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Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments [Abstract] |
Available-for-sale Securities [Table Text Block] | The following table provides information relating to investments in fixed maturity securities by sector as of December 31, 2018 (dollars in thousands):
December 31, 2018: |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value |  | % of Total |  | Other-than- temporary impairments in AOCI
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  | $ | 24,006,407 |  |  | $ | 530,804 |  |  | $ | 555,092 |  |  | $ | 23,982,119 |  |  | 59.9 | % |  | $ | — |
Canadian government |  | 2,768,466 |  |  | 1,126,227 |  |  | 2,308 |  |  | 3,892,385 |  |  | 9.7 |  |  | — |
RMBS |  | 1,872,236 |  |  | 22,267 |  |  | 25,282 |  |  | 1,869,221 |  |  | 4.7 |  |  | — |
ABS |  | 2,171,254 |  |  | 10,779 |  |  | 32,829 |  |  | 2,149,204 |  |  | 5.4 |  |  | 275 |
CMBS |  | 1,428,115 |  |  | 9,153 |  |  | 18,234 |  |  | 1,419,034 |  |  | 3.5 |  |  | — |
U.S. government |  | 2,233,537 |  |  | 10,204 |  |  | 57,867 |  |  | 2,185,874 |  |  | 5.5 |  |  | — |
State and political subdivisions |  | 721,290 |  |  | 39,914 |  |  | 9,010 |  |  | 752,194 |  |  | 1.9 |  |  | — |
Other foreign government |  | 3,680,863 |  |  | 109,320 |  |  | 47,868 |  |  | 3,742,315 |  |  | 9.4 |  |  | — |
Total fixed maturity securities |  | $ | 38,882,168 |  |  | $ | 1,858,668 |  |  | $ | 748,490 |  |  | $ | 39,992,346 |  |  | 100.0 | % |  | $ | 275 |
The following table provides information relating to investments in fixed maturity and equity securities by sector as of December 31, 2017 (dollars in thousands):
December 31, 2017: |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value |  | % of Total |  | Other-than- temporary impairments in AOCI
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  | $ | 21,966,803 |  |  | $ | 1,299,594 |  |  | $ | 55,429 |  |  | $ | 23,210,968 |  |  | 60.9 | % |  | $ | — |
Canadian government |  | 2,843,273 |  |  | 1,378,510 |  |  | 1,707 |  |  | 4,220,076 |  |  | 11.1 |  |  | — |
RMBS |  | 1,695,126 |  |  | 36,632 |  |  | 11,878 |  |  | 1,719,880 |  |  | 4.5 |  |  | — |
ABS |  | 1,634,758 |  |  | 18,798 |  |  | 5,194 |  |  | 1,648,362 |  |  | 4.3 |  |  | 275 |
CMBS |  | 1,285,594 |  |  | 22,627 |  |  | 4,834 |  |  | 1,303,387 |  |  | 3.4 |  |  | — |
U.S. government |  | 1,953,436 |  |  | 12,089 |  |  | 21,933 |  |  | 1,943,592 |  |  | 5.1 |  |  | — |
State and political subdivisions |  | 647,727 |  |  | 59,997 |  |  | 4,296 |  |  | 703,428 |  |  | 1.8 |  |  | — |
Other foreign government |  | 3,254,695 |  |  | 154,507 |  |  | 8,075 |  |  | 3,401,127 |  |  | 8.9 |  |  | — |
Total fixed maturity securities |  | $ | 35,281,412 |  |  | $ | 2,982,754 |  |  | $ | 113,346 |  |  | $ | 38,150,820 |  |  | 100.0 | % |  | $ | 275 |
Non-redeemable preferred stock |  | $ | 41,553 |  |  | $ | 479 |  |  | $ | 2,226 |  |  | $ | 39,806 |  |  | 39.7 | % |  |
Other equity securities |  | 61,288 |  |  | 479 |  |  | 1,421 |  |  | 60,346 |  |  | 60.3 |  |  |
Total equity securities |  | $ | 102,841 |  |  | $ | 958 |  |  | $ | 3,647 |  |  | $ | 100,152 |  |  | 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, 2018 and 2017 (dollars in thousands):
| 2018 |  | 2017
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Fixed maturity securities pledged as collateral | $ | 80,891 |  |  | $ | 83,950 |  |  | $ | 72,542 |  |  | $ | 75,622 |
