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Investments (Tables) | 3 Months Ended
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Mar. 31, 2015
Investments [Abstract] |
Available For Sale Securities | The following tables provide information relating to investments in fixed maturity and equity securities by sector as of March 31, 2015 and December 31, 2014 (dollars in thousands):
March 31, 2015: |  | Amortized |  | Unrealized |  | Unrealized |  | Estimated Fair |  | % of |  | Other-than- temporary impairments
|  | Cost |  | Gains |  | Losses |  | Value |  | Total |  | in AOCI
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | $ | 14,084,589 |  |  | $ | 1,159,377 |  |  | $ | 64,831 |  |  | $ | 15,179,135 |  |  | 58.8 | % |  | $ | — |
Canadian and Canadian provincial governments |  | 2,477,703 |  |  | 1,416,036 |  |  | — |  |  | 3,893,739 |  |  | 15.1 |  |  | — |
Residential mortgage-backed securities |  | 1,072,415 |  |  | 60,491 |  |  | 5,232 |  |  | 1,127,674 |  |  | 4.4 |  |  | (300 | )
Asset-backed securities |  | 1,082,883 |  |  | 23,322 |  |  | 8,093 |  |  | 1,098,112 |  |  | 4.3 |  |  | 354 |
Commercial mortgage-backed securities |  | 1,448,372 |  |  | 93,304 |  |  | 7,402 |  |  | 1,534,274 |  |  | 5.9 |  |  | (1,609 | )
U.S. government and agencies |  | 444,529 |  |  | 28,879 |  |  | — |  |  | 473,408 |  |  | 1.8 |  |  | — |
State and political subdivisions |  | 378,403 |  |  | 54,496 |  |  | 3,128 |  |  | 429,771 |  |  | 1.7 |  |  | — |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 1,944,822 |  |  | 129,615 |  |  | 9,327 |  |  | 2,065,110 |  |  | 8.0 |  |  | — |
Total fixed maturity securities |  | $ | 22,933,716 |  |  | $ | 2,965,520 |  |  | $ | 98,013 |  |  | $ | 25,801,223 |  |  | 100.0 | % |  | $ | (1,555 | )
Non-redeemable preferred stock |  | $ | 90,643 |  |  | $ | 5,136 |  |  | $ | 1,405 |  |  | $ | 94,374 |  |  | 70.1 | % |  |
Other equity securities |  | 39,395 |  |  | 894 |  |  | 44 |  |  | 40,245 |  |  | 29.9 |  |  |
Total equity securities |  | $ | 130,038 |  |  | $ | 6,030 |  |  | $ | 1,449 |  |  | $ | 134,619 |  |  | 100.0 | % |  |
December 31, 2014: |  | Amortized |  | Unrealized |  | Unrealized |  | Estimated Fair |  | % of |  | Other-than- temporary impairments
|  | Cost |  | Gains |  | Losses |  | Value |  | Total |  | in AOCI
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | $ | 14,010,604 |  |  | $ | 965,523 |  |  | $ | 90,544 |  |  | $ | 14,885,583 |  |  | 58.4 | % |  | $ | — |
Canadian and Canadian provincial governments |  | 2,668,852 |  |  | 1,196,420 |  |  | 7 |  |  | 3,865,265 |  |  | 15.2 |  |  | — |
Residential mortgage-backed securities |  | 991,867 |  |  | 52,640 |  |  | 6,611 |  |  | 1,037,896 |  |  | 4.1 |  |  | (300 | )
Asset-backed securities |  | 1,059,660 |  |  | 20,301 |  |  | 10,375 |  |  | 1,069,586 |  |  | 4.2 |  |  | 354 |
Commercial mortgage-backed securities |  | 1,453,657 |  |  | 87,593 |  |  | 8,659 |  |  | 1,532,591 |  |  | 6.0 |  |  | (1,609 | )
U.S. government and agencies |  | 501,352 |  |  | 25,014 |  |  | 515 |  |  | 525,851 |  |  | 2.0 |  |  | — |
State and political subdivisions |  | 378,457 |  |  | 51,117 |  |  | 3,498 |  |  | 426,076 |  |  | 1.7 |  |  | — |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 2,041,148 |  |  | 110,065 |  |  | 13,089 |  |  | 2,138,124 |  |  | 8.4 |  |  | — |
Total fixed maturity securities |  | $ | 23,105,597 |  |  | $ | 2,508,673 |  |  | $ | 133,298 |  |  | $ | 25,480,972 |  |  | 100.0 | % |  | $ | (1,555 | )
Non-redeemable preferred stock |  | $ | 93,540 |  |  | $ | 7,350 |  |  | $ | 1,527 |  |  | $ | 99,363 |  |  | 78.3 | % |  |
Other equity securities |  | 26,994 |  |  | 597 |  |  | 94 |  |  | 27,497 |  |  | 21.7 |  |  |
Total equity securities |  | $ | 120,534 |  |  | $ | 7,947 |  |  | $ | 1,621 |  |  | $ | 126,860 |  |  | 100.0 | % |  |
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] | The following table includes fixed maturity securities pledged and received as collateral, and assets in trust held to satisfy collateral requirements under certain third-party reinsurance treaties as of March 31, 2015 and December 31, 2014 (dollars in thousands):
