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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015 (dollars in thousands):
December 31, 2016: |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value |  | % of Total |  | Other-than- temporary impairments in AOCI
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | $ | 18,924,711 |  |  | $ | 911,618 |  |  | $ | 217,245 |  |  | $ | 19,619,084 |  |  | 61.1 | % |  | $ | — |
Canadian and Canadian provincial governments |  | 2,561,605 |  |  | 1,085,982 |  |  | 3,541 |  |  | 3,644,046 |  |  | 11.4 |  |  | — |
Residential mortgage-backed securities |  | 1,258,039 |  |  | 33,917 |  |  | 13,380 |  |  | 1,278,576 |  |  | 4.0 |  |  | (375 | )
Asset-backed securities |  | 1,443,822 |  |  | 9,350 |  |  | 23,828 |  |  | 1,429,344 |  |  | 4.5 |  |  | 275 |
Commercial mortgage-backed securities |  | 1,342,440 |  |  | 28,973 |  |  | 7,759 |  |  | 1,363,654 |  |  | 4.2 |  |  | — |
U.S. government and agencies |  | 1,518,702 |  |  | 12,644 |  |  | 63,044 |  |  | 1,468,302 |  |  | 4.6 |  |  | — |
State and political subdivisions |  | 566,761 |  |  | 37,499 |  |  | 12,464 |  |  | 591,796 |  |  | 1.8 |  |  | — |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 2,595,707 |  |  | 123,054 |  |  | 19,938 |  |  | 2,698,823 |  |  | 8.4 |  |  | — |
Total fixed maturity securities |  | $ | 30,211,787 |  |  | $ | 2,243,037 |  |  | $ | 361,199 |  |  | $ | 32,093,625 |  |  | 100.0 | % |  | $ | (100 | )
Non-redeemable preferred stock |  | $ | 55,812 |  |  | $ | 1,648 |  |  | $ | 6,337 |  |  | $ | 51,123 |  |  | 18.6 | % |  |
Other equity securities |  | 229,767 |  |  | 1,792 |  |  | 7,321 |  |  | 224,238 |  |  | 81.4 |  |  |
Total equity securities |  | $ | 285,579 |  |  | $ | 3,440 |  |  | $ | 13,658 |  |  | $ | 275,361 |  |  | 100.0 | % |  |
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 | % |  |
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 derivative transactions and certain third-party reinsurance treaties as of December 31, 2016 and 2015 (dollars in thousands):
| 2016 |  | 2015
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Fixed maturity securities pledged as collateral | $ | 207,066 |  |  | $ | 210,676 |  |  | $ | 169,678 |  |  | $ | 176,782 |
Fixed maturity securities received as collateral | n/a |  |  | 300,925 |  |  | n/a |  |  | 242,914 |
Assets in trust held to satisfy collateral requirements | 12,135,258 |  |  | 12,874,370 |  |  | 10,535,729 |  |  | 10,928,393 |
Concentration Risk Disclosure [Text Block] | The Company’s exposure to concentrations of credit risk from single issuers greater than 10% of the Company’s stockholders’ equity included securities of the U.S. government and its agencies, as well as the securities disclosed below, as of December 31, 2016 and 2015 (dollars in thousands).