Fixed maturity securities received as collateral | n/a |  |  | 616,584 |  |  | n/a |  |  | 590,417 |
Assets in trust held to satisfy collateral requirements | 20,072,735 |  |  | 20,366,170 |  |  | 15,584,296 |  |  | 16,715,281 |
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, 2018 and 2017 (dollars in thousands):
| 2018 |  | 2017
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Fixed maturity securities guaranteed or issued by: |  |  |  |  |  |  |
Canadian province of Quebec | $ | 1,091,018 |  |  | $ | 1,757,087 |  |  | $ | 1,119,337 |  |  | $ | 1,917,996 |
Canadian province of Ontario | 913,642 |  |  | 1,187,526 |  |  | 939,837 |  |  | 1,282,944 |
Investments Classified By Contractual Maturity Date [Table Text Block] | The amortized cost and estimated fair value of fixed maturity securities classified as available-for-sale as of December 31, 2018 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 |  | $ | 1,185,868 |  |  | $ | 1,190,931 |
Due after one year through five years |  | 8,760,200 |  |  | 8,851,307 |
Due after five years through ten years |  | 9,060,972 |  |  | 9,149,497 |
Due after ten years |  | 14,403,523 |  |  | 15,363,152 |
Asset and mortgage-backed securities |  | 5,471,605 |  |  | 5,437,459 |
Total |  | $ | 38,882,168 |  |  | $ | 39,992,346 |
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, 2018 and 2017 (dollars in thousands):
December 31, 2018: |  | Amortized Cost |  | Estimated Fair Value |  | % of Total
Finance |  | $ | 8,793,742 |  |  | $ | 8,730,568 |  |  | 36.3 | %
Industrial |  | 12,336,857 |  |  | 12,342,111 |  |  | 51.6 |
Utility |  | 2,875,808 |  |  | 2,909,440 |  |  | 12.1 |
Total |  | $ | 24,006,407 |  |  | $ | 23,982,119 |  |  | 100.0 | %
December 31, 2017: |  | Amortized Cost |  | Estimated Fair Value |  | % of Total
Finance |  | $ | 7,977,885 |  |  | $ | 8,362,774 |  |  | 36.1 | %
Industrial |  | 11,535,166 |  |  | 12,199,333 |  |  | 52.5 |
Utility |  | 2,453,752 |  |  | 2,648,861 |  |  | 11.4 |
Total |  | $ | 21,966,803 |  |  | $ | 23,210,968 |  |  | 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):
|  | 2018 |  | 2017 |  | 2016
Balance, beginning of period |  | $ | 3,677 |  |  | $ | 6,013 |  |  | $ | 7,284 |
Additional impairments - credit loss OTTI recognized on securities previously impaired |  | — |  |  | — |  |  | 231 |
Credit loss impairments previously recognized on securities impaired to fair value during the period |  | — |  |  | (2,336 | ) |  | — |
Credit loss previously recognized on securities that matured, paid down, prepaid or were sold during the period |  | — |  |  | — |  |  | (1,502 | )
Balance, end of period |  | $ | 3,677 |  |  | $ | 3,677 |  |  | $ | 6,013 |
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures [Table Text Block] | The following table presents the total gross unrealized losses for the 3,109 fixed maturity securities as of December 31, 2018, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):
|  | 2018
|  | Gross Unrealized Losses |  | % of Total
Less than 20% |  | $ | 721,015 |  |  | 96.3 | %
20% or more for less than six months |  | 21,336 |  |  | 2.9 |
20% or more for six months or greater |  | 6,139 |  |  | 0.8 |
Total |  | $ | 748,490 |  |  | 100.0 | %
The following table presents the total gross unrealized losses for the 1,116 fixed maturity and equity securities as of December 31, 2017, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):