| March 31, 2015 |  | December 31, 2014
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Fixed maturity securities pledged as collateral | $ | 148,411 |  |  | $ | 160,448 |  |  | $ | 127,229 |  |  | $ | 134,863 |
Fixed maturity securities received as collateral | n/a |  |  | 128,643 |  |  | n/a |  |  | 117,227 |
Securities held in trust | 9,719,868 |  |  | 10,628,413 |  |  | 10,197,489 |  |  | 10,922,947 |
Concentration Risk Disclosure [Text Block] | The Company’s exposure to concentrations of credit risk of single issuers greater than 10% of the Company’s stockholders’ equity as of March 31, 2015 and December 31, 2014 is as follows (dollars in thousands).
| March 31, 2015 |  | December 31, 2014
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Fixed maturity securities guaranteed or issued by: |  |  |  |  |  |  |
Canadian province of Ontario | $ | 901,634 |  |  | $ | 1,351,722 |  |  | $ | 979,908 |  |  | $ | 1,359,339 |
Canadian province of Quebec | 934,860 |  |  | 1,628,425 |  |  | 1,006,315 |  |  | 1,599,673 |
Investments Classified By Contractual Maturity Date | The amortized cost and estimated fair value of fixed maturity securities available-for-sale at March 31, 2015 are shown by contractual maturity in the table below (dollars in thousands). Actual maturities can differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date.
|  | Amortized Cost |  | Estimated Fair Value
Available-for-sale: |  |  |  |
Due in one year or less |  | $ | 594,886 |  |  | $ | 600,953 |
Due after one year through five years |  | 4,504,020 |  |  | 4,771,660 |
Due after five years through ten years |  | 7,388,162 |  |  | 7,862,501 |
Due after ten years |  | 6,842,978 |  |  | 8,806,049 |
Asset and mortgage-backed securities |  | 3,603,670 |  |  | 3,760,060 |
Total |  | $ | 22,933,716 |  |  | $ | 25,801,223 |
Fixed Maturity Holdings Industry Types Weighted Average Credit Ratings [Table Text Block] | The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of March 31, 2015 and December 31, 2014 (dollars in thousands):
March 31, 2015: |  |  |  | Estimated |  |
|  | Amortized Cost |  | Fair Value |  | % of Total
Finance |  | $ | 4,842,257 |  |  | $ | 5,186,461 |  |  | 34.2 | %
Industrial |  | 7,699,936 |  |  | 8,270,678 |  |  | 54.4 |
Utility |  | 1,542,396 |  |  | 1,721,996 |  |  | 11.4 |
Total |  | $ | 14,084,589 |  |  | $ | 15,179,135 |  |  | 100.0 | %
December 31, 2014: |  |  |  | Estimated |  |
|  | Amortized Cost |  | Fair Value |  | % of Total
Finance |  | $ | 4,789,568 |  |  | $ | 5,066,408 |  |  | 34.0 | %
Industrial |  | 7,639,330 |  |  | 8,086,067 |  |  | 54.3 |
Utility |  | 1,581,706 |  |  | 1,733,108 |  |  | 11.7 |
Total |  | $ | 14,010,604 |  |  | $ | 14,885,583 |  |  | 100.0 | %
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures | The following table presents the total gross unrealized losses for the 687 and 932 fixed maturity and equity securities as of March 31, 2015 and December 31, 2014, respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):
|  | March 31, 2015 |  | December 31, 2014
|  | Gross Unrealized Losses |  | % of Total |  | Gross Unrealized Losses |  | % of Total
Less than 20% |  | $ | 72,598 |  |  | 73.0 | % |  | $ | 111,965 |  |  | 83.0 | %
20% or more for less than six months |  | 15,318 |  |  | 15.4 |  |  | 13,698 |  |  | 10.1 |
20% or more for six months or greater |  | 11,546 |  |  | 11.6 |  |  | 9,256 |  |  | 6.9 |
Total |  | $ | 99,462 |  |  | 100.0 | % |  | $ | 134,919 |  |  | 100.0 | %
Fair Value And Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosures | The following tables present the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 687 and 932 fixed maturity and equity securities that have estimated fair values below amortized cost as of March 31, 2015 and December 31, 2014, respectively (dollars in thousands). These investments are presented by class and grade of security, as well as the length of time the related fair value has remained below amortized cost.
