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Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Investments [Abstract] |
Available-for-sale Securities [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Other-than-
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | temporary
December 31, 2012: | Amortized |  | Unrealized |  | Unrealized |  | Estimated |  | % of |  | impairments
|  |  | Cost |  | Gains |  | Losses |  | Fair 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 | % |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Other-than-
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | temporary
December 31, 2011: | Amortized |  | Unrealized |  | Unrealized |  | Estimated |  | % of |  | impairments
|  |  | Cost |  | Gains |  | Losses |  | Fair Value |  | Total |  | in AOCI
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate securities | $ | 6,931,958 |  | $ | 654,519 |  | $ | 125,371 |  | $ | 7,461,106 |  | 46.0 | % |  | $ | --
| Canadian and Canadian provincial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | governments |  | 2,507,802 |  |  | 1,362,160 |  |  | 29 |  |  | 3,869,933 |  | 23.9 |  |  |  | --
| Residential mortgage-backed securities |  | 1,167,265 |  |  | 76,393 |  |  | 16,424 |  |  | 1,227,234 |  | 7.6 |  |  |  | (1,042)
| Asset-backed securities |  | 443,974 |  |  | 11,692 |  |  | 53,675 |  |  | 401,991 |  | 2.5 |  |  |  | (5,256)
| Commercial mortgage-backed securities |  | 1,233,958 |  |  | 87,750 |  |  | 79,489 |  |  | 1,242,219 |  | 7.7 |  |  |  | (12,225)
| U.S. government and agencies |  | 341,087 |  |  | 32,976 |  |  | 61 |  |  | 374,002 |  | 2.3 |  |  |  | --
| State and political subdivisions |  | 184,308 |  |  | 24,419 |  |  | 3,341 |  |  | 205,386 |  | 1.3 |  |  |  | --
| Other foreign government, supranational and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | foreign government-sponsored enterprises |  | 1,372,528 |  |  | 50,127 |  |  | 3,576 |  |  | 1,419,079 |  | 8.7 |  |  |  | --
|  | Total fixed maturity securities | $ | 14,182,880 |  | $ | 2,300,036 |  | $ | 281,966 |  | $ | 16,200,950 |  | 100.0 | % |  | $ | (18,523)
Non-redeemable preferred stock | $ | 82,488 |  | $ | 4,677 |  | $ | 8,982 |  | $ | 78,183 |  | 68.6 | % |  |  |
Other equity securities |  | 35,352 |  |  | 1,903 |  |  | 1,538 |  |  | 35,717 |  | 31.4 |  |  |  |
|  | Total equity securities | $ | 117,840 |  | $ | 6,580 |  | $ | 10,520 |  | $ | 113,900 |  | 100.0 | % |  |  |
Investments Classified By Contractual Maturity Date [Table Text Block] |
|  |  | Amortized |  | Fair |
|  |  | Cost |  | Value |
Available-for-sale: |  |  |  |  |  |
| Due in one year or less | $ | 294,720 |  | $ | 299,389 |
| Due after one year through five years |  | 3,785,992 |  |  | 3,983,272 |
| Due after five year through ten years |  | 6,592,768 |  |  | 7,198,997 |
| Due after ten years |  | 5,607,854 |  |  | 7,377,434 |
| Asset and mortgage-backed securities |  | 3,278,098 |  |  | 3,432,522 |
|  | Total | $ | 19,559,432 |  | $ | 22,291,614 |
Fixed Maturity Holdings Industry Types [Table Text Block] |
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 | % |  |  |
December 31, 2011: |  |  |  |  | Estimated |  |  |  |  |  |
|  |  | Amortized Cost |  |  | Fair Value |  | % of Total |  |  |  |
Finance | $ | 2,411,175 |  | $ | 2,442,149 |  | 32.7 | % |  |  |
Industrial |  | 3,402,099 |  |  | 3,760,187 |  | 50.4 |  |  |  |
Utility |  | 1,115,384 |  |  | 1,255,090 |  | 16.9 |  |  |  |
Other |  | 3,300 |  |  | 3,680 |  | -- |  |  |  |
| Total | $ | 6,931,958 |  | $ | 7,461,106 |  | 100.0 | % |  |  |
Roll Forward Of Cumulative Credit Loss Component Of Otti Income Loss [Table Text Block] |