|  | 2017
|  | Gross Unrealized Losses |  | % of Total
Less than 20% |  | $ | 113,466 |  |  | 97.0 | %
20% or more for less than six months |  | 689 |  |  | 0.6 |
20% or more for six months or greater |  | 2,838 |  |  | 2.4 |
Total |  | $ | 116,993 |  |  | 100.0 | %
Fair Value And Investments In Debt And Equity Securities Disclosures [Table Text Block] | The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 3,109 fixed maturity securities that have estimated fair values below amortized cost as of December 31, 2018 (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
December 31, 2018: |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
Investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  | $ | 8,505,371 |  |  | $ | 302,604 |  |  | $ | 3,611,266 |  |  | $ | 195,082 |  |  | $ | 12,116,637 |  |  | $ | 497,686 |
Canadian government |  | 25,169 |  |  | 419 |  |  | 131,806 |  |  | 1,612 |  |  | 156,975 |  |  | 2,031 |
RMBS |  | 269,558 |  |  | 2,488 |  |  | 836,741 |  |  | 22,760 |  |  | 1,106,299 |  |  | 25,248 |
ABS |  | 1,102,677 |  |  | 24,271 |  |  | 381,609 |  |  | 8,523 |  |  | 1,484,286 |  |  | 32,794 |
CMBS |  | 384,259 |  |  | 4,304 |  |  | 414,719 |  |  | 13,930 |  |  | 798,978 |  |  | 18,234 |
U.S. government |  | 8,616 |  |  | 80 |  |  | 1,086,694 |  |  | 57,787 |  |  | 1,095,310 |  |  | 57,867 |
State and political subdivisions |  | 103,504 |  |  | 1,538 |  |  | 157,330 |  |  | 7,472 |  |  | 260,834 |  |  | 9,010 |
Other foreign government |  | 789,859 |  |  | 24,509 |  |  | 472,934 |  |  | 17,446 |  |  | 1,262,793 |  |  | 41,955 |
Total investment grade securities |  | 11,189,013 |  |  | 360,213 |  |  | 7,093,099 |  |  | 324,612 |  |  | 18,282,112 |  |  | 684,825 |
Below investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  | 755,679 |  |  | 42,760 |  |  | 122,559 |  |  | 14,646 |  |  | 878,238 |  |  | 57,406 |
Canadian government |  | 443 |  |  | 34 |  |  | 1,770 |  |  | 243 |  |  | 2,213 |  |  | 277 |
RMBS |  | — |  |  | — |  |  | 1,026 |  |  | 34 |  |  | 1,026 |  |  | 34 |
ABS |  | — |  |  | — |  |  | 1,063 |  |  | 35 |  |  | 1,063 |  |  | 35 |
Other foreign government |  | 128,725 |  |  | 5,574 |  |  | 7,479 |  |  | 339 |  |  | 136,204 |  |  | 5,913 |
Total below investment grade securities |  | 884,847 |  |  | 48,368 |  |  | 133,897 |  |  | 15,297 |  |  | 1,018,744 |  |  | 63,665 |
Total fixed maturity securities |  | $ | 12,073,860 |  |  | $ | 408,581 |  |  | $ | 7,226,996 |  |  | $ | 339,909 |  |  | $ | 19,300,856 |  |  | $ | 748,490 |
The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 1,116 fixed maturity and equity securities that have estimated fair values below amortized cost as of December 31, 2017 (dollars in thousands):
|  | Less than 12 months |  | 12 months or greater |  | Total
December 31, 2017: |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
Investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  | $ | 1,886,212 |  |  | $ | 17,099 |  |  | $ | 1,009,750 |  |  | $ | 28,080 |  |  | $ | 2,895,962 |  |  | $ | 45,179 |
Canadian government |  | 18,688 |  |  | 91 |  |  | 111,560 |  |  | 1,596 |  |  | 130,248 |  |  | 1,687 |
RMBS |  | 566,699 |  |  | 5,852 |  |  | 224,439 |  |  | 6,004 |  |  | 791,138 |  |  | 11,856 |
ABS |  | 434,274 |  |  | 2,707 |  |  | 168,524 |  |  | 2,434 |  |  | 602,798 |  |  | 5,141 |
CMBS |  | 220,401 |  |  | 1,914 |  |  | 103,269 |  |  | 2,920 |  |  | 323,670 |  |  | 4,834 |
