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Investments (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments [Abstract] |
Available-for-sale Securities [Table Text Block] | The following tables provide information relating to investments in fixed maturity and equity securities by sector as of December 31, 2015 and 2014 (dollars in thousands):
December 31, 2015: |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value |  | % of Total |  | Other-than- temporary impairments in AOCI
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | $ | 17,575,507 |  |  | $ | 599,718 |  |  | $ | 467,069 |  |  | $ | 17,708,156 |  |  | 59.7 | % |  | $ | — |
Canadian and Canadian provincial governments |  | 2,469,009 |  |  | 1,110,282 |  |  | 2,532 |  |  | 3,576,759 |  |  | 12.1 |  |  | — |
Residential mortgage-backed securities |  | 1,277,998 |  |  | 45,152 |  |  | 11,673 |  |  | 1,311,477 |  |  | 4.4 |  |  | (300 | )
Asset-backed securities |  | 1,219,000 |  |  | 12,052 |  |  | 18,376 |  |  | 1,212,676 |  |  | 4.1 |  |  | 354 |
Commercial mortgage-backed securities |  | 1,456,848 |  |  | 37,407 |  |  | 11,168 |  |  | 1,483,087 |  |  | 5.0 |  |  | (1,609 | )
U.S. government and agencies |  | 1,423,791 |  |  | 15,586 |  |  | 57,718 |  |  | 1,381,659 |  |  | 4.7 |  |  | — |
State and political subdivisions |  | 480,067 |  |  | 40,014 |  |  | 9,067 |  |  | 511,014 |  |  | 1.7 |  |  | — |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 2,420,757 |  |  | 78,964 |  |  | 41,644 |  |  | 2,458,077 |  |  | 8.3 |  |  | — |
Total fixed maturity securities |  | $ | 28,322,977 |  |  | $ | 1,939,175 |  |  | $ | 619,247 |  |  | $ | 29,642,905 |  |  | 100.0 | % |  | $ | (1,555 | )
Non-redeemable preferred stock |  | $ | 85,645 |  |  | $ | 7,837 |  |  | $ | 5,962 |  |  | $ | 87,520 |  |  | 69.5 | % |  |
Other equity securities |  | 40,584 |  |  | — |  |  | 2,242 |  |  | 38,342 |  |  | 30.5 |  |  |
Total equity securities |  | $ | 126,229 |  |  | $ | 7,837 |  |  | $ | 8,204 |  |  | $ | 125,862 |  |  | 100.0 | % |  |
December 31, 2014: |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value |  | % of Total |  | Other-than- temporary impairments 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 December 31, 2015 and 2014 (dollars in thousands):
| 2015 |  | 2014
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Fixed maturity securities pledged as collateral | $ | 169,678 |  |  | $ | 176,782 |  |  | $ | 127,229 |  |  | $ | 134,863 |
Fixed maturity securities received as collateral | n/a |  |  | 242,914 |  |  | n/a |  |  | 117,227 |
Securities held in trust | 10,535,729 |  |  | 10,928,393 |  |  | 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 included securities of the U.S. government and its agencies as of December 31, 2015, as well as the securities disclosed below as of December 31, 2015 and 2014 (dollars in thousands).
