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Investments (Tables) | 3 Months Ended
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Mar. 31, 2013
Investments Abstract |
Available For Sale Securities |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Other-than-
|  |  |  |  |  |  |  |  |  |  |  | Estimated |  |  |  |  | temporary
March 31, 2013: | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | % of |  | impairments
|  |  | Cost |  | Gains |  | Losses |  | Value |  | Total |  | in AOCI
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate securities | $ | 11,464,082 |  | $ | 1,022,512 |  | $ | 45,093 |  | $ | 12,441,501 |  | 55.5 | % |  | $ | --
| Canadian and Canadian provincial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | governments |  | 2,681,603 |  |  | 1,261,728 |  |  | 1,133 |  |  | 3,942,198 |  | 17.6 |  |  |  | --
| Residential mortgage-backed securities |  | 1,005,232 |  |  | 75,579 |  |  | 4,041 |  |  | 1,076,770 |  | 4.8 |  |  |  | (241)
| Asset-backed securities |  | 752,280 |  |  | 23,333 |  |  | 19,069 |  |  | 756,544 |  | 3.4 |  |  |  | (2,259)
| Commercial mortgage-backed securities |  | 1,596,659 |  |  | 143,381 |  |  | 41,896 |  |  | 1,698,144 |  | 7.6 |  |  |  | (5,431)
| U.S. government and agencies |  | 299,395 |  |  | 31,938 |  |  | 132 |  |  | 331,201 |  | 1.5 |  |  |  | --
| State and political subdivisions |  | 281,215 |  |  | 37,628 |  |  | 5,746 |  |  | 313,097 |  | 1.4 |  |  |  | --
| Other foreign government, supranational and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | foreign government-sponsored enterprises |  | 1,758,483 |  |  | 87,306 |  |  | 3,585 |  |  | 1,842,204 |  | 8.2 |  |  |  | --
|  | Total fixed maturity securities | $ | 19,838,949 |  | $ | 2,683,405 |  | $ | 120,695 |  | $ | 22,401,659 |  | 100.0 | % |  | $ | (7,931)
Non-redeemable preferred stock | $ | 76,179 |  | $ | 7,940 |  | $ | 8 |  | $ | 84,111 |  | 38.1 | % |  |  |
Other equity securities |  | 138,088 |  |  | 295 |  |  | 1,829 |  |  | 136,554 |  | 61.9 |  |  |  |
|  | Total equity securities | $ | 214,267 |  | $ | 8,235 |  | $ | 1,837 |  | $ | 220,665 |  | 100.0 | % |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Other-than-
|  |  |  |  |  |  |  |  |  |  |  | Estimated |  |  |  |  | temporary
December 31, 2012: | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | % of |  | impairments
|  |  | Cost |  | Gains |  | Losses |  | Value |  | Total |  | in AOCI
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate securities | $ | 11,333,431 |  | $ | 1,085,973 |  | $ | 39,333 |  | $ | 12,380,071 |  | 55.5 | % |  | $ | --
| Canadian and Canadian provincial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | governments |  | 2,676,777 |  |  | 1,372,731 |  |  | 174 |  |  | 4,049,334 |  | 18.2 |  |  |  | --
| Residential mortgage-backed securities |  | 969,267 |  |  | 76,520 |  |  | 3,723 |  |  | 1,042,064 |  | 4.7 |  |  |  | (241)
| Asset-backed securities |  | 700,455 |  |  | 19,898 |  |  | 28,798 |  |  | 691,555 |  | 3.1 |  |  |  | (2,259)
| Commercial mortgage-backed securities |  | 1,608,376 |  |  | 142,369 |  |  | 51,842 |  |  | 1,698,903 |  | 7.6 |  |  |  | (6,125)
| U.S. government and agencies |  | 231,256 |  |  | 33,958 |  |  | 24 |  |  | 265,190 |  | 1.2 |  |  |  | --
| State and political subdivisions |  | 270,086 |  |  | 38,058 |  |  | 5,646 |  |  | 302,498 |  | 1.4 |  |  |  | --