U.S. government |  | 800,298 |  |  | 6,177 |  |  | 767,197 |  |  | 15,756 |  |  | 1,567,495 |  |  | 21,933 |
State and political subdivisions |  | 43,510 |  |  | 242 |  |  | 68,666 |  |  | 4,054 |  |  | 112,176 |  |  | 4,296 |
Other foreign government |  | 369,717 |  |  | 2,707 |  |  | 191,265 |  |  | 4,704 |  |  | 560,982 |  |  | 7,411 |
Total investment grade securities |  | 4,339,799 |  |  | 36,789 |  |  | 2,644,670 |  |  | 65,548 |  |  | 6,984,469 |  |  | 102,337 |
Below investment grade securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  | 194,879 |  |  | 3,317 |  |  | 75,731 |  |  | 6,933 |  |  | 270,610 |  |  | 10,250 |
Canadian government |  | 1,995 |  |  | 20 |  |  | — |  |  | — |  |  | 1,995 |  |  | 20 |
RMBS |  | — |  |  | — |  |  | 1,369 |  |  | 22 |  |  | 1,369 |  |  | 22 |
ABS |  | — |  |  | — |  |  | 1,489 |  |  | 53 |  |  | 1,489 |  |  | 53 |
Other foreign government |  | 28,600 |  |  | 113 |  |  | 15,134 |  |  | 551 |  |  | 43,734 |  |  | 664 |
Total below investment grade securities |  | 225,474 |  |  | 3,450 |  |  | 93,723 |  |  | 7,559 |  |  | 319,197 |  |  | 11,009 |
Total fixed maturity securities |  | $ | 4,565,273 |  |  | $ | 40,239 |  |  | $ | 2,738,393 |  |  | $ | 73,107 |  |  | $ | 7,303,666 |  |  | $ | 113,346 |
Non-redeemable preferred stock |  | $ | 82 |  |  | $ | 1 |  |  | $ | 26,471 |  |  | $ | 2,225 |  |  | $ | 26,553 |  |  | $ | 2,226 |
Other equity securities |  | 5,820 |  |  | 1,023 |  |  | 47,251 |  |  | 398 |  |  | 53,071 |  |  | 1,421 |
Total equity securities |  | $ | 5,902 |  |  | $ | 1,024 |  |  | $ | 73,722 |  |  | $ | 2,623 |  |  | $ | 79,624 |  |  | $ | 3,647 |
Investment Income [Table Text Block] | Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):
|  | 2018 |  | 2017 |  | 2016
Fixed maturity securities available-for-sale |  | $ | 1,528,086 |  |  | $ | 1,401,585 |  |  | $ | 1,285,406 |
Equity securities |  | 4,343 |  |  | 4,445 |  |  | 12,513 |
Mortgage loans on real estate |  | 214,387 |  |  | 197,755 |  |  | 168,582 |
Policy loans |  | 59,332 |  |  | 60,617 |  |  | 63,837 |
Funds withheld at interest |  | 309,977 |  |  | 457,774 |  |  | 368,728 |
Short-term investments and cash and cash equivalents |  | 14,349 |  |  | 7,171 |  |  | 8,051 |
Other invested assets |  | 98,557 |  |  | 106,015 |  |  | 76,858 |
Investment income |  | 2,229,031 |  |  | 2,235,362 |  |  | 1,983,975 |
Investment expense |  | (90,506 | ) |  | (80,711 | ) |  | (72,089 | )
Investment income, net of related expenses |  | $ | 2,138,525 |  |  | $ | 2,154,651 |  |  | $ | 1,911,886 |
Gain (Loss) on Securities [Table Text Block] | Investment related gains (losses), net, consist of the following (dollars in thousands):
|  | 2018 |  | 2017 |  | 2016
Fixed maturity securities available-for-sale: |  |  |  |  |  |
Other-than-temporary impairment losses |  | $ | (28,494 | ) |  | $ | (42,639 | ) |  | $ | (38,805 | )
Portion of loss recognized in accumulated other comprehensive income |  | — |  |  | — |  |  | 74 |
Gain on investment activity |  | 65,211 |  |  | 110,546 |  |  | 145,172 |
Loss on investment activity |  | (158,870 | ) |  | (37,328 | ) |  | (47,094 | )
Equity securities: |  |  |  |  |  |  |
Other-than-temporary impairment losses |  | — |  |  | (1,202 | ) |  | — |
Gain on investment activity |  | 4,429 |  |  | 23 |  |  | 9,198 |
Loss on investment activity |  | (1,937 | ) |  | (4,351 | ) |  | (2,871 | )