| 2016 |  | 2015
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Fixed maturity securities guaranteed or issued by: |  |  |  |  |  |  |
Canadian province of Quebec | $ | 1,004,261 |  |  | $ | 1,612,957 |  |  | $ | 943,484 |  |  | $ | 1,525,903 |
Canadian province of Ontario | 832,764 |  |  | 1,126,433 |  |  | 864,444 |  |  | 1,199,080 |
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 |  | $ | 791,302 |  |  | $ | 800,010 |
Due after one year through five years |  | 6,665,056 |  |  | 6,897,024 |
Due after five years through ten years |  | 9,042,167 |  |  | 9,390,938 |
Due after ten years |  | 9,668,961 |  |  | 10,934,079 |
Asset and mortgage-backed securities |  | 4,044,301 |  |  | 4,071,574 |
Total |  | $ | 30,211,787 |  |  | $ | 32,093,625 |
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, 2016 and 2015 (dollars in thousands):
December 31, 2016: |  | Amortized Cost |  | Estimated Fair Value |  | % of Total
Finance |  | $ | 6,725,199 |  |  | $ | 6,888,968 |  |  | 35.2 | %
Industrial |  | 10,228,813 |  |  | 10,639,613 |  |  | 54.2 |
Utility |  | 1,970,699 |  |  | 2,090,503 |  |  | 10.6 |
Total |  | $ | 18,924,711 |  |  | $ | 19,619,084 |  |  | 100.0 | %
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 | %
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):
|  | 2016 |  | 2015 |  | 2014
Balance, beginning of period |  | $ | 7,284 |  |  | $ | 7,284 |  |  | $ | 11,696 |
Additional impairments - credit loss OTTI recognized on securities previously impaired |  | 231 |  |  | — |  |  | — |
Credit loss previously recognized on securities which matured, paid down, prepaid or were sold during the period |  | (1,502 | ) |  | — |  |  | (4,412 | )
Balance, end of period |  | $ | 6,013 |  |  | $ | 7,284 |  |  | $ | 7,284 |
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, 2016 and 2015 (dollars in thousands):
| 2016 |  | 2015
Outstanding principal and interest balance(1) | $ | 85,078 |  |  | $ | 343,640 |
Carrying value, including accrued interest(2) | $ | 69,717 |  |  | $ | 287,663 |
(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, 2016 and 2015, as of the acquisition dates (dollars in thousands):
| 2016 |  | 2015
Contractually required payments (including interest) | $ | 7,310 |  |  | $ | 217,187 |
Cash flows expected to be collected(1) | $ | 5,748 |  |  | $ | 179,025 |
Fair value of investments acquired | $ | 4,139 |  |  | $ | 137,399 |
(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, 2016 and 2015 (dollars in thousands):
| 2016 |  | 2015
Balance, beginning of period | $ | 88,016 |  |  | $ | 67,171 |
Investments purchased | 1,609 |  |  | 41,626 |
Accretion | (9,004 | ) |  | (11,402 | )
Disposals | (59,078 | ) |  | (1,109 | )
Reclassification from nonaccretable difference | (2,105 | ) |  | (8,270 | )
Balance, end of period | $ | 19,438 |  |  | $ | 88,016 |
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures [Table Text Block] | The following table presents the total gross unrealized losses for the 1,535 and 2,080 fixed maturity and equity securities at December 31, 2016 and 2015, respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):
|  | 2016 |  | 2015
|  | Gross Unrealized Losses |  | % of Total |  | Gross Unrealized Losses |  | % of Total
Less than 20% |  | $ | 337,831 |  |  | 90.1 | % |  | $ | 463,109 |  |  | 73.8 | %
20% or more for less than six months |  | 19,438 |  |  | 5.2 |  |  | 142,495 |  |  | 22.7 |
20% or more for six months or greater |  | 17,588 |  |  | 4.7 |  |  | 21,847 |  |  | 3.5 |