| Other foreign government, supranational and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | foreign government-sponsored enterprises |  | 1,769,784 |  |  | 94,929 |  |  | 2,714 |  |  | 1,861,999 |  | 8.3 |  |  |  | --
|  | Total fixed maturity securities | $ | 19,559,432 |  | $ | 2,864,436 |  | $ | 132,254 |  | $ | 22,291,614 |  | 100.0 | % |  | $ | (8,625)
Non-redeemable preferred stock | $ | 68,469 |  | $ | 6,542 |  | $ | 170 |  | $ | 74,841 |  | 33.6 | % |  |  |
Other equity securities |  | 148,577 |  |  | 416 |  |  | 1,134 |  |  | 147,859 |  | 66.4 |  |  |  |
|  | Total equity securities | $ | 217,046 |  | $ | 6,958 |  | $ | 1,304 |  | $ | 222,700 |  | 100.0 | % |  |  |
Investments Classified By Contractual Maturity Date |
|  |  | Amortized |  | Fair |
|  |  | Cost |  | Value |
Available-for-sale: |  |  |  |  |  |
| Due in one year or less | $ | 348,130 |  | $ | 352,916 |
| Due after one year through five years |  | 3,716,625 |  |  | 3,917,468 |
| Due after five years through ten years |  | 6,922,683 |  |  | 7,521,433 |
| Due after ten years |  | 5,497,340 |  |  | 7,078,384 |
| Asset and mortgage-backed securities |  | 3,354,171 |  |  | 3,531,458 |
|  | Total | $ | 19,838,949 |  | $ | 22,401,659 |
Fixed Maturity Holdings Industry Types Weighted Average Credit Ratings [Table Text Block] |
March 31, 2013: |  |  |  |  | Estimated |  |  |  |  |  |
|  |  | Amortized Cost |  |  | Fair Value |  | % of Total |  |  |  |
Finance | $ | 3,693,500 |  | $ | 3,978,979 |  | 32.0 | % |  |  |
Industrial |  | 5,977,146 |  |  | 6,480,028 |  | 52.1 |  |  |  |
Utility |  | 1,763,573 |  |  | 1,951,839 |  | 15.7 |  |  |  |
Other |  | 29,863 |  |  | 30,655 |  | 0.2 |  |  |  |
| Total | $ | 11,464,082 |  | $ | 12,441,501 |  | 100.0 | % |  |  |
December 31, 2012: |  |  |  |  | Estimated |  |  |  |  |  |
|  |  | Amortized Cost |  |  | Fair Value |  | % of Total |  |  |  |
Finance | $ | 3,619,455 |  | $ | 3,900,152 |  | 31.5 | % |  |  |
Industrial |  | 5,881,967 |  |  | 6,443,846 |  | 52.0 |  |  |  |
Utility |  | 1,799,658 |  |  | 2,002,611 |  | 16.2 |  |  |  |
Other |  | 32,351 |  |  | 33,462 |  | 0.3 |  |  |  |
| Total | $ | 11,333,431 |  | $ | 12,380,071 |  | 100.0 | % |  |  |
RollForward Of Cumulative Credit Loss Component Of OTTI Income Loss |
| Three months ended March 31,
| 2013 |  | 2012
Balance, beginning of period | $ | 16,675 |  | $ | 63,947
Initial impairments - credit loss OTTI recognized on securities not previously impaired |  | -- |  |  | 1,902
Additional impairments - credit loss OTTI recognized on securities previously impaired |  | -- |  |  | 8,720
Credit loss OTTI previously recognized on securities impaired to fair value during the period |  | -- |  |  | (11,381)
Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period |  | (1,902) |  |  | (952)
Balance, end of period | $ | 14,773 |  | $ | 62,236
Accounting for Certain Loans and Debt Securities Acquired in Transfer Disclosure [Text Block] |
|  | March 31, 2013 |  | December 31, 2012
Outstanding principal and interest balance(1) | $ | 172,800 |  | $ | 108,831
Carrying value, including accrued interest(2) | $ | 134,564 |  | $ | 84,765
(1) | Represents the contractually required payments which is the sum of contractual principal, whether or not currently due, and accrued interest.