| 2012 |  | 2011 |  | 2010
Balance, beginning of period | $ | 63,947 |  | $ | 47,291 |  | $ | 47,905
Initial impairments - credit loss OTTI recognized on securities not previously impaired |  | 1,962 |  |  | 8,349 |  |  | 7,359
Additional impairments - credit loss OTTI recognized on securities previously impaired |  | 10,186 |  |  | 9,059 |  |  | 9,346
Credit loss OTTI previously recognized on securities impaired to fair value during the period |  | (22,290) |  |  | -- |  |  | --
Credit loss previously recognized on securities which matured, paid down, prepaid or were sold during the period |  | (37,130) |  |  | (752) |  |  | (17,319)
Balance, end of period | $ | 16,675 |  | $ | 63,947 |  | $ | 47,291
AccountingForCertainLoansAndDebtSecuritiesAcquiredInTransferDisclosureTextBlock |
|  | December 31, 2012 |  |  |
Outstanding principal and interest balance(1) | $ | 108,831 |  |  |
Carrying value, including accrued interest(2) | $ | 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) | $ | 152,988
Cash flows expected to be collected(1) | $ | 125,449
Fair value of investments acquired | $ | 85,298
(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] |
| Year ended
| December 31, 2012
Balance, beginning of period | $ | --
Investments purchased |  | 40,151
Accretion |  | (1,388)
Disposals |  | --
Reclassification from nonaccretable difference |  | 476
Balance, end of period | $ | 39,239
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures [Table Text Block] |
|  | December 31, 2012 |  | December 31, 2011
|  | Gross |  |  |  |  | Gross |  |  |
|  | Unrealized |  |  |  |  | Unrealized |  |  |
|  | Losses |  | % of Total |  | Losses |  | % of Total
Less than 20% | $ | 54,951 |  | 41.2 | % |  | $ | 131,155 |  | 44.8 | %
20% or more for less than six months |  | 734 |  | 0.5 |  |  |  | 51,503 |  | 17.6 |
20% or more for six months or greater |  | 77,873 |  | 58.3 |  |  |  | 109,828 |  | 37.6 |
| Total | $ | 133,558 |  | 100.0 | % |  | $ | 292,486 |  | 100.0 | %
Fair Value And Investments In Debt And Equity Securities Disclosures [Table Text Block] |
|  |  | 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
|  |  | Less than 12 months |  | 12 months or greater |  | Total
|  |  |  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross
December 31, 2011: | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized
|  |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
Investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate securities | $ | 790,758 |  | $ | 40,180 |  | $ | 286,244 |  | $ | 63,117 |  | $ | 1,077,002 |  | $ | 103,297
| Canadian and Canadian provincial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | governments |  | 3,094 |  |  | 29 |  |  | -- |  |  | -- |  |  | 3,094 |  |  | 29
| Residential mortgage-backed securities |  | 128,622 |  |  | 3,549 |  |  | 58,388 |  |  | 10,382 |  |  | 187,010 |  |  | 13,931
| Asset-backed securities |  | 101,263 |  |  | 3,592 |  |  | 93,910 |  |  | 29,036 |  |  | 195,173 |  |  | 32,628
| Commercial mortgage-backed securities |  | 109,455 |  |  | 3,538 |  |  | 58,979 |  |  | 22,001 |  |  | 168,434 |  |  | 25,539
| U.S. government and agencies |  | 1,764 |  |  | 61 |  |  | -- |  |  | -- |  |  | 1,764 |  |  | 61
| State and political subdivisions |  | 21,045 |  |  | 1,845 |  |  | 12,273 |  |  | 1,268 |  |  | 33,318 |  |  | 3,113
| Other foreign government, supranational and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | foreign government-sponsored enterprises |  | 148,416 |  |  | 1,085 |  |  | 16,588 |  |  | 2,491 |  |  | 165,004 |  |  | 3,576
|  | Total investment grade securities |  | 1,304,417 |  |  | 53,879 |  |  | 526,382 |  |  | 128,295 |  |  | 1,830,799 |  |  | 182,174
