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Fair Value of Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | Assets and liabilities measured at fair value on a recurring basis as of December 31, 2018 and 2017 are summarized below (dollars in thousands):
December 31, 2018: |  |  |  | Fair Value Measurements Using:
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |
Fixed maturity securities – available-for-sale: |  |  |  |  |  |  |  |
Corporate |  | $ | 23,982,119 |  |  | $ | — |  |  | $ | 22,651,194 |  |  | $ | 1,330,925 |
Canadian government |  | 3,892,385 |  |  | — |  |  | 3,364,261 |  |  | 528,124 |
RMBS |  | 1,869,221 |  |  | — |  |  | 1,862,366 |  |  | 6,855 |
ABS |  | 2,149,204 |  |  | — |  |  | 2,053,632 |  |  | 95,572 |
CMBS |  | 1,419,034 |  |  | — |  |  | 1,419,012 |  |  | 22 |
U.S. government |  | 2,185,874 |  |  | 2,067,529 |  |  | 100,320 |  |  | 18,025 |
State and political subdivisions |  | 752,194 |  |  | — |  |  | 741,992 |  |  | 10,202 |
Other foreign government |  | 3,742,315 |  |  | — |  |  | 3,737,309 |  |  | 5,006 |
Total fixed maturity securities – available-for-sale |  | 39,992,346 |  |  | 2,067,529 |  |  | 35,930,086 |  |  | 1,994,731 |
Equity securities |  | 82,197 |  |  | 48,737 |  |  | — |  |  | 33,460 |
Funds withheld at interest – embedded derivatives |  | 109,597 |  |  | — |  |  | — |  |  | 109,597 |
Cash equivalents |  | 485,167 |  |  | 473,509 |  |  | 11,658 |  |  | — |
Short-term investments |  | 105,991 |  |  | 4,989 |  |  | 98,774 |  |  | 2,228 |
Other invested assets: |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Interest rate swaps |  | 37,976 |  |  | — |  |  | 37,976 |  |  | — |
Foreign currency forwards |  | 50,740 |  |  | — |  |  | 50,740 |  |  | — |
Credit default swaps |  | 4,466 |  |  | — |  |  | 4,466 |  |  | — |
Equity options |  | 36,206 |  |  | — |  |  | 36,206 |  |  | — |
Foreign currency swaps |  | 51,311 |  |  | — |  |  | 51,311 |  |  | — |
FVO contractholder-directed unit-linked investments |  | 197,770 |  |  | 196,781 |  |  | 989 |  |  | — |
Total other invested assets |  | 378,469 |  |  | 196,781 |  |  | 181,688 |  |  | — |
Other assets - longevity swaps |  | 47,789 |  |  | — |  |  | — |  |  | 47,789 |
Total |  | $ | 41,201,556 |  |  | $ | 2,791,545 |  |  | $ | 36,222,206 |  |  | $ | 2,187,805 |
Liabilities: |  |  |  |  |  |  |  |
Interest-sensitive contract liabilities – embedded derivatives |  | $ | 944,865 |  |  | $ | — |  |  | $ | — |  |  | $ | 944,865 |
Other liabilities: |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Interest rate swaps |  | 18,542 |  |  | — |  |  | 18,542 |  |  | — |
Foreign currency swaps - non-hedged |  | 4,155 |  |  | — |  |  | 4,155 |  |  | — |
CPI swaps |  | 11,384 |  |  | — |  |  | 11,384 |  |  | — |
Credit default swaps |  | (371 | ) |  | — |  |  | (371 | ) |  | — |
Equity options |  | (6,630 | ) |  | — |  |  | (6,630 | ) |  | — |
Mortality swaps |  | 369 |  |  | — |  |  | — |  |  | 369 |
Total |  | $ | 972,314 |  |  | $ | — |  |  | $ | 27,080 |  |  | $ | 945,234 |
December 31, 2017: |  |  |  | Fair Value Measurements Using:
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |
Fixed maturity securities – available-for-sale: |  |  |  |  |  |  |  |
Corporate |  | $ | 23,210,968 |  |  | $ | — |  |  | $ | 21,873,696 |  |  | $ | 1,337,272 |
Canadian government |  | 4,220,076 |  |  | — |  |  | 3,626,134 |  |  | 593,942 |
RMBS |  | 1,719,880 |  |  | — |  |  | 1,611,998 |  |  | 107,882 |
ABS |  | 1,648,362 |  |  | — |  |  | 1,524,888 |  |  | 123,474 |
CMBS |  | 1,303,387 |  |  | — |  |  | 1,300,153 |  |  | 3,234 |
U.S. government |  | 1,943,592 |  |  | 1,818,006 |  |  | 103,075 |  |  | 22,511 |
State and political subdivisions |  | 703,428 |  |  | — |  |  | 662,225 |  |  | 41,203 |
Other foreign government |  | 3,401,127 |  |  | — |  |  | 3,396,035 |  |  | 5,092 |
Total fixed maturity securities – available-for-sale |  | 38,150,820 |  |  | 1,818,006 |  |  | 34,098,204 |  |  | 2,234,610 |
Equity securities: |  |  |  |  |  |  |  |
Non-redeemable preferred stock |  | 39,806 |  |  | 39,806 |  |  | — |  |  | — |
Other equity securities |  | 60,346 |  |  | 60,346 |  |  | — |  |  | — |
Funds withheld at interest – embedded derivatives |  | 122,194 |  |  | — |  |  | — |  |  | 122,194 |
Cash equivalents |  | 356,788 |  |  | 354,071 |  |  | 2,717 |  |  | — |
Short-term investments |  | 50,746 |  |  | — |  |  | 47,650 |  |  | 3,096 |