|  | Less than 12 months |  | 12 months or greater |  | Total
|  |  |  | Gross |  |  |  | Gross |  |  |  | Gross
March 31, 2015: |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized
|  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
Investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | $ | 805,091 |  |  | $ | 18,419 |  |  | $ | 227,150 |  |  | $ | 15,576 |  |  | $ | 1,032,241 |  |  | $ | 33,995 |
Residential mortgage-backed securities |  | 100,937 |  |  | 1,507 |  |  | 62,201 |  |  | 3,228 |  |  | 163,138 |  |  | 4,735 |
Asset-backed securities |  | 285,839 |  |  | 2,774 |  |  | 99,896 |  |  | 3,381 |  |  | 385,735 |  |  | 6,155 |
Commercial mortgage-backed securities |  | 49,304 |  |  | 162 |  |  | 20,733 |  |  | 1,590 |  |  | 70,037 |  |  | 1,752 |
State and political subdivisions |  | — |  |  | — |  |  | 13,647 |  |  | 3,128 |  |  | 13,647 |  |  | 3,128 |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 109,347 |  |  | 5,560 |  |  | 36,737 |  |  | 1,494 |  |  | 146,084 |  |  | 7,054 |
Total investment grade securities |  | 1,350,518 |  |  | 28,422 |  |  | 460,364 |  |  | 28,397 |  |  | 1,810,882 |  |  | 56,819 |
Below investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | 357,118 |  |  | 28,279 |  |  | 25,560 |  |  | 2,557 |  |  | 382,678 |  |  | 30,836 |
Residential mortgage-backed securities |  | 10,308 |  |  | 83 |  |  | 12,033 |  |  | 414 |  |  | 22,341 |  |  | 497 |
Asset-backed securities |  | 14,478 |  |  | 231 |  |  | 6,715 |  |  | 1,707 |  |  | 21,193 |  |  | 1,938 |
Commercial mortgage-backed securities |  | 6,739 |  |  | 240 |  |  | 5,522 |  |  | 5,410 |  |  | 12,261 |  |  | 5,650 |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 15,375 |  |  | 2,145 |  |  | 2,910 |  |  | 128 |  |  | 18,285 |  |  | 2,273 |
Total below investment grade securities |  | 404,018 |  |  | 30,978 |  |  | 52,740 |  |  | 10,216 |  |  | 456,758 |  |  | 41,194 |
Total fixed maturity securities |  | $ | 1,754,536 |  |  | $ | 59,400 |  |  | $ | 513,104 |  |  | $ | 38,613 |  |  | $ | 2,267,640 |  |  | $ | 98,013 |
Non-redeemable preferred stock |  | $ | 20,885 |  |  | $ | 501 |  |  | $ | 6,649 |  |  | $ | 904 |  |  | $ | 27,534 |  |  | $ | 1,405 |
Other equity securities |  | 8,597 |  |  | 44 |  |  | — |  |  | — |  |  | 8,597 |  |  | 44 |
Total equity securities |  | $ | 29,482 |  |  | $ | 545 |  |  | $ | 6,649 |  |  | $ | 904 |  |  | $ | 36,131 |  |  | $ | 1,449 |
|  | Less than 12 months |  | 12 months or greater |  | Total
|  |  |  | Gross |  |  |  | Gross |  |  |  | Gross
December 31, 2014: |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized
|  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
Investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | $ | 1,225,767 |  |  | $ | 27,784 |  |  | $ | 614,294 |  |  | $ | 30,040 |  |  | $ | 1,840,061 |  |  | $ | 57,824 |
Canadian and Canadian provincial governments |  | — |  |  | — |  |  | 1,235 |  |  | 7 |  |  | 1,235 |  |  | 7 |
Residential mortgage-backed securities |  | 78,864 |  |  | 846 |  |  | 135,414 |  |  | 5,247 |  |  | 214,278 |  |  | 6,093 |
Asset-backed securities |  | 332,785 |  |  | 4,021 |  |  | 109,411 |  |  | 4,289 |  |  | 442,196 |  |  | 8,310 |
Commercial mortgage-backed securities |  | 78,632 |  |  | 564 |  |  | 28,375 |  |  | 2,461 |  |  | 107,007 |  |  | 3,025 |
U.S. government and agencies |  | 81,317 |  |  | 89 |  |  | 32,959 |  |  | 426 |  |  | 114,276 |  |  | 515 |