(2) | Estimated fair value plus accrued interest. |
Schedule Of Certain Loans Acquired In Transfer Accounted For As Available For Sale Debt Securities At Acquisition Date [Table Text Block] |
|  | At Date of
|  | Acquisition
Contractually required payments (including interest) | $ | 91,863
Cash flows expected to be collected(1) | $ | 72,940
Fair value of investments acquired | $ | 50,874
(1) | Represents undiscounted principal and interest cash flow expectations at the date of acquisition.
Schedule Of Certain Loans Acquired In Transfer Accounted For As Available For Sale Debt Securities Accretable Yield [Table Text Block] |
| Three months ended
| March 31, 2013
Balance, beginning of period | $ | 39,239
Investments purchased |  | 22,066
Accretion |  | (1,943)
Reclassification to nonaccretable difference |  | 553
Balance, end of period | $ | 59,915
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures |
|  | March 31, 2013 |  | December 31, 2012
|  | Gross |  |  |  |  | Gross |  |  |
|  | Unrealized |  |  |  |  | Unrealized |  |  |
|  | Losses |  | % of Total |  | Losses |  | % of Total
Less than 20% | $ | 66,235 |  | 54.1 | % |  | $ | 54,951 |  | 41.2 | %
20% or more for less than six months |  | -- |  | -- |  |  |  | 734 |  | 0.5 |
20% or more for six months or greater |  | 56,297 |  | 45.9 |  |  |  | 77,873 |  | 58.3 |
| Total | $ | 122,532 |  | 100.0 | % |  | $ | 133,558 |  | 100.0 | %
Fair Value And Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosures |
|  |  | Less than 12 months |  | 12 months or greater |  | Total
|  |  |  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross
March 31, 2013: | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized
|  |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
Investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate securities | $ | 1,187,238 |  | $ | 25,066 |  | $ | 89,284 |  | $ | 11,614 |  | $ | 1,276,522 |  | $ | 36,680
| Canadian and Canadian provincial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | governments |  | 59,042 |  |  | 1,133 |  |  | -- |  |  | -- |  |  | 59,042 |  |  | 1,133
| Residential mortgage-backed securities |  | 54,738 |  |  | 469 |  |  | 17,664 |  |  | 2,920 |  |  | 72,402 |  |  | 3,389
| Asset-backed securities |  | 91,530 |  |  | 672 |  |  | 86,661 |  |  | 7,216 |  |  | 178,191 |  |  | 7,888
| Commercial mortgage-backed securities |  | 79,509 |  |  | 471 |  |  | 21,920 |  |  | 6,521 |  |  | 101,429 |  |  | 6,992
| U.S. government and agencies |  | 56,975 |  |  | 132 |  |  | -- |  |  | -- |  |  | 56,975 |  |  | 132
| State and political subdivisions |  | 30,734 |  |  | 266 |  |  | 11,463 |  |  | 5,480 |  |  | 42,197 |  |  | 5,746
| Other foreign government, supranational and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | foreign government-sponsored enterprises |  | 335,216 |  |  | 2,809 |  |  | 7,375 |  |  | 744 |  |  | 342,591 |  |  | 3,553
|  | Total investment grade securities |  | 1,894,982 |  |  | 31,018 |  |  | 234,367 |  |  | 34,495 |  |  | 2,129,349 |  |  | 65,513
Non-investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate securities |  | 155,261 |  |  | 2,961 |  |  | 30,763 |  |  | 5,452 |  |  | 186,024 |  |  | 8,413