Change in unrealized gains (losses) recognized in earnings |  | (23,184 | ) |  | — |  |  | — |
Other impairment losses and change in mortgage loan provision |  | (11,919 | ) |  | (9,497 | ) |  | (11,006 | )
Derivatives and other, net |  | (15,324 | ) |  | 152,328 |  |  | 39,527 |
Total investment related gains (losses), net |  | $ | (170,088 | ) |  | $ | 167,880 |  |  | $ | 94,195 |
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, 2018 and 2017 (dollars in thousands):
| 2018 |  | 2017
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Borrowed securities | $ | 335,781 |  |  | $ | 366,663 |  |  | $ | 358,875 |  |  | $ | 377,820 |
Securities lending: |  |  |  |  |  |  |  |  |  |
Securities loaned | 101,981 |  |  | 102,618 |  |  | 117,246 |  |  | 121,551 |
Securities received | n/a |  |  | 112,000 |  |  | n/a |  |  | 128,000 |
Repurchase program/reverse repurchase program: |  |  |  |  |  |  |
Securities pledged | 554,806 |  |  | 554,589 |  |  | 413,819 |  |  | 428,344 |
Securities received | n/a |  |  | 530,932 |  |  | n/a |  |  | 417,550 |
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, 2018 and 2017, 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, 2018
| 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 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 102,618 |  |  | $ | 102,618 |
Total | — |  |  | — |  |  | — |  |  | 102,618 |  |  | 102,618 |
Repurchase transactions: |  |  |  |  |  |  |  |  |
Corporate | — |  |  | — |  |  | — |  |  | 254,151 |  |  | 254,151 |
U.S. government | — |  |  | — |  |  | — |  |  | 221,572 |  |  | 221,572 |
Foreign government | — |  |  | — |  |  | — |  |  | 78,866 |  |  | 78,866 |
Total | — |  |  | — |  |  | — |  |  | 554,589 |  |  | 554,589 |
Total transactions | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 657,207 |  |  | $ | 657,207 |
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table |  | $ | 671,492 |
Amounts related to agreements not included in offsetting disclosure |  | $ | 14,285 |
| December 31, 2017
| 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 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 121,551 |  |  | $ | 121,551 |
Total | — |  |  | — |  |  | — |  |  | 121,551 |  |  | 121,551 |
Repurchase transactions: |  |  |  |  |  |  |  |  |
Corporate | — |  |  | — |  |  | 312 |  |  | 184,334 |  |  | $ | 184,646 |
U.S. government | — |  |  | — |  |  | — |  |  | 220,765 |  |  | 220,765 |
Foreign government | — |  |  | — |  |  | — |  |  | 21,802 |  |  | 21,802 |
Other | 1,131 |  |  | — |  |  | — |  |  | — |  |  | 1,131 |
Total | 1,131 |  |  | — |  |  | 312 |  |  | 426,901 |  |  | 428,344 |
Total transactions | $ | 1,131 |  |  | $ | — |  |  | $ | 312 |  |  | $ | 548,452 |  |  | $ | 549,895 |
Gross amount of recognized liabilities for repurchase transactions in preceding table |  | $ | 576,786 |
Amounts related to agreements not included in offsetting disclosure |  | $ | 26,891 |
Disclosure Of Real Estate Holdings By Property Type [Table Text Block] | The recorded investment in mortgage loans on real estate presented below is gross of unamortized deferred loan origination fees and expenses, and valuation allowances. The distribution of mortgage loans by property type is as follows as of December 31, 2018 and 2017 (dollars in thousands):
|  | 2018 |  | 2017
|  | Carrying Value |  | Percentage of Total |  | Carrying Value |  | Percentage of Total
Property type: |  |  |  |  |  |  |  |