Other invested assets: |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Interest rate swaps |  | 51,359 |  |  | — |  |  | 51,359 |  |  | — |
Foreign currency forwards |  | 730 |  |  | — |  |  | 730 |  |  | — |
CPI swaps |  | (221 | ) |  | — |  |  | (221 | ) |  | — |
Credit default swaps |  | 5,908 |  |  | — |  |  | 5,908 |  |  | — |
Equity options |  | 16,932 |  |  | — |  |  | 16,932 |  |  | — |
Foreign currency swaps |  | 62,905 |  |  | — |  |  | 62,905 |  |  | — |
FVO contractholder-directed unit-linked investments |  | 218,541 |  |  | 217,618 |  |  | 923 |  |  | — |
Total other invested assets |  | 356,154 |  |  | 217,618 |  |  | 138,536 |  |  | — |
Other assets - longevity swaps |  | 40,659 |  |  | — |  |  | — |  |  | 40,659 |
Total |  | $ | 39,177,513 |  |  | $ | 2,489,847 |  |  | $ | 34,287,107 |  |  | $ | 2,400,559 |
Liabilities: |  |  |  |  |  |  |  |
Interest-sensitive contract liabilities – embedded derivatives |  | $ | 1,014,228 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,014,228 |
Other liabilities: |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Interest rate swaps |  | 14,311 |  |  | — |  |  | 14,311 |  |  | — |
Foreign currency forwards |  | 7,213 |  |  | — |  |  | 7,213 |  |  | — |
CPI swaps |  | 1,939 |  |  | — |  |  | 1,939 |  |  | — |
Credit default swaps |  | (760 | ) |  | — |  |  | (760 | ) |  | — |
Equity options |  | (6,339 | ) |  | — |  |  | (6,339 | ) |  | — |
Foreign currency swaps |  | 6,194 |  |  | — |  |  | 6,194 |  |  | — |
Mortality swaps |  | 1,683 |  |  | — |  |  | — |  |  | 1,683 |
Total |  | $ | 1,038,469 |  |  | $ | — |  |  | $ | 22,558 |  |  | $ | 1,015,911 |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Level Transfers [Table Text Block] | There were no transfers between Level 1 and Level 2 for the year ended December 31, 2018. The following table presents the transfers between Level 1 and Level 2 during the year ended December 31, 2017 (dollars in thousands):
|  | 2017
|  | Transfers from Level 1 to Level 2 |  | Transfers from Level 2 to Level 1
Fixed maturity securities - available-for-sale: |  |  |  |
Corporate |  | $ | 596,809 |  |  | $ | 88,674 |
Other foreign government |  | 317,640 |  |  | — |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] | The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements that are developed internally by the Company as of December 31, 2018 and 2017 (dollars in thousands):
|  | Fair Value |  | Valuation |  | Unobservable |  | Range (Weighted Average)
Assets: |  | 2018 |  | 2017 |  | Technique |  | Input |  | 2018 |  | 2017
Corporate |  | $ | 642,647 |  |  | $ | 173,579 |  |  | Market comparable securities |  | Liquidity premium |  | 0-5% (1%) |  |  | 0-2% (1%) |
|  |  |  |  |  |  |  | EBITDA Multiple |  | 5.9x-7.5x (6.5x) |  |  | — |
ABS |  | 77,842 |  |  | — |  |  | Market comparable securities |  | Liquidity premium |  | 0-1% (1%) |  |  | — |
U.S. government |  | 18,025 |  |  | 22,511 |  |  | Market comparable securities |  | Liquidity premium |  | 0-1% (1%) |  |  | 0-1% (1%) |
State and political subdivisions |  | — |  |  | 4,616 |  |  | Market comparable securities |  | Liquidity premium |  | — |  |  | 1% |
Other foreign government |  | 5,006 |  |  | — |  |  | Market comparable securities |  | Liquidity premium |  | 1% |  |  | — |
Equity securities |  | 25,007 |  |  | — |  |  | Market comparable securities |  | Liquidity premium |  | 4% |  |  | — |
|  |  |  |  |  |  |  | EBITDA Multiple |  | 6.9x-12.3x (7.9x) |  |  | — |
Funds withheld at interest- embedded derivatives |  | 109,597 |  |  | 122,194 |  |  | Total return swap |  | Mortality |  | 0-100% (2%) |  |  | 0-100% (2%) |
|  |  |  |  |  |  |  | Lapse |  | 0-35% (10%) |  |  | 0-35% (9%) |
|  |  |  |  |  |  |  | Withdrawal |  | 0-5% (3%) |  |  | 0-5% (3%) |
|  |  |  |  |  |  |  | CVA |  | 0-5% (1%) |  |  | 0-5% (1%) |
|  |  |  |  |  |  |  | Crediting rate |  | 2-4% (2%) |  |  | 2-4% (2%) |
Longevity swaps |  | 47,789 |  |  | 40,659 |  |  | Discounted cash flow |  | Mortality |  | 0-100% (2%) |  |  | 0-100% (2%) |
|  |  |  |  |  |  |  | Mortality improvement |  | (10%)-10% (3%) |  |  | (10%)-10% (3%) |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Interest-sensitive contract liabilities- embedded derivatives- indexed annuities |  | 776,940 |  |  | 861,758 |  |  | Discounted cash flow |  | Mortality |  | 0-100% (2%) |  |  | 0-100% (2%) |
|  |  |  |  |  |  |  | Lapse |  | 0-35% (10%) |  |  | 0-35% (9%) |
|  |  |  |  |  |  |  | Withdrawal |  | 0-5% (3%) |  |  | 0-5% (3%) |