Total |  | $ | 374,857 |  |  | 100.0 | % |  | $ | 627,451 |  |  | 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, 2016: |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
Investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | $ | 4,661,706 |  |  | $ | 124,444 |  |  | $ | 549,273 |  |  | $ | 43,282 |  |  | $ | 5,210,979 |  |  | $ | 167,726 |
Canadian and Canadian provincial governments |  | 101,578 |  |  | 3,541 |  |  | — |  |  | — |  |  | 101,578 |  |  | 3,541 |
Residential mortgage-backed securities |  | 490,473 |  |  | 9,733 |  |  | 112,216 |  |  | 3,635 |  |  | 602,689 |  |  | 13,368 |
Asset-backed securities |  | 563,259 |  |  | 12,010 |  |  | 257,166 |  |  | 9,653 |  |  | 820,425 |  |  | 21,663 |
Commercial mortgage-backed securities |  | 368,465 |  |  | 6,858 |  |  | 10,853 |  |  | 166 |  |  | 379,318 |  |  | 7,024 |
U.S. government and agencies |  | 1,056,101 |  |  | 63,044 |  |  | — |  |  | — |  |  | 1,056,101 |  |  | 63,044 |
State and political subdivisions |  | 187,194 |  |  | 9,396 |  |  | 13,635 |  |  | 3,068 |  |  | 200,829 |  |  | 12,464 |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 524,236 |  |  | 13,372 |  |  | 51,097 |  |  | 2,981 |  |  | 575,333 |  |  | 16,353 |
Total investment grade securities |  | 7,953,012 |  |  | 242,398 |  |  | 994,240 |  |  | 62,785 |  |  | 8,947,252 |  |  | 305,183 |
Below investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate securities |  | 330,757 |  |  | 7,914 |  |  | 163,152 |  |  | 41,605 |  |  | 493,909 |  |  | 49,519 |
Residential mortgage-backed securities |  | — |  |  | — |  |  | 412 |  |  | 12 |  |  | 412 |  |  | 12 |
Asset-backed securities |  | 5,904 |  |  | 700 |  |  | 12,581 |  |  | 1,465 |  |  | 18,485 |  |  | 2,165 |
Commercial mortgage-backed securities |  | 5,815 |  |  | 735 |  |  | — |  |  | — |  |  | 5,815 |  |  | 735 |
Other foreign government, supranational and foreign government-sponsored enterprises |  | 32,355 |  |  | 1,258 |  |  | 39,763 |  |  | 2,327 |  |  | 72,118 |  |  | 3,585 |
Total below investment grade securities |  | 374,831 |  |  | 10,607 |  |  | 215,908 |  |  | 45,409 |  |  | 590,739 |  |  | 56,016 |
Total fixed maturity securities |  | $ | 8,327,843 |  |  | $ | 253,005 |  |  | $ | 1,210,148 |  |  | $ | 108,194 |  |  | $ | 9,537,991 |  |  | $ | 361,199 |
Non-redeemable preferred stock |  | $ | 10,831 |  |  | $ | 831 |  |  | $ | 21,879 |  |  | $ | 5,506 |  |  | $ | 32,710 |  |  | $ | 6,337 |
Other equity securities |  | 202,068 |  |  | 7,020 |  |  | 6,751 |  |  | 301 |  |  | 208,819 |  |  | 7,321 |
Total equity securities |  | $ | 212,899 |  |  | $ | 7,851 |  |  | $ | 28,630 |  |  | $ | 5,807 |  |  | $ | 241,529 |  |  | $ | 13,658 |
|  | 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 |
Investment Income [Table Text Block] | Major categories of investment income, net of related expenses consist of the following (dollars in thousands):
|  | 2016 |  | 2015 |  | 2014
Fixed maturity securities available-for-sale |  | $ | 1,285,406 |  |  | $ | 1,177,706 |  |  | $ | 1,052,715 |
Mortgage loans on real estate |  | 168,582 |  |  | 149,564 |  |  | 148,417 |
Policy loans |  | 63,837 |  |  | 62,955 |  |  | 55,248 |
Funds withheld at interest |  | 368,728 |  |  | 343,031 |  |  | 447,364 |
Short-term investments and cash and cash equivalents |  | 8,051 |  |  | 7,574 |  |  | 8,955 |
Other |  | 89,371 |  |  | 61,709 |  |  | 63,312 |
Investment income |  | 1,983,975 |  |  | 1,802,539 |  |  | 1,776,011 |