| Residential mortgage-backed securities |  | 18,215 |  |  | 298 |  |  | 4,681 |  |  | 354 |  |  | 22,896 |  |  | 652
| Asset-backed securities |  | 10,138 |  |  | 171 |  |  | 29,370 |  |  | 11,010 |  |  | 39,508 |  |  | 11,181
| Commercial mortgage-backed securities |  | -- |  |  | -- |  |  | 66,674 |  |  | 34,904 |  |  | 66,674 |  |  | 34,904
| Other foreign government, supranational and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | foreign government-sponsored enterprises |  | 1,034 |  |  | 32 |  |  | -- |  |  | -- |  |  | 1,034 |  |  | 32
|  | Total non-investment grade securities |  | 184,648 |  |  | 3,462 |  |  | 131,488 |  |  | 51,720 |  |  | 316,136 |  |  | 55,182
|  | Total fixed maturity securities | $ | 2,079,630 |  | $ | 34,480 |  | $ | 365,855 |  | $ | 86,215 |  | $ | 2,445,485 |  | $ | 120,695
| Non-redeemable preferred stock | $ | 7,885 |  | $ | 7 |  | $ | 1 |  | $ | 1 |  | $ | 7,886 |  | $ | 8
| Other equity securities |  | 110,187 |  |  | 1,829 |  |  | -- |  |  | -- |  |  | 110,187 |  |  | 1,829
|  | Total equity securities | $ | 118,072 |  | $ | 1,836 |  | $ | 1 |  | $ | 1 |  | $ | 118,073 |  | $ | 1,837
|  |  | Less than 12 months |  | 12 months or greater |  | Total
|  |  |  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross
December 31, 2012: | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized
|  |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
Investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate securities | $ | 786,203 |  | $ | 13,276 |  | $ | 108,187 |  | $ | 17,386 |  | $ | 894,390 |  | $ | 30,662
| Canadian and Canadian provincial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | governments |  | 12,349 |  |  | 174 |  |  | -- |  |  | -- |  |  | 12,349 |  |  | 174
| Residential mortgage-backed securities |  | 22,288 |  |  | 97 |  |  | 19,394 |  |  | 3,199 |  |  | 41,682 |  |  | 3,296
| Asset-backed securities |  | 59,119 |  |  | 449 |  |  | 96,179 |  |  | 9,508 |  |  | 155,298 |  |  | 9,957
| Commercial mortgage-backed securities |  | 89,507 |  |  | 797 |  |  | 29,181 |  |  | 7,974 |  |  | 118,688 |  |  | 8,771
| U.S. government and agencies |  | 7,272 |  |  | 24 |  |  | -- |  |  | -- |  |  | 7,272 |  |  | 24
| State and political subdivisions |  | 20,602 |  |  | 1,514 |  |  | 11,736 |  |  | 4,132 |  |  | 32,338 |  |  | 5,646
| Other foreign government, supranational and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | foreign government-sponsored enterprises |  | 244,817 |  |  | 1,953 |  |  | 7,435 |  |  | 761 |  |  | 252,252 |  |  | 2,714
|  | Total investment grade securities |  | 1,242,157 |  |  | 18,284 |  |  | 272,112 |  |  | 42,960 |  |  | 1,514,269 |  |  | 61,244
Non-investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate securities |  | 181,168 |  |  | 3,170 |  |  | 39,123 |  |  | 5,501 |  |  | 220,291 |  |  | 8,671
| Residential mortgage-backed securities |  | 15,199 |  |  | 80 |  |  | 2,633 |  |  | 347 |  |  | 17,832 |  |  | 427
| Asset-backed securities |  | 3,421 |  |  | 26 |  |  | 31,938 |  |  | 18,815 |  |  | 35,359 |  |  | 18,841
| Commercial mortgage-backed securities |  | 3,317 |  |  | 764 |  |  | 68,405 |  |  | 42,307 |  |  | 71,722 |  |  | 43,071