|  |  |  |  |  |  |  | Option budget projection |  | 2-4% (2%) |  |  | 2-4% (2%) |
Interest-sensitive contract liabilities- embedded derivatives- variable annuities |  | 167,925 |  |  | 152,470 |  |  | Discounted cash flow |  | Mortality |  | 0-100% (1%) |  |  | 0-100% (1%) |
|  |  |  |  |  |  |  | Lapse |  | 0-25% (5%) |  |  | 0-25% (5%) |
|  |  |  |  |  |  |  | Withdrawal |  | 0-7% (5%) |  |  | 0-7% (3%) |
|  |  |  |  |  |  |  | CVA |  | 0-5% (1%) |  |  | 0-5% (1%) |
|  |  |  |  |  |  |  | Long-term volatility |  | 0-27% (13%) |  |  | 0-27% (8%) |
Mortality swaps |  | 369 |  |  | 1,683 |  |  | Discounted cash flow |  | Mortality |  | 0-100% (1%) |  |  | 0-100% (1%) |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
For the year ended December 31, 2018: |  | Fixed maturity securities - available-for-sale
|  | Corporate |  | Canadian government |  | RMBS |  | ABS
Fair value, beginning of period |  | $ | 1,337,272 |  |  | $ | 593,942 |  |  | $ | 107,882 |  |  | $ | 123,474 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | (1,045 | ) |  | 13,965 |  |  | (129 | ) |  | 224 |
Investment related gains (losses), net |  | (4,651 | ) |  | — |  |  | 312 |  |  | 1,910 |
Included in other comprehensive income |  | (32,983 | ) |  | (79,783 | ) |  | (1,786 | ) |  | (1,344 | )
Purchases(1) |  | 509,134 |  |  | — |  |  | 52,279 |  |  | 42,120 |
Sales(1) |  | (106,005 | ) |  | — |  |  | (4,961 | ) |  | (462 | )
Settlements(1) |  | (273,898 | ) |  | — |  |  | (4,633 | ) |  | (57,476 | )
Transfers into Level 3 |  | 9,948 |  |  | — |  |  | 3,031 |  |  | 73,289 |
Transfers out of Level 3 |  | (106,847 | ) |  | — |  |  | (145,140 | ) |  | (86,163 | )
Fair value, end of period |  | $ | 1,330,925 |  |  | $ | 528,124 |  |  | $ | 6,855 |  |  | $ | 95,572 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | (998 | ) |  | $ | 13,965 |  |  | $ | 3 |  |  | $ | 209 |
Investment related gains (losses), net |  | (6,320 | ) |  | — |  |  | — |  |  | — |
For the year ended December 31, 2018 (continued): |  | Fixed maturity securities - available-for-sale
|  | CMBS |  | U.S. government |  | State and political subdivisions |  | Other foreign government
Fair value, beginning of period |  | $ | 3,234 |  |  | $ | 22,511 |  |  | $ | 41,203 |  |  | $ | 5,092 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | — |  |  | (423 | ) |  | 9 |  |  | — |
Investment related gains (losses), net |  | 1 |  |  | (208 | ) |  | — |  |  | — |
Included in other comprehensive income |  | (65 | ) |  | (436 | ) |  | 66 |  |  | (86 | )
Purchases(1) |  | — |  |  | 418 |  |  | — |  |  | — |
Sales(1) |  | (1,751 | ) |  | — |  |  | — |  |  | — |
Settlements(1) |  | (5 | ) |  | (3,837 | ) |  | (494 | ) |  | — |
Transfers into Level 3 |  | 1,752 |  |  | — |  |  | 9,859 |  |  | — |
Transfers out of Level 3 |  | (3,144 | ) |  | — |  |  | (40,441 | ) |  | — |
Fair value, end of period |  | $ | 22 |  |  | $ | 18,025 |  |  | $ | 10,202 |  |  | $ | 5,006 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | — |  |  | $ | (417 | ) |  | $ | 8 |  |  | $ | — |
For the year ended December 31, 2018 (continued): |  |  |  |  |  |  |  |  |  |  |  |
|  | Equity securities |  | Funds withheld at interest-embedded derivatives |  | Short-term investments |  | Other assets - longevity swaps |  | Interest-sensitive contract liabilities embedded derivatives |  | Other liabilities - mortality swaps
Fair value, beginning of period |  | $ | — |  |  | $ | 122,194 |  |  | $ | 3,096 |  |  | $ | 40,659 |  |  | $ | (1,014,228 | ) |  | $ | (1,683 | )
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | (12,600 | ) |  | (12,597 | ) |  | — |  |  | — |  |  | (15,455 | ) |  | — |
Interest credited |  | — |  |  | — |  |  | — |  |  | — |  |  | 27,590 |  |  | — |
Included in other comprehensive income |  | — |  |  | — |  |  | 1 |  |  | (2,085 | ) |  | — |  |  | — |
Other revenues |  | — |  |  | — |  |  | — |  |  | 9,215 |  |  | — |  |  | (386 | )
Purchases(1) |  | 13,962 |  |  | — |  |  | 2,624 |  |  | — |  |  | (19,182 | ) |  | — |
Sales(1) |  | (6,759 | ) |  | — |  |  | (250 | ) |  | — |  |  | — |  |  | — |
Settlements(1) |  | (48 | ) |  | — |  |  | (461 | ) |  | — |  |  | 76,410 |  |  | 1,700 |
Transfers into Level 3 |  | 38,905 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 |  | — |  |  | — |  |  | (2,782 | ) |  | — |  |  | — |  |  | — |
Fair value, end of period |  | $ | 33,460 |  |  | $ | 109,597 |  |  | $ | 2,228 |  |  | $ | 47,789 |  |  | $ | (944,865 | ) |  | $ | (369 | )