Investment expense |  | (72,089 | ) |  | (68,044 | ) |  | (62,320 | )
Investment income, net of related expenses |  | $ | 1,911,886 |  |  | $ | 1,734,495 |  |  | $ | 1,713,691 |
Gain (Loss) on Investments [Table Text Block] | Investment related gains (losses), net, consist of the following (dollars in thousands):
|  | 2016 |  | 2015 |  | 2014
Fixed maturity and equity securities available for sale: |  |  |  |  |  |
Other-than-temporary impairment losses on fixed maturities |  | $ | (38,805 | ) |  | $ | (57,380 | ) |  | $ | (7,766 | )
Portion of loss recognized in accumulated other comprehensive income |  | 74 |  |  | — |  |  | — |
Net other-than-temporary impairment losses on fixed maturity securities recognized in earnings |  | $ | (38,731 | ) |  | $ | (57,380 | ) |  | $ | (7,766 | )
Gain on investment activity |  | 154,370 |  |  | 73,079 |  |  | 65,435 |
Loss on investment activity |  | (49,965 | ) |  | (71,893 | ) |  | (31,295 | )
Other impairment losses and change in mortgage loan provision |  | (11,006 | ) |  | (6,953 | ) |  | (5,315 | )
Derivatives and other, net |  | 39,527 |  |  | (101,603 | ) |  | 165,134 |
Total investment related gains (losses), net |  | $ | 94,195 |  |  | $ | (164,750 | ) |  | $ | 186,193 |
Schedule of Repurchase Agreements [Table Text Block] | The following table includes the amount of borrowed securities, securities lent and securities collateral received as part of the securities lending program, repurchased/reverse repurchased securities pledged and received and cash received as of December 31, 2016 and 2015 (dollars in thousands).
| 2016 |  | 2015
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Borrowed securities | $ | 263,820 |  |  | $ | 279,186 |  |  | $ | 259,540 |  |  | $ | 266,297 |
Securities lending: |  |  |  |  |  |  |  |  |  |
Securities loaned | 74,389 |  |  | 73,625 |  |  | — |  |  | — |
Securities received | n/a |  |  | 80,000 |  |  | n/a |  |  | — |
Repurchase program/reverse repurchase program: |  |  |  |  |  |  |
Securities pledged | 476,531 |  |  | 499,891 |  |  | 443,435 |  |  | 465,889 |
Securities received | n/a |  |  | 515,200 |  |  | n/a |  |  | 481,197 |
Cash received | — |  |  | 28,832 |  |  | — |  |  | — |
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block] | The following tables present information on the Company’s securities lending and repurchase transactions as of December 31, 2016 and 2015, respectively (dollars in thousands). Collateral associated with certain borrowed securities is not included within the tables as the collateral pledged to each counterparty is the right to reinsurance treaty cash flows.
| December 31, 2016
| Remaining Contractual Maturity of the Agreements
| Overnight and Continuous |  | Up to 30 Days |  | 30-90 Days |  | Greater than 90 Days |  | Total
Securities lending transaction: |  |  |  |  |  |  |  |  |
Corporate securities | $ | — |  |  | $ | — |  |  | $ | 4,017 |  |  | $ | 69,608 |  |  | $ | 73,625 |
Total | — |  |  | — |  |  | 4,017 |  |  | 69,608 |  |  | 73,625 |
Repurchase transactions: |  |  |  |  |  |  |  |  |
Corporate securities | — |  |  | — |  |  | 3,220 |  |  | 166,979 |  |  | 170,199 |
Residential mortgage-backed securities | — |  |  | — |  |  | — |  |  | 92,546 |  |  | 92,546 |
U.S. government and agencies | — |  |  | — |  |  | — |  |  | 216,000 |  |  | 216,000 |
Foreign government | — |  |  | — |  |  | — |  |  | 19,900 |  |  | 19,900 |