State and political subdivisions |  | 13,780 |  |  | 17 |  |  | 18,998 |  |  | 3,438 |  |  | 32,778 |  |  | 3,455 |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 156,725 |  |  | 7,007 |  |  | 76,111 |  |  | 2,946 |  |  | 232,836 |  |  | 9,953 |
Total investment grade securities |  | 1,967,870 |  |  | 40,328 |  |  | 1,016,797 |  |  | 48,854 |  |  | 2,984,667 |  |  | 89,182 |
Below investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | 415,886 |  |  | 29,316 |  |  | 32,567 |  |  | 3,404 |  |  | 448,453 |  |  | 32,720 |
Residential mortgage-backed securities |  | 22,836 |  |  | 293 |  |  | 6,284 |  |  | 225 |  |  | 29,120 |  |  | 518 |
Asset-backed securities |  | 12,448 |  |  | 274 |  |  | 7,108 |  |  | 1,791 |  |  | 19,556 |  |  | 2,065 |
Commercial mortgage-backed securities |  | 3,288 |  |  | 249 |  |  | 5,580 |  |  | 5,385 |  |  | 8,868 |  |  | 5,634 |
State and political subdivisions |  | 964 |  |  | 43 |  |  | — |  |  | — |  |  | 964 |  |  | 43 |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 13,986 |  |  | 3,136 |  |  | — |  |  | — |  |  | 13,986 |  |  | 3,136 |
Total below investment grade securities |  | 469,408 |  |  | 33,311 |  |  | 51,539 |  |  | 10,805 |  |  | 520,947 |  |  | 44,116 |
Total fixed maturity securities |  | $ | 2,437,278 |  |  | $ | 73,639 |  |  | $ | 1,068,336 |  |  | $ | 59,659 |  |  | $ | 3,505,614 |  |  | $ | 133,298 |
Non-redeemable preferred stock |  | $ | 11,619 |  |  | $ | 235 |  |  | $ | 19,100 |  |  | $ | 1,292 |  |  | $ | 30,719 |  |  | $ | 1,527 |
Other equity securities |  | — |  |  | — |  |  | 3,545 |  |  | 94 |  |  | 3,545 |  |  | 94 |
Total equity securities |  | $ | 11,619 |  |  | $ | 235 |  |  | $ | 22,645 |  |  | $ | 1,386 |  |  | $ | 34,264 |  |  | $ | 1,621 |
Investment Income | Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):
|  | Three months ended March 31,
|  | 2015 |  | 2014
Fixed maturity securities available-for-sale |  | $ | 269,768 |  |  | $ | 243,962 |
Mortgage loans on real estate |  | 34,772 |  |  | 33,092 |
Policy loans |  | 14,040 |  |  | 13,438 |
Funds withheld at interest |  | 112,260 |  |  | 112,739 |
Short-term investments |  | 695 |  |  | 965 |
Other invested assets |  | 12,027 |  |  | 14,501 |
Investment income |  | 443,562 |  |  | 418,697 |
Investment expense |  | (16,671 | ) |  | (14,322 | )
Investment income, net of related expenses |  | $ | 426,891 |  |  | $ | 404,375 |
Gain Loss On Investments | Investment related gains (losses), net consist of the following (dollars in thousands):
| Three months ended March 31,
| 2015 |  | 2014
Fixed maturity and equity securities available for sale: |  |  |
Other-than-temporary impairment losses on fixed maturity securities recognized in earnings | $ | (2,527 | ) |  | $ | (303 | )
Gain on investment activity | 19,201 |  |  | 8,067 |
Loss on investment activity | (13,596 | ) |  | (6,583 | )
Other impairment losses and change in mortgage loan provision | (4,168 | ) |  | 1,664 |
Derivatives and other, net | 8,673 |  |  | 81,726 |
Total investment related gains (losses), net | $ | 7,583 |  |  | $ | 84,571 |
Schedule of Repurchase Agreements [Table Text Block] | The following table includes the amount of borrowed securities, repurchased securities pledged and repurchased/reverse repurchased securities pledged and received as of March 31, 2015 and December 31, 2014 (dollars in thousands).