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | $ | (15,992 | ) |  | $ | (12,597 | ) |  | $ | — |  |  | $ | — |  |  | $ | (22,393 | ) |  | $ | — |
Other revenues |  | — |  |  | — |  |  | — |  |  | 9,215 |  |  | — |  |  | (386 | )
Interest credited |  | — |  |  | — |  |  | — |  |  | — |  |  | (48,819 | ) |  | — |
For the year ended December 31, 2017: |  | Fixed maturity securities - available-for-sale
|  | Corporate |  | Canadian government |  | RMBS |  | ABS
Fair value, beginning of period |  | $ | 1,272,253 |  |  | $ | 475,965 |  |  | $ | 160,291 |  |  | $ | 219,280 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | (1,429 | ) |  | 13,180 |  |  | (346 | ) |  | 1,776 |
Investment related gains (losses), net |  | 4,991 |  |  | — |  |  | 729 |  |  | 245 |
Included in other comprehensive income |  | (6,719 | ) |  | 104,797 |  |  | 2,341 |  |  | 7,044 |
Purchases(1) |  | 408,995 |  |  | — |  |  | 76,792 |  |  | 45,215 |
Sales(1) |  | (89,248 | ) |  | — |  |  | (28,043 | ) |  | — |
Settlements(1) |  | (285,958 | ) |  | — |  |  | (18,988 | ) |  | (87,328 | )
Transfers into Level 3 |  | 47,360 |  |  | — |  |  | 9,100 |  |  | 85,152 |
Transfers out of Level 3 |  | (12,973 | ) |  | — |  |  | (93,994 | ) |  | (147,910 | )
Fair value, end of period |  | $ | 1,337,272 |  |  | $ | 593,942 |  |  | $ | 107,882 |  |  | $ | 123,474 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | (1,457 | ) |  | $ | 13,180 |  |  | $ | (196 | ) |  | $ | 669 |
Investment related gains (losses), net |  | (5,389 | ) |  | — |  |  | (346 | ) |  | — |
For the year ended December 31, 2017 (continued): |  | Fixed maturity securities - available-for-sale
|  | CMBS |  | U.S. government |  | State and political subdivisions |  | Other foreign government
Fair value, beginning of period |  | $ | 21,145 |  |  | $ | 24,488 |  |  | $ | 41,666 |  |  | $ | 12,869 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | 709 |  |  | (461 | ) |  | (55 | ) |  | (1 | )
Investment related gains (losses), net |  | (595 | ) |  | — |  |  | — |  |  | — |
Included in other comprehensive income |  | (71 | ) |  | 19 |  |  | (15 | ) |  | (252 | )
Purchases(1) |  | — |  |  | 465 |  |  | — |  |  | 496 |
Sales(1) |  | (3,720 | ) |  | — |  |  | — |  |  | — |
Settlements(1) |  | (5,404 | ) |  | (2,000 | ) |  | (843 | ) |  | (672 | )
Transfers into Level 3 |  | 1,302 |  |  | — |  |  | 7,294 |  |  | — |
Transfers out of Level 3 |  | (10,132 | ) |  | — |  |  | (6,844 | ) |  | (7,348 | )
Fair value, end of period |  | $ | 3,234 |  |  | $ | 22,511 |  |  | $ | 41,203 |  |  | $ | 5,092 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | — |  |  | $ | (461 | ) |  | $ | (54 | ) |  | $ | (1 | )
For the year ended December 31, 2017 (continued): |  |  |  |  |  |  |  |  |  |
|  | Short-term investments |  | Funds withheld at interest-embedded derivatives |  | Other assets - longevity swaps |  | Interest-sensitive contract liabilities embedded derivatives |  | Other liabilities - mortality swaps
Fair value, beginning of period |  | $ | 3,346 |  |  | $ | (22,529 | ) |  | $ | 26,958 |  |  | $ | (990,308 | ) |  | $ | (2,462 | )
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | — |  |  | 144,723 |  |  | — |  |  | 32,166 |  |  | — |
Interest credited |  | — |  |  | — |  |  | — |  |  | (80,062 | ) |  | — |
Included in other comprehensive income |  | 11 |  |  | — |  |  | 4,343 |  |  | — |  |  | — |
Other revenues |  | — |  |  | — |  |  | 9,358 |  |  | — |  |  | (921 | )
Purchases(1) |  | 3,703 |  |  | — |  |  | — |  |  | (55,237 | ) |  | — |
Settlements(1) |  | (335 | ) |  | — |  |  | — |  |  | 79,213 |  |  | 1,700 |
Transfers out of Level 3 |  | (3,629 | ) |  | — |  |  | — |  |  | — |  |  | — |
Fair value, end of period |  | $ | 3,096 |  |  | $ | 122,194 |  |  | $ | 40,659 |  |  | $ | (1,014,228 | ) |  | $ | (1,683 | )
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | $ | — |  |  | $ | 144,723 |  |  | $ | — |  |  | $ | 23,472 |  |  | $ | — |
Other revenues |  | — |  |  | — |  |  | 9,358 |  |  | — |  |  | (921 | )
Interest credited |  | — |  |  | — |  |  | — |  |  | (159,276 | ) |  | — |
For the year ended December 31, 2016: |  | Fixed maturity securities - available-for-sale
|  | Corporate |  | Canadian government |  | RMBS |  | ABS
Fair value, beginning of period |  | $ | 1,226,970 |  |  | $ | 416,076 |  |  | $ | 330,649 |  |  | $ | 303,836 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | (2,399 | ) |  | 12,197 |  |  | (595 | ) |  | 801 |