|  | Total non-investment grade securities |  | 203,105 |  |  | 4,040 |  |  | 142,099 |  |  | 66,970 |  |  | 345,204 |  |  | 71,010
|  | Total fixed maturity securities | $ | 1,445,262 |  | $ | 22,324 |  | $ | 414,211 |  | $ | 109,930 |  | $ | 1,859,473 |  | $ | 132,254
| Non-redeemable preferred stock | $ | 5,577 |  | $ | 52 |  | $ | 5,679 |  | $ | 118 |  | $ | 11,256 |  | $ | 170
| Other equity securities |  | 85,374 |  |  | 1,134 |  |  | -- |  |  | -- |  |  | 85,374 |  |  | 1,134
|  | Total equity securities | $ | 90,951 |  | $ | 1,186 |  | $ | 5,679 |  | $ | 118 |  | $ | 96,630 |  | $ | 1,304
Investment Income |
Investment Income, Net of Related Expenses
Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):
| Three months ended |
| March 31, |
| 2013 |  | 2012 |
Fixed maturity securities available-for-sale | $ | 239,244 |  | $ | 191,418 |
Mortgage loans on real estate |  | 28,243 |  |  | 14,965 |
Policy loans |  | 17,910 |  |  | 16,783 |
Funds withheld at interest |  | 137,259 |  |  | 115,014 |
Short-term investments |  | 813 |  |  | 988 |
Other invested assets |  | 13,922 |  |  | 11,322 |
Investment revenue |  | 437,391 |  |  | 350,490 |
Investment expense |  | 12,260 |  |  | 9,550 |
Investment income, net of related expenses | $ | 425,131 |  | $ | 340,940 |
Gain Loss On Investments |
Investment Related Gains (Losses), Net |  |  |
Investment related gains (losses), net consist of the following (dollars in thousands):
|  |  |  | Three months ended
|  |  |  | March 31,
|  |  |  | 2013 |  | 2012
Fixed maturities and equity securities available for sale: |  |  |  |  |  |
| Other-than-temporary impairment losses on fixed maturities |  | $ | (202) |  | $ | (7,607)
| Portion of loss recognized in accumulated other comprehensive income (before taxes) |  |  | -- |  |  | (7,221)
| Net other-than-temporary impairment losses on fixed maturities recognized in earnings |  |  | (202) |  |  | (14,828)
| Impairment losses on equity securities |  |  | -- |  |  | (839)
| Gain on investment activity |  |  | 21,680 |  |  | 22,312
| Loss on investment activity |  |  | (11,212) |  |  | (7,504)
Other impairment losses and change in mortgage loan provision |  |  | (1,626) |  |  | (5,843)
Derivatives and other, net |  |  | 85,731 |  |  | 50,222
Total investment related gains (losses), net |  | $ | 94,371 |  | $ | 43,520
Disclosure Of Real Estate Holdings By Property Type [Table Text Block] |
|  |  | March 31, 2013 |  | December 31, 2012
|  |  | Recorded |  | Percentage |  | Recorded |  | Percentage
Property type: | Investment |  | of Total |  | Investment |  | of Total
| Apartment | $ | 230,762 |  | 9.9 | % |  | $ | 229,266 |  | 9.9 | %
| Retail |  | 715,036 |  | 30.6 |  |  |  | 669,958 |  | 29.0 |
| Office building |  | 836,332 |  | 35.8 |  |  |  | 825,406 |  | 35.7 |
| Industrial |  | 426,011 |  | 18.2 |  |  |  | 455,682 |  | 19.7 |
| Other commercial |  | 126,974 |  | 5.5 |  |  |  | 131,855 |  | 5.7 |
Total | $ | 2,335,115 |  | 100.0 | % |  | $ | 2,312,167 |  | 100.0 | %
Disclosure Of Real Estate Holdings By Geographical Region [Table Text Block] |
|  |  | March 31, 2013 |  | December 31, 2012
|  |  | Recorded |  | Percentage |  | Recorded |  | Percentage