Other | 1,246 |  |  | — |  |  | — |  |  | — |  |  | 1,246 |
Total | 1,246 |  |  | — |  |  | 3,220 |  |  | 495,425 |  |  | 499,891 |
Total transactions | $ | 1,246 |  |  | $ | — |  |  | $ | 7,237 |  |  | $ | 565,033 |  |  | $ | 573,516 |
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table |  | $ | 624,032 |
Amounts related to agreements not included in offsetting disclosure |  | $ | 50,516 |
| December 31, 2015
| Remaining Contractual Maturity of the Agreements
| Overnight and Continuous |  | Up to 30 Days |  | 30-90 Days |  | Greater than 90 Days |  | Total
Repurchase transactions: |  |  |  |  |  |  |  |  |
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 transactions | $ | 15,186 |  |  | $ | 2,951 |  |  | $ | — |  |  | $ | 447,752 |  |  | $ | 465,889 |
Gross amount of recognized liabilities for repurchase transactions 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 by property type, gross of valuation allowances is as follows as of December 31, 2016 and 2015 (dollars in thousands):
|  | 2016 |  | 2015
|  | Recorded Investment |  | Percentage of Total |  | Recorded Investment |  | Percentage of Total
Property type: |  |  |  |  |  |  |  |
Office building |  | $ | 1,270,113 |  |  | 33.6 | % |  | $ | 980,858 |  |  | 31.3 | %
Retail |  | 1,179,936 |  |  | 31.2 |  |  | 1,026,018 |  |  | 32.7 |
Industrial |  | 713,461 |  |  | 18.8 |  |  | 527,485 |  |  | 16.8 |
Apartment |  | 447,088 |  |  | 11.8 |  |  | 420,014 |  |  | 13.4 |
Other commercial |  | 172,609 |  |  | 4.6 |  |  | 182,389 |  |  | 5.8 |
Total |  | $ | 3,783,207 |  |  | 100.0 | % |  | $ | 3,136,764 |  |  | 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, 2016 and 2015 are as follows (dollars in thousands):
|  | 2016 |  | 2015
|  | Recorded Investment |  | % of Total |  | Recorded Investment |  | % of Total
Due within five years |  | $ | 822,073 |  |  | 21.7 | % |  | $ | 873,280 |  |  | 27.8 | %
Due after five years through ten years |  | 2,099,559 |  |  | 55.5 |  |  | 1,561,535 |  |  | 49.8 |
Due after ten years |  | 861,575 |  |  | 22.8 |  |  | 701,949 |  |  | 22.4 |
Total |  | $ | 3,783,207 |  |  | 100.0 | % |  | $ | 3,136,764 |  |  | 100.0 | %
Financing Receivable Credit Quality Indicators [Table Text Block] | The following tables set forth certain key credit quality indicators of the Company’s recorded investment in mortgage loans, gross of valuation allowances, as of December 31, 2016 and 2015 (dollars in thousands):
| Recorded Investment
| Debt Service Ratios |  |  |  |
| >1.20x |  | 1.00x - 1.20x |  | <1.00x |  | Total |  | % of Total
December 31, 2016: |  |  |  |  |  |  |  |  |
Loan-to-Value Ratio |  |  |  |  |  |  |  |  |
0% - 59.99% | $ | 1,859,640 |  |  | $ | 64,749 |  |  | $ | 1,366 |  |  | $ | 1,925,755 |  |  | 50.8 | %
60% - 69.99% | 1,257,788 |  |  | 34,678 |  |  | — |  |  | 1,292,466 |  |  | 34.2 |
70% - 79.99% | 370,092 |  |  | 20,869 |  |  | 24,369 |  |  | 415,330 |  |  | 11.0 |
Greater than 80% | 114,297 |  |  | — |  |  | 35,359 |  |  | 149,656 |  |  | 4.0 |
Total | $ | 3,601,817 |  |  | $ | 120,296 |  |  | $ | 61,094 |  |  | $ | 3,783,207 |  |  | 100.0 | %
| Recorded Investment
| Debt Service Ratios |  |  |  |
| >1.20x |  | 1.00x - 1.20x |  | <1.00x |  | Total |  | % of Total
December 31, 2015: |  |  |  |  |  |  |  |  |
Loan-to-Value Ratio |  |  |  |  |  |  |  |  |
0% - 59.99% | $ | 1,621,056 |  |  | $ | 77,118 |  |  | $ | 2,367 |  |  | $ | 1,700,541 |  |  | 54.2 | %
60% - 69.99% | 881,611 |  |  | 14,332 |  |  | 19,805 |  |  | 915,748 |  |  | 29.2 | %