Investment related gains (losses), net |  | (4,756 | ) |  | — |  |  | (2,153 | ) |  | 1,101 |
Included in other comprehensive income |  | 10,022 |  |  | 47,692 |  |  | (1,621 | ) |  | (2,696 | )
Purchases(1) |  | 312,720 |  |  | — |  |  | 103,553 |  |  | 138,522 |
Sales(1) |  | (60,399 | ) |  | — |  |  | (167,684 | ) |  | (38,681 | )
Settlements(1) |  | (195,016 | ) |  | — |  |  | (38,495 | ) |  | (61,770 | )
Transfers into Level 3 |  | 14,098 |  |  | — |  |  | 1,728 |  |  | 56,105 |
Transfers out of Level 3 |  | (28,987 | ) |  | — |  |  | (65,091 | ) |  | (177,938 | )
Fair value, end of period |  | $ | 1,272,253 |  |  | $ | 475,965 |  |  | $ | 160,291 |  |  | $ | 219,280 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | (2,343 | ) |  | $ | 12,197 |  |  | $ | (158 | ) |  | $ | 734 |
Investment related gains (losses), net |  | (817 | ) |  | — |  |  | (231 | ) |  | — |
For the year ended December 31, 2016 (continued): |  | Fixed maturity securities - available-for-sale
|  | CMBS |  | U.S. government |  | State and political subdivisions |  | Other foreign government
Fair value, beginning of period |  | $ | 68,563 |  |  | $ | 26,265 |  |  | $ | 38,342 |  |  | $ | 14,065 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | 1,677 |  |  | (487 | ) |  | 215 |  |  | — |
Investment related gains (losses), net |  | (876 | ) |  | — |  |  | — |  |  | — |
Included in other comprehensive income |  | (5,887 | ) |  | 39 |  |  | 962 |  |  | 110 |
Purchases(1) |  | 1,545 |  |  | 508 |  |  | 6,952 |  |  | — |
Sales(1) |  | (41,143 | ) |  | — |  |  | — |  |  | — |
Settlements(1) |  | (552 | ) |  | (1,837 | ) |  | (599 | ) |  | (1,306 | )
Transfers into Level 3 |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 |  | (2,182 | ) |  | — |  |  | (4,206 | ) |  | — |
Fair value, end of period |  | $ | 21,145 |  |  | $ | 24,488 |  |  | $ | 41,666 |  |  | $ | 12,869 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | 1,552 |  |  | $ | (487 | ) |  | $ | 215 |  |  | $ | — |
For the year ended December 31, 2016 (continued): |  |  |  |  |  |  |  |  |  |
|  | Short-term investments |  | Funds withheld at interest-embedded derivatives |  | Other assets - longevity swaps |  | Interest- sensitive contract liabilities embedded derivatives |  | Other liabilities - mortality swaps
Fair value, beginning of period |  | $ | — |  |  | $ | (76,698 | ) |  | $ | 14,996 |  |  | $ | (1,070,584 | ) |  | $ | (2,619 | )
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | — |  |  | 54,169 |  |  | — |  |  | 7,834 |  |  | — |
Interest credited |  | — |  |  | — |  |  | — |  |  | 10,709 |  |  | — |
Included in other comprehensive income |  | — |  |  | — |  |  | (1,133 | ) |  | — |  |  | — |
Other revenues |  | — |  |  | — |  |  | 13,095 |  |  | — |  |  | (172 | )
Purchases(1) |  | 3,365 |  |  | — |  |  | — |  |  | (12,725 | ) |  | — |
Settlements(1) |  | (19 | ) |  | — |  |  | — |  |  | 74,458 |  |  | 329 |
Fair value, end of period |  | $ | 3,346 |  |  | $ | (22,529 | ) |  | $ | 26,958 |  |  | $ | (990,308 | ) |  | $ | (2,462 | )
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | $ | — |  |  | $ | 54,169 |  |  | $ | — |  |  | $ | (4,579 | ) |  | $ | — |
Other revenues |  | — |  |  | — |  |  | 13,095 |  |  | — |  |  | (172 | )
Interest credited |  | — |  |  | — |  |  | — |  |  | (63,748 | ) |  | — |
(1) | The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
For the year ended December 31, 2018: |  | Fixed maturity securities - available-for-sale
|  | Corporate |  | Canadian government |  | RMBS |  | ABS
Fair value, beginning of period |  | $ | 1,337,272 |  |  | $ | 593,942 |  |  | $ | 107,882 |  |  | $ | 123,474 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | (1,045 | ) |  | 13,965 |  |  | (129 | ) |  | 224 |
Investment related gains (losses), net |  | (4,651 | ) |  | — |  |  | 312 |  |  | 1,910 |
Included in other comprehensive income |  | (32,983 | ) |  | (79,783 | ) |  | (1,786 | ) |  | (1,344 | )
Purchases(1) |  | 509,134 |  |  | — |  |  | 52,279 |  |  | 42,120 |
Sales(1) |  | (106,005 | ) |  | — |  |  | (4,961 | ) |  | (462 | )
Settlements(1) |  | (273,898 | ) |  | — |  |  | (4,633 | ) |  | (57,476 | )
Transfers into Level 3 |  | 9,948 |  |  | — |  |  | 3,031 |  |  | 73,289 |
Transfers out of Level 3 |  | (106,847 | ) |  | — |  |  | (145,140 | ) |  | (86,163 | )
Fair value, end of period |  | $ | 1,330,925 |  |  | $ | 528,124 |  |  | $ | 6,855 |  |  | $ | 95,572 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | (998 | ) |  | $ | 13,965 |  |  | $ | 3 |  |  | $ | 209 |
