 38,035 | 26,774
Mortgage-backed securities [Member] |  |
Fixed Maturities and Equity Securities |  |
Amortized Cost/Cost | 552,090 | 532,554
Unrealized Gains | 77,445 | 71,402
Unrealized Losses | 5 | 144
Fair value of issued securities | 629,530 | 603,812
Other [Member] |  |
Fixed Maturities and Equity Securities |  |
Amortized Cost/Cost | 451,983 | 560,036
Unrealized Gains | 37,070 | 43,705
Unrealized Losses | 103 |
Fair value of issued securities | 488,950 | 603,741
Municipal bonds [Member] |  |
Fixed Maturities and Equity Securities |  |
Amortized Cost/Cost | 1,349,819 | 1,291,281
Unrealized Gains | 162,108 | 122,857
Unrealized Losses | 2,419 | 1,020
Fair value of issued securities | 1,509,508 | 1,413,118
Foreign government bonds [Member] |  |
Fixed Maturities and Equity Securities |  |
Amortized Cost/Cost | 48,503 | 44,529
Unrealized Gains | 7,103 | 5,095
Fair value of issued securities | 55,606 | 49,624
Corporate bonds [Member] |  |
Fixed Maturities and Equity Securities |  |
Amortized Cost/Cost | 2,174,764 | 1,967,229
Unrealized Gains | 250,421 | 205,413
Unrealized Losses | 10,720 | 16,098
Fair value of issued securities | 2,414,465 | 2,156,544
Other mortgage-backed securities [Member] |  |
Fixed Maturities and Equity Securities |  |
Amortized Cost/Cost | 569,714 | 588,760
Unrealized Gains | 29,943 | 22,024
Unrealized Losses | 2,990 | 15,791
Fair value of issued securities | 596,667 | 594,993
OTTI in AOCI | 2,435 | 2,136
Equity Securities [Member] |  |
Fixed Maturities and Equity Securities |  |
Unrealized Gains | 2,013 | 4,030
Unrealized Losses | $ 1,177 | $ 326

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