| 2015 |  | 2014
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Fixed maturity securities guaranteed or issued by: |  |  |  |  |  |  |
Canadian province of Ontario | $ | 864,444 |  |  | $ | 1,199,080 |  |  | $ | 979,908 |  |  | $ | 1,359,339 |
Canadian province of Quebec | 943,484 |  |  | 1,525,903 |  |  | 1,006,315 |  |  | 1,599,673 |
Investments Classified By Contractual Maturity Date [Table Text Block] | 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 |  | $ | 731,706 |  |  | $ | 739,485 |
Due after one year through five years |  | 5,615,811 |  |  | 5,763,489 |
Due after five years through ten years |  | 8,290,362 |  |  | 8,408,708 |
Due after ten years |  | 9,731,252 |  |  | 10,723,983 |
Asset and mortgage-backed securities |  | 3,953,846 |  |  | 4,007,240 |
Total |  | $ | 28,322,977 |  |  | $ | 29,642,905 |
Fixed Maturity Holdings Industry Types [Table Text Block] | The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of December 31, 2015 and 2014 (dollars in thousands):
December 31, 2015: |  | Amortized Cost |  | Estimated Fair Value |  | % of Total
Finance |  | $ | 5,408,791 |  |  | $ | 5,555,044 |  |  | 31.4 | %
Industrial |  | 10,211,426 |  |  | 10,129,917 |  |  | 57.2 |
Utility |  | 1,955,290 |  |  | 2,023,195 |  |  | 11.4 |
Total |  | $ | 17,575,507 |  |  | $ | 17,708,156 |  |  | 100.0 | %
December 31, 2014: |  | Amortized Cost |  | Estimated 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 | %
Roll Forward Of Cumulative Credit Loss Component Of Otti Income Loss [Table Text Block] | The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts (dollars in thousands):
|  | 2015 |  | 2014 |  | 2013
Balance, beginning of period |  | $ | 7,284 |  |  | $ | 11,696 |  |  | $ | 16,675 |
Additional impairments - credit loss OTTI recognized on securities previously impaired |  | — |  |  | — |  |  | 134 |
Credit loss OTTI previously recognized on securities impaired to fair value during the period |  | — |  |  | — |  |  | (1,449 | )
Credit loss previously recognized on securities which matured, paid down, prepaid or were sold during the period |  | — |  |  | (4,412 | ) |  | (3,664 | )
Balance, end of period |  | $ | 7,284 |  |  | $ | 7,284 |  |  | $ | 11,696 |
AccountingForCertainLoansAndDebtSecuritiesAcquiredInTransferDisclosureTextBlock | The following tables present information on the Company’s purchased credit impaired securities, which are included in fixed maturity securities available-for-sale as of December 31, 2015 and 2014 (dollars in thousands):
| 2015 |  | 2014
Outstanding principal and interest balance(1) | $ | 343,640 |  |  | $ | 226,121 |
Carrying value, including accrued interest(2) | $ | 287,663 |  |  | $ | 185,842 |
(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] | The following table presents information about purchased credit impaired investments acquired during the periods ended December 31, 2015 and 2014, as of the acquisition dates (dollars in thousands).
| 2015 |  | 2014
Contractually required payments (including interest) | $ | 217,187 |  |  | $ | 96,617 |
Cash flows expected to be collected(1) | $ | 179,025 |  |  | $ | 76,551 |
Fair value of investments acquired | $ | 137,399 |  |  | $ | 53,950 |
(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] | The following table presents activity for the accretable yield on purchased credit impaired securities for the years ended December 31, 2015 and 2014 (dollars in thousands):
| 2015 |  | 2014
Balance, beginning of period | $ | 67,171 |  |  | $ | 69,469 |
Investments purchased | 41,626 |  |  | 22,601 |
Accretion | (11,402 | ) |  | (9,339 | )
Disposals | (1,109 | ) |  | (379 | )
Reclassification from nonaccretable difference | (8,270 | ) |  | (15,181 | )
Balance, end of period | $ | 88,016 |  |  | $ | 67,171 |
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures [Table Text Block] | The following table presents the total gross unrealized losses for the 2,080 and 932 fixed maturity and equity securities at December 31, 2015 and 2014, respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):
|  | 2015 |  | 2014
|  | Gross Unrealized Losses |  | % of Total |  | Gross Unrealized Losses |  | % of Total
Less than 20% |  | $ | 463,109 |  |  | 73.8 | % |  | $ | 111,965 |  |  | 83.0 | %
20% or more for less than six months |  | 142,495 |  |  | 22.7 |  |  | 13,698 |  |  | 10.1 |
20% or more for six months or greater |  | 21,847 |  |  | 3.5 |  |  | 9,256 |  |  | 6.9 |
Total |  | $ | 627,451 |  |  | 100.0 | % |  | $ | 134,919 |  |  | 100.0 | %
Fair Value And Investments In Debt And Equity Securities Disclosures [Table Text Block] | 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