Non-investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate securities |  | 212,795 |  |  | 10,852 |  |  | 47,310 |  |  | 11,222 |  |  | 260,105 |  |  | 22,074
| Residential mortgage-backed securities |  | 23,199 |  |  | 712 |  |  | 10,459 |  |  | 1,781 |  |  | 33,658 |  |  | 2,493
| Asset-backed securities |  | 2,363 |  |  | 940 |  |  | 21,275 |  |  | 20,107 |  |  | 23,638 |  |  | 21,047
| Commercial mortgage-backed securities |  | 34,918 |  |  | 7,220 |  |  | 62,357 |  |  | 46,730 |  |  | 97,275 |  |  | 53,950
| State and political subdivisions |  | 4,000 |  |  | 228 |  |  | -- |  |  | -- |  |  | 4,000 |  |  | 228
|  | Total non-investment grade securities |  | 277,275 |  |  | 19,952 |  |  | 141,401 |  |  | 79,840 |  |  | 418,676 |  |  | 99,792
|  | Total fixed maturity securities | $ | 1,581,692 |  | $ | 73,831 |  | $ | 667,783 |  | $ | 208,135 |  | $ | 2,249,475 |  | $ | 281,966
| Non-redeemable preferred stock | $ | 19,516 |  | $ | 4,478 |  | $ | 15,694 |  | $ | 4,504 |  | $ | 35,210 |  | $ | 8,982
| Other equity securities |  | 1,662 |  |  | 602 |  |  | 5,905 |  |  | 936 |  |  | 7,567 |  |  | 1,538
|  | Total equity securities | $ | 21,178 |  | $ | 5,080 |  | $ | 21,599 |  | $ | 5,440 |  | $ | 42,777 |  | $ | 10,520
Investment Income [Table Text Block] |
Investment Income, Net of Related Expenses
Major categories of investment income, net of related expenses consist of the following (dollars in thousands):
| 2012 |  | 2011 |  | 2010 |  |
Fixed maturity securities available-for-sale | $ | 868,682 |  | $ | 757,726 |  | $ | 715,817 |  |  |
Mortgage loans on real estate |  | 96,901 |  |  | 55,931 |  |  | 51,186 |  |  |
Policy loans |  | 62,855 |  |  | 66,621 |  |  | 72,743 |  |  |
Funds withheld at interest |  | 393,586 |  |  | 388,694 |  |  | 385,762 |  |  |
Short-term investments |  | 4,173 |  |  | 2,378 |  |  | 4,968 |  |  |
Other invested assets |  | 49,199 |  |  | 39,939 |  |  | 33,187 |  |  |
Investment income |  | 1,475,396 |  |  | 1,311,289 |  |  | 1,263,663 |  |  |
Investment expense |  | (39,190) |  |  | (30,092) |  |  | (25,003) |  |  |
Investment income, net of related expenses | $ | 1,436,206 |  | $ | 1,281,197 |  | $ | 1,238,660 |  |  |
Gain (Loss) on Investments [Table Text Block] |
Investment Related Gains (Losses), Net |  |  |  |  |  |  |  |  |
Investment related gains (losses), net, consist of the following (dollars in thousands): |  |  |  |  |  |
|  |  |  | 2012 |  | 2011 |  | 2010 |  |
Fixed maturity and equity securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
| Other-than-temporary impairment losses on fixed maturities |  | $ | (15,908) |  | $ | (30,873) |  | $ | (31,920) |  |  |
| Portion of loss recognized in accumulated other |  |  |  |  |  |  |  |  |  |  |  |
|  | comprehensive income (before taxes) |  |  | (7,618) |  |  | 3,924 |  |  | 2,045 |  |  |
| Net other-than-temporary impairment losses on fixed |  |  |  |  |  |  |  |  |  |  |  |
|  | maturity securities recognized in earnings |  |  | (23,526) |  |  | (26,949) |  |  | (29,875) |  |  |
| Impairment losses on equity securities |  |  | (3,025) |  |  | (4,116) |  |  | (32) |  |  |
| Gain on investment activity |  |  | 145,268 |  |  | 132,045 |  |  | 100,957 |  |  |
| Loss on investment activity |  |  | (27,474) |  |  | (26,996) |  |  | (28,730) |  |  |
Other impairment losses (primarily mortgage loans and limited partnerships) |  |  | (16,602) |  |  | (10,238) |  |  | (5,976) |  |  |
Derivatives and other, net |  |  | 179,495 |  |  | (99,802) |  |  | 175,686 |  |  |
Total investment related gains (losses), net |  | $ | 254,136 |  | $ | (36,056) |  | $ | 212,030 |  |  |