Investment related gains (losses), net |  | (6,320 | ) |  | — |  |  | — |  |  | — |
For the year ended December 31, 2018 (continued): |  | Fixed maturity securities - available-for-sale
|  | CMBS |  | U.S. government |  | State and political subdivisions |  | Other foreign government
Fair value, beginning of period |  | $ | 3,234 |  |  | $ | 22,511 |  |  | $ | 41,203 |  |  | $ | 5,092 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | — |  |  | (423 | ) |  | 9 |  |  | — |
Investment related gains (losses), net |  | 1 |  |  | (208 | ) |  | — |  |  | — |
Included in other comprehensive income |  | (65 | ) |  | (436 | ) |  | 66 |  |  | (86 | )
Purchases(1) |  | — |  |  | 418 |  |  | — |  |  | — |
Sales(1) |  | (1,751 | ) |  | — |  |  | — |  |  | — |
Settlements(1) |  | (5 | ) |  | (3,837 | ) |  | (494 | ) |  | — |
Transfers into Level 3 |  | 1,752 |  |  | — |  |  | 9,859 |  |  | — |
Transfers out of Level 3 |  | (3,144 | ) |  | — |  |  | (40,441 | ) |  | — |
Fair value, end of period |  | $ | 22 |  |  | $ | 18,025 |  |  | $ | 10,202 |  |  | $ | 5,006 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | — |  |  | $ | (417 | ) |  | $ | 8 |  |  | $ | — |
For the year ended December 31, 2018 (continued): |  |  |  |  |  |  |  |  |  |  |  |
|  | Equity securities |  | Funds withheld at interest-embedded derivatives |  | Short-term investments |  | Other assets - longevity swaps |  | Interest-sensitive contract liabilities embedded derivatives |  | Other liabilities - mortality swaps
Fair value, beginning of period |  | $ | — |  |  | $ | 122,194 |  |  | $ | 3,096 |  |  | $ | 40,659 |  |  | $ | (1,014,228 | ) |  | $ | (1,683 | )
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | (12,600 | ) |  | (12,597 | ) |  | — |  |  | — |  |  | (15,455 | ) |  | — |
Interest credited |  | — |  |  | — |  |  | — |  |  | — |  |  | 27,590 |  |  | — |
Included in other comprehensive income |  | — |  |  | — |  |  | 1 |  |  | (2,085 | ) |  | — |  |  | — |
Other revenues |  | — |  |  | — |  |  | — |  |  | 9,215 |  |  | — |  |  | (386 | )
Purchases(1) |  | 13,962 |  |  | — |  |  | 2,624 |  |  | — |  |  | (19,182 | ) |  | — |
Sales(1) |  | (6,759 | ) |  | — |  |  | (250 | ) |  | — |  |  | — |  |  | — |
Settlements(1) |  | (48 | ) |  | — |  |  | (461 | ) |  | — |  |  | 76,410 |  |  | 1,700 |
Transfers into Level 3 |  | 38,905 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 |  | — |  |  | — |  |  | (2,782 | ) |  | — |  |  | — |  |  | — |
Fair value, end of period |  | $ | 33,460 |  |  | $ | 109,597 |  |  | $ | 2,228 |  |  | $ | 47,789 |  |  | $ | (944,865 | ) |  | $ | (369 | )
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | $ | (15,992 | ) |  | $ | (12,597 | ) |  | $ | — |  |  | $ | — |  |  | $ | (22,393 | ) |  | $ | — |
Other revenues |  | — |  |  | — |  |  | — |  |  | 9,215 |  |  | — |  |  | (386 | )
Interest credited |  | — |  |  | — |  |  | — |  |  | — |  |  | (48,819 | ) |  | — |
For the year ended December 31, 2017: |  | Fixed maturity securities - available-for-sale
|  | Corporate |  | Canadian government |  | RMBS |  | ABS
Fair value, beginning of period |  | $ | 1,272,253 |  |  | $ | 475,965 |  |  | $ | 160,291 |  |  | $ | 219,280 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | (1,429 | ) |  | 13,180 |  |  | (346 | ) |  | 1,776 |
Investment related gains (losses), net |  | 4,991 |  |  | — |  |  | 729 |  |  | 245 |
Included in other comprehensive income |  | (6,719 | ) |  | 104,797 |  |  | 2,341 |  |  | 7,044 |
Purchases(1) |  | 408,995 |  |  | — |  |  | 76,792 |  |  | 45,215 |
Sales(1) |  | (89,248 | ) |  | — |  |  | (28,043 | ) |  | — |
Settlements(1) |  | (285,958 | ) |  | — |  |  | (18,988 | ) |  | (87,328 | )
Transfers into Level 3 |  | 47,360 |  |  | — |  |  | 9,100 |  |  | 85,152 |
Transfers out of Level 3 |  | (12,973 | ) |  | — |  |  | (93,994 | ) |  | (147,910 | )
Fair value, end of period |  | $ | 1,337,272 |  |  | $ | 593,942 |  |  | $ | 107,882 |  |  | $ | 123,474 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | (1,457 | ) |  | $ | 13,180 |  |  | $ | (196 | ) |  | $ | 669 |
Investment related gains (losses), net |  | (5,389 | ) |  | — |  |  | (346 | ) |  | — |
For the year ended December 31, 2017 (continued): |  | Fixed maturity securities - available-for-sale
|  | CMBS |  | U.S. government |  | State and political subdivisions |  | Other foreign government