Office building |  | $ | 1,725,748 |  |  | 34.6 | % |  | $ | 1,487,392 |  |  | 33.6 | %
Retail |  | 1,432,394 |  |  | 28.7 |  |  | 1,270,676 |  |  | 28.8 |
Industrial |  | 961,924 |  |  | 19.3 |  |  | 938,612 |  |  | 21.3 |
Apartment |  | 571,291 |  |  | 11.5 |  |  | 510,052 |  |  | 11.6 |
Other commercial |  | 291,997 |  |  | 5.9 |  |  | 206,439 |  |  | 4.7 |
Recorded investment |  | $ | 4,983,354 |  |  | 100.0 | % |  | $ | 4,413,171 |  |  | 100.0 | %
Unamortized balance of loan origination fees and expenses |  | (5,770 | ) |  |  |  | (3,254 | ) |  |
Valuation allowances |  | (11,286 | ) |  |  |  | (9,384 | ) |  |
Total mortgage loans on real estate |  | $ | 4,966,298 |  |  |  |  |  | $ | 4,400,533 |  |  |  |
Disclosure of Real Estate Holdings Classified By Contractual Maturity Date [Table Text Block] | The maturities of the mortgage loans as of December 31, 2018 and 2017 are as follows (dollars in thousands):
|  | 2018 |  | 2017
|  | Recorded Investment |  | % of Total |  | Recorded Investment |  | % of Total
Due within five years |  | $ | 1,425,598 |  |  | 28.6 | % |  | $ | 1,091,066 |  |  | 24.8 | %
Due after five years through ten years |  | 2,686,264 |  |  | 53.9 |  |  | 2,516,872 |  |  | 57.0 |
Due after ten years |  | 871,492 |  |  | 17.5 |  |  | 805,233 |  |  | 18.2 |
Total |  | $ | 4,983,354 |  |  | 100.0 | % |  | $ | 4,413,171 |  |  | 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 as of December 31, 2018 and 2017 (dollars in thousands):
| Recorded Investment
| Debt Service Ratios |  | Construction loans |  |  |  |
| >1.20x |  | 1.00x - 1.20x |  | <1.00x |  |  | Total |  | % of Total
December 31, 2018: |  |  |  |  |  |  |  |  |  |  |
Loan-to-Value Ratio |  |  |  |  |  |  |  |  |  |  |
0% - 59.99% | $ | 2,410,556 |  |  | $ | 61,246 |  |  | $ | 38,177 |  |  | $ | 13,691 |  |  | $ | 2,523,670 |  |  | 50.6 | %
60% - 69.99% | 1,618,374 |  |  | 73,908 |  |  | 38,120 |  |  | 18,929 |  |  | 1,749,331 |  |  | 35.1 |
70% - 79.99% | 414,269 |  |  | 48,438 |  |  | 54,440 |  |  | — |  |  | 517,147 |  |  | 10.4 |
Greater than 80% | 117,978 |  |  | 49,668 |  |  | 25,560 |  |  | — |  |  | 193,206 |  |  | 3.9 |
Total | $ | 4,561,177 |  |  | $ | 233,260 |  |  | $ | 156,297 |  |  | $ | 32,620 |  |  | $ | 4,983,354 |  |  | 100.0 | %
| Recorded Investment
| Debt Service Ratios |  | Construction loans |  |  |  |
| >1.20x |  | 1.00x - 1.20x |  | <1.00x |  |  | Total |  | % of Total
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |
Loan-to-Value Ratio |  |  |  |  |  |  |  |  |  |  |
0% - 59.99% | $ | 2,148,428 |  |  | $ | 53,979 |  |  | $ | 3,801 |  |  | $ | — |  |  | $ | 2,206,208 |  |  | 50.0 | %
60% - 69.99% | 1,517,029 |  |  | 47,128 |  |  | 43,921 |  |  | — |  |  | 1,608,078 |  |  | 36.4 |
70% - 79.99% | 396,446 |  |  | 19,461 |  |  | 15,367 |  |  | — |  |  | 431,274 |  |  | 9.8 |
Greater than 80% | 120,850 |  |  | 30,713 |  |  | 6,362 |  |  | 9,686 |  |  | 167,611 |  |  | 3.8 |
Total | $ | 4,182,753 |  |  | $ | 151,281 |  |  | $ | 69,451 |  |  | $ | 9,686 |  |  | $ | 4,413,171 |  |  | 100.0 | %
Past Due Financing Receivables [Table Text Block] | The age analysis of the Company’s past due recorded investments in mortgage loans as of December 31, 2018 and 2017 (dollars in thousands):
|  | 2018 |  | 2017
31-60 days past due |  | $ | — |  |  | $ | 17,100 |
61-90 days past due |  | — |  |  | 2,056 |
Total past due |  | — |  |  | 19,156 |
Current |  | 4,983,354 |  |  | 4,394,015 |