| March 31, 2015 |  | December 31, 2014
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Borrowed securities | $ | 193,840 |  |  | $ | 207,476 |  |  | $ | 201,050 |  |  | $ | 212,946 |
Repurchase program securities pledged | 91,875 |  |  | 108,268 |  |  | 92,446 |  |  | 107,158 |
Repurchase program/reverse repurchase program: |  |  |  |  |  |  |
Securities pledged | 298,625 |  |  | 317,368 |  |  | 298,466 |  |  | 314,160 |
Securities received | n/a |  |  | 346,560 |  |  | n/a |  |  | 338,929 |
Disclosure Of Real Estate Holdings By Property Type [Table Text Block] | The distribution of mortgage loans, gross of valuation allowances, by property type is as follows as of March 31, 2015 and December 31, 2014 (dollars in thousands):
|  | March 31, 2015 |  | December 31, 2014
Property type: |  | Recorded Investment |  | % of Total |  | Recorded Investment |  | % of Total
Office building |  | $ | 937,939 |  |  | 32.2 | % |  | $ | 851,749 |  |  | 31.3 | %
Retail |  | 890,080 |  |  | 30.5 |  |  | 802,466 |  |  | 29.6 |
Industrial |  | 474,310 |  |  | 16.2 |  |  | 466,583 |  |  | 17.2 |
Apartment |  | 404,174 |  |  | 13.8 |  |  | 376,430 |  |  | 13.8 |
Other commercial |  | 213,113 |  |  | 7.3 |  |  | 221,481 |  |  | 8.1 |
Total |  | $ | 2,919,616 |  |  | 100.0 | % |  | $ | 2,718,709 |  |  | 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, 2015 and December 31, 2014 are as follows (dollars in thousands):
|  | March 31, 2015 |  | December 31, 2014
|  | Recorded Investment |  | % of Total |  | Recorded Investment |  | % of Total
Due within five years |  | $ | 923,234 |  |  | 31.6 | % |  | $ | 860,362 |  |  | 31.6 | %
Due after five years through ten years |  | 1,263,984 |  |  | 43.3 |  |  | 1,165,530 |  |  | 42.9 |
Due after ten years |  | 732,398 |  |  | 25.1 |  |  | 692,817 |  |  | 25.5 |
Total |  | $ | 2,919,616 |  |  | 100.0 | % |  | $ | 2,718,709 |  |  | 100.0 | %
Mortgage Loan Internal Credit Risk Grade [Table Text Block] | Information regarding the Company’s credit quality indicators, as determined by the Company's internal evaluation methodology for its recorded investment in mortgage loans, gross of valuation allowances, as of March 31, 2015 and December 31, 2014 is as follows (dollars in thousands):
|  | March 31, 2015 |  | December 31, 2014
Internal credit quality grade: |  | Recorded Investment |  | % of Total |  | Recorded Investment |  | % of Total
High investment grade |  | $ | 1,404,166 |  |  | 48.0 | % |  | $ | 1,326,199 |  |  | 48.8 | %
Investment grade |  | 1,377,802 |  |  | 47.2 |  |  | 1,235,046 |  |  | 45.4 |
Average |  | 98,531 |  |  | 3.4 |  |  | 118,152 |  |  | 4.4 |
Watch list |  | 22,161 |  |  | 0.8 |  |  | 22,285 |  |  | 0.8 |
In or near default |  | 16,956 |  |  | 0.6 |  |  | 17,027 |  |  | 0.6 |
Total |  | $ | 2,919,616 |  |  | 100.0 | % |  | $ | 2,718,709 |  |  | 100.0 | %
Recorded Investment And Allowance For Credit Losses | The following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances as of March 31, 2015 and December 31, 2014 (dollars in thousands):
|  | March 31, 2015 |  | December 31, 2014
Mortgage loans: |  |  |  |
Individually measured for impairment |  | $ | 16,956 |  |  | $ | 17,027 |
Collectively measured for impairment |  | 2,902,660 |  |  | 2,701,682 |