Fair value, beginning of period |  | $ | 21,145 |  |  | $ | 24,488 |  |  | $ | 41,666 |  |  | $ | 12,869 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | 709 |  |  | (461 | ) |  | (55 | ) |  | (1 | )
Investment related gains (losses), net |  | (595 | ) |  | — |  |  | — |  |  | — |
Included in other comprehensive income |  | (71 | ) |  | 19 |  |  | (15 | ) |  | (252 | )
Purchases(1) |  | — |  |  | 465 |  |  | — |  |  | 496 |
Sales(1) |  | (3,720 | ) |  | — |  |  | — |  |  | — |
Settlements(1) |  | (5,404 | ) |  | (2,000 | ) |  | (843 | ) |  | (672 | )
Transfers into Level 3 |  | 1,302 |  |  | — |  |  | 7,294 |  |  | — |
Transfers out of Level 3 |  | (10,132 | ) |  | — |  |  | (6,844 | ) |  | (7,348 | )
Fair value, end of period |  | $ | 3,234 |  |  | $ | 22,511 |  |  | $ | 41,203 |  |  | $ | 5,092 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | — |  |  | $ | (461 | ) |  | $ | (54 | ) |  | $ | (1 | )
For the year ended December 31, 2017 (continued): |  |  |  |  |  |  |  |  |  |
|  | Short-term investments |  | Funds withheld at interest-embedded derivatives |  | Other assets - longevity swaps |  | Interest-sensitive contract liabilities embedded derivatives |  | Other liabilities - mortality swaps
Fair value, beginning of period |  | $ | 3,346 |  |  | $ | (22,529 | ) |  | $ | 26,958 |  |  | $ | (990,308 | ) |  | $ | (2,462 | )
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | — |  |  | 144,723 |  |  | — |  |  | 32,166 |  |  | — |
Interest credited |  | — |  |  | — |  |  | — |  |  | (80,062 | ) |  | — |
Included in other comprehensive income |  | 11 |  |  | — |  |  | 4,343 |  |  | — |  |  | — |
Other revenues |  | — |  |  | — |  |  | 9,358 |  |  | — |  |  | (921 | )
Purchases(1) |  | 3,703 |  |  | — |  |  | — |  |  | (55,237 | ) |  | — |
Settlements(1) |  | (335 | ) |  | — |  |  | — |  |  | 79,213 |  |  | 1,700 |
Transfers out of Level 3 |  | (3,629 | ) |  | — |  |  | — |  |  | — |  |  | — |
Fair value, end of period |  | $ | 3,096 |  |  | $ | 122,194 |  |  | $ | 40,659 |  |  | $ | (1,014,228 | ) |  | $ | (1,683 | )
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | $ | — |  |  | $ | 144,723 |  |  | $ | — |  |  | $ | 23,472 |  |  | $ | — |
Other revenues |  | — |  |  | — |  |  | 9,358 |  |  | — |  |  | (921 | )
Interest credited |  | — |  |  | — |  |  | — |  |  | (159,276 | ) |  | — |
For the year ended December 31, 2016: |  | Fixed maturity securities - available-for-sale
|  | Corporate |  | Canadian government |  | RMBS |  | ABS
Fair value, beginning of period |  | $ | 1,226,970 |  |  | $ | 416,076 |  |  | $ | 330,649 |  |  | $ | 303,836 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | (2,399 | ) |  | 12,197 |  |  | (595 | ) |  | 801 |
Investment related gains (losses), net |  | (4,756 | ) |  | — |  |  | (2,153 | ) |  | 1,101 |
Included in other comprehensive income |  | 10,022 |  |  | 47,692 |  |  | (1,621 | ) |  | (2,696 | )
Purchases(1) |  | 312,720 |  |  | — |  |  | 103,553 |  |  | 138,522 |
Sales(1) |  | (60,399 | ) |  | — |  |  | (167,684 | ) |  | (38,681 | )
Settlements(1) |  | (195,016 | ) |  | — |  |  | (38,495 | ) |  | (61,770 | )
Transfers into Level 3 |  | 14,098 |  |  | — |  |  | 1,728 |  |  | 56,105 |
Transfers out of Level 3 |  | (28,987 | ) |  | — |  |  | (65,091 | ) |  | (177,938 | )
Fair value, end of period |  | $ | 1,272,253 |  |  | $ | 475,965 |  |  | $ | 160,291 |  |  | $ | 219,280 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | (2,343 | ) |  | $ | 12,197 |  |  | $ | (158 | ) |  | $ | 734 |
Investment related gains (losses), net |  | (817 | ) |  | — |  |  | (231 | ) |  | — |
For the year ended December 31, 2016 (continued): |  | Fixed maturity securities - available-for-sale
|  | CMBS |  | U.S. government |  | State and political subdivisions |  | Other foreign government
Fair value, beginning of period |  | $ | 68,563 |  |  | $ | 26,265 |  |  | $ | 38,342 |  |  | $ | 14,065 |
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | 1,677 |  |  | (487 | ) |  | 215 |  |  | — |
Investment related gains (losses), net |  | (876 | ) |  | — |  |  | — |  |  | — |
Included in other comprehensive income |  | (5,887 | ) |  | 39 |  |  | 962 |  |  | 110 |
Purchases(1) |  | 1,545 |  |  | 508 |  |  | 6,952 |  |  | — |
Sales(1) |  | (41,143 | ) |  | — |  |  | — |  |  | — |
Settlements(1) |  | (552 | ) |  | (1,837 | ) |  | (599 | ) |  | (1,306 | )
Transfers into Level 3 |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 |  | (2,182 | ) |  | — |  |  | (4,206 | ) |  | — |