Disclosure Of Real Estate Holdings By Property Type [Table Text Block] |
|  |  | 2012 |  | 2011
|  |  | Recorded Investment |  | Percentage of Total |  | Recorded Investment |  | Percentage of Total
Property type: |  |  |  |  |  |  |
| Apartment | $ | 229,266 |  | 9.9 | % |  | $ | 124,674 |  | 12.4 | %
| Retail |  | 669,958 |  | 29.0 |  |  |  | 335,745 |  | 33.5 |
| Office building |  | 825,406 |  | 35.7 |  |  |  | 264,584 |  | 26.4 |
| Industrial |  | 455,682 |  | 19.7 |  |  |  | 200,762 |  | 20.0 |
| Other commercial |  | 131,855 |  | 5.7 |  |  |  | 77,759 |  | 7.7 |
Total | $ | 2,312,167 |  | 100.0 | % |  | $ | 1,003,524 |  | 100.0 | %
Disclosure Of Real Estate Holdings By Geographical Region [Table Text Block] |
|  |  | 2012 |  | 2011
|  |  | Recorded Investment |  | Percentage of Total |  | Recorded Investment |  | Percentage of Total
Pacific | $ | 593,589 |  | 25.7 | % |  | $ | 269,922 |  | 26.9 | %
South Atlantic |  | 477,068 |  | 20.5 |  |  |  | 233,534 |  | 23.3 |
Mountain |  | 233,174 |  | 10.1 |  |  |  | 116,224 |  | 11.6 |
Middle Atlantic |  | 300,475 |  | 13.0 |  |  |  | 86,590 |  | 8.6 |
West North Central |  | 168,063 |  | 7.3 |  |  |  | 69,789 |  | 7.0 |
East North Central |  | 224,122 |  | 9.7 |  |  |  | 92,861 |  | 9.2 |
West South Central |  | 161,451 |  | 7.0 |  |  |  | 58,506 |  | 5.8 |
East South Central |  | 62,789 |  | 2.7 |  |  |  | 40,767 |  | 4.1 |
New England |  | 91,436 |  | 4.0 |  |  |  | 35,331 |  | 3.5 |
| Total | $ | 2,312,167 |  | 100.0 | % |  | $ | 1,003,524 |  | 100.0 | %
Disclosure of Real Estate Holdings Classified By Contractual Maturity Date [Table Text Block] |
The maturities of the mortgage loans, gross of valuation allowances, as of December 31, 2012 and 2011 are as follows (dollars in thousands):
|  |  | 2012 |  | 2011 |  |  |
Due one year through five years | $ | 1,187,387 |  | $ | 493,027 |  |  |
Due after five years |  | 776,655 |  |  | 299,252 |  |  |
Due after ten years |  | 348,125 |  |  | 211,245 |  |  |
|  | Total | $ | 2,312,167 |  | $ | 1,003,524 |  |  |
Mortgage Loan Internal Credit Risk Grade [Table Text Block] |
Internal credit quality grade: | 2012 |  | 2011 |  |  |
| High investment grade | $ | 1,235,605 |  | $ | 252,333 |  |  |
| Investment grade |  | 834,494 |  |  | 526,608 |  |  |
| Average |  | 132,607 |  |  | 105,177 |  |  |
| Watch list |  | 76,463 |  |  | 91,037 |  |  |
| In or near default |  | 32,998 |  |  | 28,369 |  |  |
|  | Total | $ | 2,312,167 |  | $ | 1,003,524 |  |  |
Schedule Of Analysis Of Past Due Financing Receivables [Table Text Block] |
The age analysis of the Company's past due recorded investment in mortgage loans, gross of valuation allowances, as of December 31, 2012 and 2011 are as follows (dollars in thousands):
|  |  | 2012 |  | 2011 |  |  |
31-60 days past due | $ | 7,504 |  | $ | 21,800 |  |  |
61-90 days past due |  | -- |  |  | -- |  |  |
Greater than 90 days |  | 16,886 |  |  | 20,316 |  |  |
| Total past due |  | 24,390 |  |  | 42,116 |  |  |
Current |  | 2,287,777 |  |  | 961,408 |  |  |
|  | Total | $ | 2,312,167 |  | $ | 1,003,524 |  |  |
Recorded Investment And Allowance For Credit Losses [Table Text Block] |
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):
|  |  | December 31, |  |  |  |
|  |  | 2012 |  | 2011 |  |  |
Mortgage loans: |  |  |  |  |  |  |  |  |
| Evaluated individually for credit losses | $ | 39,956 |  | $ | 60,904 |  |  |  |
| Evaluated collectively for credit losses |  | 2,272,211 |  |  | 942,620 |  |  |  |
|  | Mortgage loans, gross of valuation allowances |  | 2,312,167 |  |  | 1,003,524 |  |  |  |
Valuation allowances: |  |  |  |  |  |  |  |  |
| Specific for credit losses |  | 6,980 |  |  | 8,188 |  |  |  |