December 31, 2015: |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
Investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | $ | 6,388,148 |  |  | $ | 323,961 |  |  | $ | 294,755 |  |  | $ | 40,861 |  |  | $ | 6,682,903 |  |  | $ | 364,822 |
Canadian and Canadian provincial governments |  | 122,746 |  |  | 2,532 |  |  | — |  |  | — |  |  | 122,746 |  |  | 2,532 |
Residential mortgage-backed securities |  | 452,297 |  |  | 7,036 |  |  | 82,314 |  |  | 4,057 |  |  | 534,611 |  |  | 11,093 |
Asset-backed securities |  | 581,701 |  |  | 9,825 |  |  | 199,298 |  |  | 7,100 |  |  | 780,999 |  |  | 16,925 |
Commercial mortgage-backed securities |  | 514,877 |  |  | 9,806 |  |  | 31,177 |  |  | 997 |  |  | 546,054 |  |  | 10,803 |
U.S. government and agencies |  | 1,010,387 |  |  | 57,718 |  |  | — |  |  | — |  |  | 1,010,387 |  |  | 57,718 |
State and political subdivisions |  | 157,837 |  |  | 5,349 |  |  | 13,016 |  |  | 3,718 |  |  | 170,853 |  |  | 9,067 |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 702,962 |  |  | 18,279 |  |  | 38,379 |  |  | 4,206 |  |  | 741,341 |  |  | 22,485 |
Total investment grade securities |  | 9,930,955 |  |  | 434,506 |  |  | 658,939 |  |  | 60,939 |  |  | 10,589,894 |  |  | 495,445 |
Below investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | 554,688 |  |  | 71,171 |  |  | 114,427 |  |  | 31,076 |  |  | 669,115 |  |  | 102,247 |
Residential mortgage-backed securities |  | 22,646 |  |  | 282 |  |  | 7,679 |  |  | 298 |  |  | 30,325 |  |  | 580 |
Asset-backed securities |  | 6,772 |  |  | 201 |  |  | 9,335 |  |  | 1,250 |  |  | 16,107 |  |  | 1,451 |
Commercial mortgage-backed securities |  | 3,253 |  |  | 248 |  |  | 767 |  |  | 117 |  |  | 4,020 |  |  | 365 |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 60,668 |  |  | 7,356 |  |  | 31,693 |  |  | 11,803 |  |  | 92,361 |  |  | 19,159 |
Total below investment grade securities |  | 648,027 |  |  | 79,258 |  |  | 163,901 |  |  | 44,544 |  |  | 811,928 |  |  | 123,802 |
Total fixed maturity securities |  | $ | 10,578,982 |  |  | $ | 513,764 |  |  | $ | 822,840 |  |  | $ | 105,483 |  |  | $ | 11,401,822 |  |  | $ | 619,247 |
Non-redeemable preferred stock |  | $ | 12,331 |  |  | $ | 2,175 |  |  | $ | 12,191 |  |  | $ | 3,787 |  |  | $ | 24,522 |  |  | $ | 5,962 |
Other equity securities |  | 38,327 |  |  | 2,242 |  |  | — |  |  | — |  |  | 38,327 |  |  | 2,242 |
Total equity securities |  | $ | 50,658 |  |  | $ | 4,417 |  |  | $ | 12,191 |  |  | $ | 3,787 |  |  | $ | 62,849 |  |  | $ | 8,204 |
|  | Less than 12 months |  | 12 months or greater |  | Total
December 31, 2014: |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized 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 [Table Text Block] | Major categories of investment income, net of related expenses consist of the following (dollars in thousands):
|  | 2015 |  | 2014 |  | 2013
Fixed maturity securities available-for-sale |  | $ | 1,177,706 |  |  | $ | 1,052,715 |  |  | $ | 966,759 |
Mortgage loans on real estate |  | 149,564 |  |  | 148,417 |  |  | 121,476 |
Policy loans |  | 62,955 |  |  | 55,248 |  |  | 57,099 |
Funds withheld at interest |  | 343,031 |  |  | 447,364 |  |  | 545,550 |
Short-term investments |  | 2,567 |  |  | 2,118 |  |  | 2,236 |
Other invested assets |  | 66,716 |  |  | 70,149 |  |  | 58,771 |
Investment income |  | 1,802,539 |  |  | 1,776,011 |  |  | 1,751,891 |
Investment expense |  | (68,044 | ) |  | (62,320 | ) |  | (52,026 | )
Investment income, net of related expenses |  | $ | 1,734,495 |  |  | $ | 1,713,691 |  |  | $ | 1,699,865 |
Gain (Loss) on Investments [Table Text Block] | Investment related gains (losses), net, consist of the following (dollars in thousands):
|  | 2015 |  | 2014 |  | 2013
Fixed maturity and equity securities available for sale: |  |  |  |  |  |
Other-than-temporary impairment losses on fixed maturity securities recognized in earnings |  | $ | (57,380 | ) |  | $ | (7,766 | ) |  | $ | (12,901 | )
Gain on investment activity |  | 73,079 |  |  | 65,435 |  |  | 82,744 |
Loss on investment activity |  | (71,893 | ) |  | (31,295 | ) |  | (60,575 | )
Other impairment losses and change in mortgage loan provision |  | (6,953 | ) |  | (5,315 | ) |  | (6,933 | )
Derivatives and other, net |  | (101,603 | ) |  | 165,134 |  |  | 61,655 |
Total investment related gains (losses), net |  | $ | (164,750 | ) |  | $ | 186,193 |  |  | $ | 63,990 |
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 December 31, 2015 and 2014 (dollars in thousands).