Total |  | $ | 4,983,354 |  |  | $ | 4,413,171 |
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, 2018 and 2017 (dollars in thousands):
|  | 2018 |  | 2017
Mortgage loans: |  |  |  |
Individually measured for impairment |  | $ | 30,635 |  |  | $ | 5,858 |
Collectively measured for impairment |  | 4,952,719 |  |  | 4,407,313 |
Recorded investment |  | $ | 4,983,354 |  |  | $ | 4,413,171 |
Valuation allowances: |  |  |  |
Individually measured for impairment |  | $ | — |  |  | $ | — |
Collectively measured for impairment |  | 11,286 |  |  | 9,384 |
Total valuation allowances |  | $ | 11,286 |  |  | $ | 9,384 |
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, 2018, 2017 and 2016 are as follows (dollars in thousands):
|  | 2018 |  | 2017 |  | 2016
Balance, beginning of period |  | $ | 9,384 |  |  | $ | 7,685 |  |  | $ | 6,813 |
Provision |  | 1,918 |  |  | 1,691 |  |  | 872 |
Translation adjustment |  | (16 | ) |  | 8 |  |  | — |
Balance, end of period |  | $ | 11,286 |  |  | $ | 9,384 |  |  | $ | 7,685 |
Impaired Financing Receivables [Table Text Block] | Information regarding the portion of the Company’s mortgage loans that were impaired as of December 31, 2018 and 2017 is as follows (dollars in thousands):
|  | Unpaid Principal Balance |  | Recorded Investment |  | Related Allowance |  | Carrying Value
December 31, 2018: |  |  |  |  |  |
Impaired mortgage loans with no valuation allowance recorded |  | $ | 30,660 |  |  | $ | 30,635 |  |  | $ | — |  |  | $ | 30,635 |
Impaired mortgage loans with valuation allowance recorded |  | — |  |  | — |  |  | — |  |  | — |
Total impaired mortgage loans |  | $ | 30,660 |  |  | $ | 30,635 |  |  | $ | — |  |  | $ | 30,635 |
December 31, 2017: |  |  |  |  |  |  |  |
Impaired mortgage loans with no valuation allowance recorded |  | $ | 6,427 |  |  | $ | 5,858 |  |  | $ | — |  |  | $ | 5,858 |
Impaired mortgage loans with valuation allowance recorded |  | — |  |  | — |  |  | — |  |  | — |
Total impaired mortgage loans |  | $ | 6,427 |  |  | $ | 5,858 |  |  | $ | — |  |  | $ | 5,858 |
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, 2018, 2017 and 2016 (dollars in thousands):
|  | 2018 |  | 2017 |  | 2016
|  | Average Investment(1) |  | Interest Income |  | Average Investment(1) |  | Interest Income |  | Average Investment(1) |  | Interest Income
Impaired mortgage loans with no valuation allowance recorded |  | $ | 24,240 |  |  | $ | 1,129 |  |  | $ | 3,621 |  |  | $ | 186 |  |  | $ | 2,249 |  |  | $ | 142 |
Impaired mortgage loans with valuation allowance recorded |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total |  | $ | 24,240 |  |  | $ | 1,129 |  |  | $ | 3,621 |  |  | $ | 186 |  |  | $ | 2,249 |  |  | $ | 142 |
(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 3.5% and 2.9% of the Company’s total investments as of December 31, 2018 and 2017, respectively. Carrying values of these assets as of December 31, 2018 and 2017 are as follows (dollars in thousands):
|  | 2018 |  | 2017
Limited partnership interests and real estate joint ventures |  | $ | 965,094 |  |  | $ | 781,124 |
Equity release mortgages |  | 475,905 |  |  | 219,940 |
Derivatives |  | 180,699 |  |  | 137,613 |
FVO contractholder-directed unit-linked investments |  | 197,770 |  |  | 218,541 |
Other |  | 95,829 |  |  | 148,114 |
Total other invested assets |  | $ | 1,915,297 |  |  | $ | 1,505,332 |

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