70% - 79.99% | 446,565 |  |  | 7,947 |  |  | 34,539 |  |  | 489,051 |  |  | 15.6 | %
Greater than 80% | 3,948 |  |  | 13,550 |  |  | 13,926 |  |  | 31,424 |  |  | 1.0 | %
Total | $ | 2,953,180 |  |  | $ | 112,947 |  |  | $ | 70,637 |  |  | $ | 3,136,764 |  |  | 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, 2016 and 2015 (dollars in thousands):
|  | 2016 |  | 2015
Mortgage loans: |  |  |  |
Individually measured for impairment |  | $ | 2,216 |  |  | $ | 16,421 |
Collectively measured for impairment |  | 3,780,991 |  |  | 3,120,343 |
Mortgage loans, gross of valuation allowances |  | 3,783,207 |  |  | 3,136,764 |
Valuation allowances: |  |  |  |
Individually measured for impairment |  | — |  |  | 588 |
Collectively measured for impairment |  | 7,685 |  |  | 6,225 |
Total valuation allowances |  | 7,685 |  |  | 6,813 |
Mortgage loans, net of valuation allowances |  | $ | 3,775,522 |  |  | $ | 3,129,951 |
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, 2016, 2015 and 2014 are as follows (dollars in thousands):
|  | 2016 |  | 2015 |  | 2014
Balance, beginning of period |  | $ | 6,813 |  |  | $ | 6,471 |  |  | $ | 10,106 |
Charge-offs, net of recoveries |  | — |  |  | — |  |  | (2,731 | )
Provision (release) |  | 872 |  |  | 342 |  |  | (904 | )
Balance, end of period |  | $ | 7,685 |  |  | $ | 6,813 |  |  | $ | 6,471 |
Impaired Financing Receivables [Table Text Block] | Information regarding the portion of the Company’s mortgage loans that were impaired as of December 31, 2016 and 2015 is as follows (dollars in thousands):
|  | Unpaid Principal Balance |  | Recorded Investment |  | Related Allowance |  | Carrying Value
December 31, 2016: |  |  |  |  |  |
Impaired mortgage loans with no valuation allowance recorded |  | $ | 2,758 |  |  | $ | 2,216 |  |  | $ | — |  |  | $ | 2,216 |
Impaired mortgage loans with valuation allowance recorded |  | — |  |  | — |  |  | — |  |  | — |
Total impaired mortgage loans |  | $ | 2,758 |  |  | $ | 2,216 |  |  | $ | — |  |  | $ | 2,216 |
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 |
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, 2016, 2015 and 2014 (dollars in thousands):
|  | 2016 |  | 2015 |  | 2014
|  | Average Investment(1) |  | Interest Income |  | Average Investment(1) |  | Interest Income |  | Average Investment(1) |  | Interest Income
Impaired mortgage loans with no valuation allowance recorded |  | $ | 2,249 |  |  | $ | 142 |  |  | $ | 6,033 |  |  | $ | 330 |  |  | $ | 13,227 |  |  | $ | 647 |
Impaired mortgage loans with valuation allowance recorded |  | — |  |  | — |  |  | 11,592 |  |  | 770 |  |  | 13,827 |  |  | 637 |
Total |  | $ | 2,249 |  |  | $ | 142 |  |  | $ | 17,625 |  |  | $ | 1,100 |  |  | $ | 27,054 |  |  | $ | 1,284 |
(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 3.6% and 3.1% of the Company’s total investments as of December 31, 2016 and 2015, respectively. Carrying values of these assets as of December 31, 2016 and 2015 are as follows (dollars in thousands):
|  | 2016 |  | 2015
Equity securities |  | $ | 275,361 |  |  | $ | 125,862 |
Limited partnerships and real estate joint ventures |  | 687,522 |  |  | 567,697 |
Derivatives |  | 229,108 |  |  | 256,178 |
FVO contractholder-directed unit-linked investments |  | 190,120 |  |  | 197,547 |
Other |  | 209,829 |  |  | 150,836 |
Total other invested assets |  | $ | 1,591,940 |  |  | $ | 1,298,120 |

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