| Non-specifically identified credit losses |  | 4,600 |  |  | 3,605 |  |  |  |
|  | Total valuation allowances |  | 11,580 |  |  | 11,793 |  |  |  |
|  | Mortgage loans, net of valuation allowances | $ | 2,300,587 |  | $ | 991,731 |  |  |  |
Allowance For Loan And Lease Losses Provision For Loss Net [Table Text Block] |
Information regarding the Company's loan valuation allowances for mortgage loans as of December 31, 2012, 2011 and 2010 are as follows (dollars in thousands):
|  |  | 2012 |  | 2011 |  | 2010 |
Balance, beginning of period | $ | 11,793 |  | $ | 6,239 |  | $ | 5,784 |
Charge-offs |  | (6,474) |  |  | (3,947) |  |  | -- |
Provision |  | 6,261 |  |  | 9,501 |  |  | 455 |
Balance, end of period | $ | 11,580 |  | $ | 11,793 |  | $ | 6,239 |
Impaired Financing Receivables [Table Text Block] |
|  | Unpaid Principal Balance |  | Recorded Investment |  | Related Allowance |  | Carrying Value
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
December 31, 2011: |  |  |  |  |  |  |  |  |  |  |
Impaired mortgage loans with no valuation allowance recorded | $ | 32,088 |  | $ | 31,496 |  | $ | -- |  | $ | 31,496
Impaired mortgage loans with valuation allowance recorded |  | 29,724 |  |  | 29,408 |  |  | 8,188 |  |  | 21,220
| Total impaired mortgage loans | $ | 61,812 |  | $ | 60,904 |  | $ | 8,188 |  | $ | 52,716
The Company's average investment balance of impaired mortgage loans and the related interest income are reflected in the table below for the years ended December 31, 2012, 2011 and 2010 (dollars in thousands):
|  | 2012 |  | 2011 |  | 2010
| Average Investment(1) |  | Interest Income |  | Average Investment(1) |  | Interest Income |  | Average Investment(1) |  | Interest Income
Impaired mortgage loans with no valuation allowance recorded | $ | 15,549 |  | $ | 1,244 |  | $ | 14,877 |  | $ | 630 |  | $ | 19,253 |  | $ | 525
Impaired mortgage loans with valuation allowance recorded |  | 34,434 |  |  | 425 |  |  | 27,712 |  |  | 418 |  |  | 21,925 |  |  | 295
| Total | $ | 49,983 |  | $ | 1,669 |  | $ | 42,589 |  | $ | 1,048 |  | $ | 41,178 |  | $ | 820
(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] |
|  |  | December 31, |  |  |
|  |  | 2012 |  | 2011 |  |  |
Equity securities | $ | 222,700 |  | $ | 113,900 |  |  |
Limited partnerships and real estate joint ventures |  | 356,419 |  |  | 251,315 |  |  |
Structured loans |  | 306,497 |  |  | 281,022 |  |  |
Derivatives |  | 168,208 |  |  | 257,050 |  |  |
Other |  | 105,719 |  |  | 109,254 |  |  |
| Total other invested assets | $ | 1,159,543 |  | $ | 1,012,541 |  |  |
InvestmentTableTextBlock |
|  |  |  | Amortized Cost/ |  | Estimated Fair Value |
|  |  |  | Recorded Investment |  | at Date of Transfer |
Fixed maturity securities – available for sale: |  |  |  |  |  |
| Corporate securities | $ | 2,585,095 |  | $ | 2,606,816 |
| Asset-backed securities |  | 137,251 |  |  | 138,918 |
| Commercial mortgage-backed securities |  | 703,313 |  |  | 704,065 |
| U.S. Government and agencies securities |  | 240,952 |  |  | 256,168 |
| State and political subdivision securities |  | 27,297 |  |  | 27,555 |
| Other foreign government, supranational, and |  |  |  |  |  |
|  | foreign government-sponsored enterprises |  | 56,776 |  |  | 55,437 |
|  |  | Total fixed maturity securities – available for sale |  | 3,750,684 |  |  | 3,788,959 |
Mortgage loans on real estate |  | 1,009,454 |  |  | 1,021,661 |
Short-term investments |  | 101,428 |  |  | 101,338 |
Cash and cash equivalents |  | 501,593 |  |  | 501,593 |
Accrued interest |  | 43,739 |  |  | 43,739 |
|  |  | Total | $ | 5,406,898 |  | $ | 5,457,290 |

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