| 2015 |  | 2014
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Borrowed securities | $ | 259,540 |  |  | $ | 266,297 |  |  | $ | 201,050 |  |  | $ | 212,946 |
Repurchase program securities pledged | — |  |  | — |  |  | 92,446 |  |  | 107,158 |
Repurchase program/reverse repurchase program: |  |  |  |  |  |  |
Securities pledged | 443,435 |  |  | 465,889 |  |  | 298,466 |  |  | 314,160 |
Securities received | n/a |  |  | 481,197 |  |  | n/a |  |  | 338,929 |
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block] | The following table presents information on the securities pledged as collateral by the Company related to its repurchase/reverse repurchase program as of December 31, 2015 (dollars in thousands). Collateral associated with certain borrowed securities is not included within the table as the collateral pledged to each counterparty is the right to reinsurance treaty cash flows.
| December 31, 2015
| Remaining Contractual Maturity of the Agreements
| Overnight and Continuous |  | Up to 30 Days |  | 30-90 Days |  | Greater than 90 Days |  | Total
Collateral on repurchase program |  |  |  |  |  |  |  |  |
Corporate securities | $ | — |  |  | $ | 2,951 |  |  | $ | — |  |  | $ | 147,324 |  |  | $ | 150,275 |
Residential mortgage-backed securities | — |  |  | — |  |  | — |  |  | 97,639 |  |  | 97,639 |
U.S. government and agencies | — |  |  | — |  |  | — |  |  | 199,431 |  |  | 199,431 |
Foreign government | — |  |  | — |  |  | — |  |  | 3,358 |  |  | 3,358 |
Other | 15,186 |  |  | — |  |  | — |  |  | — |  |  | 15,186 |
Total borrowings | $ | 15,186 |  |  | $ | 2,951 |  |  | $ | — |  |  | $ | 447,752 |  |  | $ | 465,889 |
Gross amount of recognized liabilities for repurchase agreement in preceding table |  | $ | 481,197 |
Amounts related to agreements not included in offsetting disclosure |  | $ | 15,308 |
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 December 31, 2015 and 2014 (dollars in thousands):
|  | 2015 |  | 2014
|  | Recorded Investment |  | Percentage of Total |  | Recorded Investment |  | Percentage of Total
Property type: |  |  |  |  |  |  |  |
Office building |  | $ | 980,858 |  |  | 31.3 | % |  | $ | 851,749 |  |  | 31.3 | %
Retail |  | 1,026,018 |  |  | 32.7 |  |  | 802,466 |  |  | 29.6 |
Industrial |  | 527,485 |  |  | 16.8 |  |  | 466,583 |  |  | 17.2 |
Apartment |  | 420,014 |  |  | 13.4 |  |  | 376,430 |  |  | 13.8 |
Other commercial |  | 182,389 |  |  | 5.8 |  |  | 221,481 |  |  | 8.1 |
Total |  | $ | 3,136,764 |  |  | 100.0 | % |  | $ | 2,718,709 |  |  | 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, 2015 and 2014 are as follows (dollars in thousands):
|  | 2015 |  | 2014
|  | Recorded Investment |  | % of Total |  | Recorded Investment |  | % of Total
Due within five years |  | $ | 873,280 |  |  | 27.8 | % |  | $ | 860,362 |  |  | 31.6 | %
Due after five years through ten years |  | 1,561,535 |  |  | 49.8 |  |  | 1,165,530 |  |  | 42.9 |
Due after ten years |  | 701,949 |  |  | 22.4 |  |  | 692,817 |  |  | 25.5 |
Total |  | $ | 3,136,764 |  |  | 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 December 31, 2015 and 2014 are as follows (dollars in thousands):
|  | 2015 |  | 2014
Internal credit quality grade: |  | Recorded Investment |  | % of Total |  | Recorded Investment |  | % of Total
High investment grade |  | $ | 1,621,601 |  |  | 51.7 | % |  | $ | 1,326,199 |  |  | 48.8 | %
Investment grade |  | 1,397,996 |  |  | 44.6 |  |  | 1,235,046 |  |  | 45.4 |
Average |  | 87,196 |  |  | 2.8 |  |  | 118,152 |  |  | 4.4 |
Watch list |  | 13,550 |  |  | 0.4 |  |  | 22,285 |  |  | 0.8 |
In or near default |  | 16,421 |  |  | 0.5 |  |  | 17,027 |  |  | 0.6 |