| Investment |  | of Total |  | Investment |  | of Total
Pacific | $ | 597,540 |  | 25.6 | % |  | $ | 593,589 |  | 25.7 | %
South Atlantic |  | 483,398 |  | 20.7 |  |  |  | 477,068 |  | 20.5 |
Mountain |  | 251,406 |  | 10.8 |  |  |  | 233,174 |  | 10.1 |
Middle Atlantic |  | 286,314 |  | 12.3 |  |  |  | 300,475 |  | 13.0 |
West North Central |  | 160,203 |  | 6.8 |  |  |  | 168,063 |  | 7.3 |
East North Central |  | 243,202 |  | 10.4 |  |  |  | 224,122 |  | 9.7 |
West South Central |  | 160,117 |  | 6.9 |  |  |  | 161,451 |  | 7.0 |
East South Central |  | 62,323 |  | 2.7 |  |  |  | 62,789 |  | 2.7 |
New England |  | 90,612 |  | 3.8 |  |  |  | 91,436 |  | 4.0 |
| Total | $ | 2,335,115 |  | 100.0 | % |  | $ | 2,312,167 |  | 100.0 | %
Mortgage Loans Classified By Contractual Maturity Date [Table Text Block] |
The maturities of the mortgage loans, gross of valuation allowances, as of March 31, 2013 and December 31, 2012 are as follows (dollars in thousands):
|  |  | March 31, 2013 |  | December 31, 2012 |  |  |
Due within five years | $ | 1,157,373 |  | $ | 1,187,387 |  |  |
Due after five years through ten years |  | 832,292 |  |  | 776,655 |  |  |
Due after ten years |  | 345,450 |  |  | 348,125 |  |  |
|  | Total | $ | 2,335,115 |  | $ | 2,312,167 |  |  |
Mortgage Loan Internal Credit Risk Grade [Table Text Block] |
Internal credit risk grade: | March 31, 2013 |  | December 31, 2012 |  |  |
| High investment grade | $ | 1,473,018 |  | $ | 1,235,605 |  |  |
| Investment grade |  | 622,794 |  |  | 834,494 |  |  |
| Average |  | 147,650 |  |  | 132,607 |  |  |
| Watch list |  | 62,679 |  |  | 76,463 |  |  |
| In or near default |  | 28,974 |  |  | 32,998 |  |  |
|  | Total | $ | 2,335,115 |  | $ | 2,312,167 |  |  |
Schedule Of Analysis Of Past Due Financing Receivables |
|  |  | March 31, 2013 |  | December 31, 2012 |  |  |
31-60 days past due | $ | 6,594 |  | $ | 7,504 |  |  |
61-90 days past due |  | -- |  |  | -- |  |  |
Greater than 90 days |  | 8,342 |  |  | 16,886 |  |  |
| Total past due |  | 14,936 |  |  | 24,390 |  |  |
Current |  | 2,320,179 |  |  | 2,287,777 |  |  |
|  | Total | $ | 2,335,115 |  | $ | 2,312,167 |  |  |
Recorded Investment And Allowance For Credit Losses |
The following table presents the recorded investment in mortgage loans, by method of evaluation of credit loss, and the related valuation allowances, by type of credit loss, at (dollars in thousands):
|  |  | March 31, 2013 |  | December 31, 2012 |  |  |
Mortgage loans: |  |  |  |  |  |  |  |
| Evaluated individually for credit losses | $ | 41,167 |  | $ | 39,956 |  |  |
| Evaluated collectively for credit losses |  | 2,293,948 |  |  | 2,272,211 |  |  |
|  | Mortgage loans, gross of valuation allowances |  | 2,335,115 |  |  | 2,312,167 |  |  |
Valuation allowances: |  |  |  |  |  |  |  |
| Specific for credit losses |  | 6,008 |  |  | 6,980 |  |  |
| Non-specifically identified credit losses |  | 3,916 |  |  | 4,600 |  |  |
|  | Total valuation allowances |  | 9,924 |  |  | 11,580 |  |  |
|  | Mortgage loans, net of valuation allowances | $ | 2,325,191 |  | $ | 2,300,587 |  |  |
Allowance For Mortgage Loan And Lease Losses Provision For Loss Net |