Mortgage loans, gross of valuation allowances |  | 2,919,616 |  |  | 2,718,709 |
Valuation allowances: |  |  |  |
Individually measured for impairment |  | 713 |  |  | 816 |
Collectively measured for impairment |  | 5,417 |  |  | 5,655 |
Total valuation allowances |  | 6,130 |  |  | 6,471 |
Mortgage loans, net of valuation allowances |  | $ | 2,913,486 |  |  | $ | 2,712,238 |
Allowance For Mortgage Loan And Lease Losses Provision For Loss Net | Information regarding the Company’s loan valuation allowances for mortgage loans for the three months ended March 31, 2015 and 2014 is as follows (dollars in thousands):
|  | Three months ended March 31,
|  | 2015 |  | 2014
Balance, beginning of period |  | $ | 6,471 |  |  | $ | 10,106 |
Charge-offs, net of recoveries |  | — |  |  | 24 |
Provision (release) |  | (341 | ) |  | (1,664 | )
Balance, end of period |  | $ | 6,130 |  |  | $ | 8,466 |
Impaired Financing Receivables Table | Information regarding the portion of the Company’s mortgage loans that were impaired as of March 31, 2015 and December 31, 2014 is as follows (dollars in thousands):
|  | Unpaid Principal Balance |  | Recorded Investment |  | Related Allowance |  | Carrying Value
March 31, 2015: |  |  |  |  |  |  |  |
Impaired mortgage loans with no valuation allowance recorded |  | $ | 7,296 |  |  | $ | 6,693 |  |  | $ | — |  |  | $ | 6,693 |
Impaired mortgage loans with valuation allowance recorded |  | 10,227 |  |  | 10,263 |  |  | 713 |  |  | 9,550 |
Total impaired mortgage loans |  | $ | 17,523 |  |  | $ | 16,956 |  |  | $ | 713 |  |  | $ | 16,243 |
December 31, 2014: |  |  |  |  |  |  |  |
Impaired mortgage loans with no valuation allowance recorded |  | $ | 7,314 |  |  | $ | 6,711 |  |  | $ | — |  |  | $ | 6,711 |
Impaired mortgage loans with valuation allowance recorded |  | 10,279 |  |  | 10,316 |  |  | 816 |  |  | 9,500 |
Total impaired mortgage loans |  | $ | 17,593 |  |  | $ | 17,027 |  |  | $ | 816 |  |  | $ | 16,211 |
The Company’s average investment in impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands):
|  | Three months ended March 31,
|  | 2015 |  | 2014
|  | Average Recorded Investment(1) |  | Interest Income |  | Average Recorded Investment(1) |  | Interest Income
Impaired mortgage loans with no valuation allowance recorded |  | $ | 10,290 |  |  | $ | 106 |  |  | $ | 14,539 |  |  | $ | 318 |
Impaired mortgage loans with valuation allowance recorded |  | 6,702 |  |  | 155 |  |  | 20,554 |  |  | 193 |
Total impaired mortgage loans |  | $ | 16,992 |  |  | $ | 261 |  |  | $ | 35,093 |  |  | $ | 511 |
(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] | Carrying values of these assets as of March 31, 2015 and December 31, 2014 are as follows (dollars in thousands):
|  | March 31, 2015 |  | December 31, 2014
Equity securities |  | $ | 134,619 |  |  | $ | 126,860 |
Limited partnerships and real estate joint ventures |  | 450,842 |  |  | 446,604 |
Structured loans |  | 148,377 |  |  | 164,309 |
Derivatives |  | 265,020 |  |  | 216,966 |
FVO contractholder-directed unit-linked investments |  | 136,597 |  |  | 140,344 |
Other |  | 107,578 |  |  | 103,236 |
Total other invested assets |  | $ | 1,243,033 |  |  | $ | 1,198,319 |

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