Total |  | $ | 3,136,764 |  |  | 100.0 | % |  | $ | 2,718,709 |  |  | 100.0 | %
Recorded Investment And Allowance For Credit Losses [Table Text Block] | The following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances, as of December 31, 2015 and 2014 (dollars in thousands):
|  | 2015 |  | 2014
Mortgage loans: |  |  |  |
Individually measured for impairment |  | $ | 16,421 |  |  | $ | 17,027 |
Collectively measured for impairment |  | 3,120,343 |  |  | 2,701,682 |
Mortgage loans, gross of valuation allowances |  | 3,136,764 |  |  | 2,718,709 |
Valuation allowances: |  |  |  |
Individually measured for impairment |  | 588 |  |  | 816 |
Collectively measured for impairment |  | 6,225 |  |  | 5,655 |
Total valuation allowances |  | 6,813 |  |  | 6,471 |
Mortgage loans, net of valuation allowances |  | $ | 3,129,951 |  |  | $ | 2,712,238 |
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, 2015, 2014 and 2013 are as follows (dollars in thousands):
|  | 2015 |  | 2014 |  | 2013
Balance, beginning of period |  | $ | 6,471 |  |  | $ | 10,106 |  |  | $ | 11,580 |
Charge-offs, net of recoveries |  | — |  |  | (2,731 | ) |  | (3,431 | )
Provision |  | 342 |  |  | (904 | ) |  | 1,957 |
Balance, end of period |  | $ | 6,813 |  |  | $ | 6,471 |  |  | $ | 10,106 |
Impaired Financing Receivables [Table Text Block] | Information regarding the portion of the Company’s mortgage loans that were impaired as of December 31, 2015 and 2014 is as follows (dollars in thousands):
|  | Unpaid Principal Balance |  | Recorded Investment |  | Related Allowance |  | Carrying Value
December 31, 2015: |  |  |  |  |  |
Impaired mortgage loans with no valuation allowance recorded |  | $ | 4,033 |  |  | $ | 4,033 |  |  | $ | — |  |  | $ | 4,033 |
Impaired mortgage loans with valuation allowance recorded |  | 12,898 |  |  | 12,388 |  |  | 588 |  |  | 11,800 |
Total impaired mortgage loans |  | $ | 16,931 |  |  | $ | 16,421 |  |  | $ | 588 |  |  | $ | 15,833 |
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 balance of impaired mortgage loans and the related interest income are reflected in the table below for the years ended December 31, 2015, 2014 and 2013 (dollars in thousands):
|  | 2015 |  | 2014 |  | 2013
|  | Average Investment(1) |  | Interest Income |  | Average Investment(1) |  | Interest Income |  | Average Investment(1) |  | Interest Income
Impaired mortgage loans with no valuation allowance recorded |  | $ | 6,033 |  |  | $ | 330 |  |  | $ | 13,227 |  |  | $ | 647 |  |  | $ | 15,023 |  |  | $ | 852 |
Impaired mortgage loans with valuation allowance recorded |  | 11,592 |  |  | 770 |  |  | 13,827 |  |  | 637 |  |  | 22,818 |  |  | 951 |
Total |  | $ | 17,625 |  |  | $ | 1,100 |  |  | $ | 27,054 |  |  | $ | 1,284 |  |  | $ | 37,841 |  |  | $ | 1,803 |
(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 Assets [Table Text Block] | Other invested assets represented approximately 3.1% and 3.3% of the Company’s total investments as of December 31, 2015 and 2014, respectively. Carrying values of these assets as of December 31, 2015 and 2014 are as follows (dollars in thousands):
|  | 2015 |  | 2014
Equity securities |  | $ | 125,862 |  |  | $ | 126,860 |
Limited partnerships and real estate joint ventures |  | 567,697 |  |  | 446,604 |
Structured loans |  | 45,422 |  |  | 164,309 |
Derivatives |  | 256,178 |  |  | 216,966 |
FVO contractholder-directed unit-linked investments |  | 197,547 |  |  | 140,344 |
Other |  | 105,414 |  |  | 103,236 |
Total other invested assets |  | $ | 1,298,120 |  |  | $ | 1,198,319 |

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