|  |  | Three Months Ended March 31,
|  |  | 2013 |  | 2012
Balance, beginning of period | $ | 11,580 |  | $ | 11,793
Charge-offs |  | (852) |  |  | (2,193)
Provision (release) |  | (804) |  |  | 5,050
Balance, end of period | $ | 9,924 |  | $ | 14,650
Impaired Financing Receivables Table |
|  | Unpaid Principal Balance |  | Recorded Investment |  | Related Allowance |  | Carrying Value
March 31, 2013: |  |  |  |  |  |  |  |  |  |  |
Impaired mortgage loans with no valuation allowance recorded | $ | 14,802 |  | $ | 14,259 |  | $ | -- |  | $ | 14,259
Impaired mortgage loans with valuation allowance recorded |  | 26,975 |  |  | 26,908 |  |  | 6,008 |  |  | 20,900
| Total impaired mortgage loans | $ | 41,777 |  | $ | 41,167 |  | $ | 6,008 |  | $ | 35,159
December 31, 2012: |  |  |  |  |  |  |  |  |  |  |
Impaired mortgage loans with no valuation allowance recorded | $ | 13,039 |  | $ | 12,496 |  | $ | -- |  | $ | 12,496
Impaired mortgage loans with valuation allowance recorded |  | 27,527 |  |  | 27,460 |  |  | 6,980 |  |  | 20,480
| Total impaired mortgage loans | $ | 40,566 |  | $ | 39,956 |  | $ | 6,980 |  | $ | 32,976
|  | Three Months Ended
|  | March 31, 2013 |  | March 31, 2012
| Average Investment(1) |  | Interest Income |  | Average Investment(1) |  | Interest Income
Impaired mortgage loans with no valuation allowance recorded | $ | 13,378 |  | $ | 135 |  | $ | 21,571 |  | $ | 169
Impaired mortgage loans with valuation allowance recorded |  | 27,184 |  |  | 240 |  |  | 37,308 |  |  | 308
| Total | $ | 40,562 |  | $ | 375 |  | $ | 58,879 |  | $ | 477
(1) | Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.
Schedule Of Other Invested Assets [Table Text Block] |
|  |  | March 31, 2013 |  | December 31, 2012 |  |  |
Equity securities | $ | 220,665 |  | $ | 222,700 |  |  |
Limited partnerships and real estate joint ventures |  | 375,451 |  |  | 356,419 |  |  |
Structured loans |  | 272,592 |  |  | 306,497 |  |  |
Derivatives |  | 151,761 |  |  | 168,208 |  |  |
Other |  | 109,182 |  |  | 105,719 |  |  |
| Total other invested assets | $ | 1,129,651 |  | $ | 1,159,543 |  |  |
Offsetting Assets And Liabilities [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Gross Amounts Not Offset in the Balance Sheet |  |  |
|  |  |  | Gross Amounts |  | Net Amounts |  |  |  | Cash Collateral |  |  |
|  | Gross Amounts |  | Offset in the |  | Presented in the |  | Financial |  | Pledged/ |  |  |
|  | Recognized |  | Balance Sheet |  | Balance Sheet |  | Instruments |  | Received |  | Net Amount
March 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Derivative assets | $ | 175,236 |  | $ | (23,475) |  | $ | 151,761 |  | $ | (17,664) |  | $ | (126,329) |  | $ | 7,768
| Derivative liabilities |  | 42,079 |  |  | (23,475) |  |  | 18,604 |  |  | (14,118) |  |  | (6,250) |  |  | (1,764)
December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Derivative assets | $ | 190,634 |  | $ | (22,426) |  | $ | 168,208 |  | $ | (22,458) |  | $ | (136,414) |  | $ | 9,336
| Derivative liabilities |  | 54,078 |  |  | (22,426) |  |  | 31,652 |  |  | (1,565) |  |  | (27,867) |  |  | 2,220

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