Fair value, end of period |  | $ | 21,145 |  |  | $ | 24,488 |  |  | $ | 41,666 |  |  | $ | 12,869 |
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |
Investment income, net of related expenses |  | $ | 1,552 |  |  | $ | (487 | ) |  | $ | 215 |  |  | $ | — |
For the year ended December 31, 2016 (continued): |  |  |  |  |  |  |  |  |  |
|  | Short-term investments |  | Funds withheld at interest-embedded derivatives |  | Other assets - longevity swaps |  | Interest- sensitive contract liabilities embedded derivatives |  | Other liabilities - mortality swaps
Fair value, beginning of period |  | $ | — |  |  | $ | (76,698 | ) |  | $ | 14,996 |  |  | $ | (1,070,584 | ) |  | $ | (2,619 | )
Total gains/losses (realized/unrealized) |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | — |  |  | 54,169 |  |  | — |  |  | 7,834 |  |  | — |
Interest credited |  | — |  |  | — |  |  | — |  |  | 10,709 |  |  | — |
Included in other comprehensive income |  | — |  |  | — |  |  | (1,133 | ) |  | — |  |  | — |
Other revenues |  | — |  |  | — |  |  | 13,095 |  |  | — |  |  | (172 | )
Purchases(1) |  | 3,365 |  |  | — |  |  | — |  |  | (12,725 | ) |  | — |
Settlements(1) |  | (19 | ) |  | — |  |  | — |  |  | 74,458 |  |  | 329 |
Fair value, end of period |  | $ | 3,346 |  |  | $ | (22,529 | ) |  | $ | 26,958 |  |  | $ | (990,308 | ) |  | $ | (2,462 | )
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period |  |  |  |  |  |  |  |  |  |
Included in earnings, net: |  |  |  |  |  |  |  |  |  |
Investment related gains (losses), net |  | $ | — |  |  | $ | 54,169 |  |  | $ | — |  |  | $ | (4,579 | ) |  | $ | — |
Other revenues |  | — |  |  | — |  |  | 13,095 |  |  | — |  |  | (172 | )
Interest credited |  | — |  |  | — |  |  | — |  |  | (63,748 | ) |  | — |
(1) | The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
Fair Value Assets Measured On Nonrecurring Basis [Text Block] | Nonrecurring Fair Value Measurements The following table presents information for financial instruments measured at an estimated fair value on a nonrecurring basis during the periods presented and still held at the reporting date (for example, when there is evidence of impairment). The estimated fair values for these financial instruments were determined using significant unobservable inputs (Level 3).
|  | Carrying Value After Measurement |  | Net Investment Gains (Losses)
|  | At December 31, |  | Years ended December 31,
(dollars in thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Limited partnership interests(1) |  | $ | 4,596 |  |  | $ | 4,656 |  |  | $ | (3,200 | ) |  | $ | (7,204 | )
Private equities(2) |  | — |  |  | 106 |  |  | — |  |  | (531 | )
(1) | The impaired limited partnership interests presented above were accounted for using the cost method. Impairments on these cost method investments were recognized at estimated fair value determined using the net asset values of the Company’s ownership interest as provided in the financial statements of the investees. The market for these investments has limited activity and price transparency.
(2) | The fair value of the Company’s private equity investments is based on external valuation models.
Financial Instruments Carrying Amounts And Estimated Fair Value [Table Text Block] | The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments, which were not measured at fair value on a recurring basis, as of December 31, 2018 and 2017 (dollars in thousands). This table excludes any payables or receivables for collateral under repurchase agreements and other transactions. The estimated fair value of the excluded amount approximates carrying value as they equal the amount of cash collateral received/paid.
|  |  |  | Estimated Fair |  | Fair Value Measurement Using:
December 31, 2018: |  | Carrying Value (1) |  | Value |  | Level 1 |  | Level 2 |  | Level 3 |  | NAV
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate |  | $ | 4,966,298 |  |  | $ | 4,917,416 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,917,416 |  |  | $ | — |
Policy loans |  | 1,344,980 |  |  | 1,344,980 |  |  | — |  |  | 1,344,980 |  |  | — |  |  | — |
Funds withheld at interest |  | 5,655,055 |  |  | 5,802,518 |  |  | — |  |  | — |  |  | 5,802,518 |  |  | — |
Cash and cash equivalents |  | 1,404,566 |  |  | 1,404,566 |  |  | 1,404,566 |  |  | — |  |  | — |  |  | — |
Short-term investments |  | 36,607 |  |  | 36,607 |  |  | 36,607 |  |  | — |  |  | — |  |  | — |
Other invested assets |  | 945,731 |  |  | 941,449 |  |  | 4,640 |  |  | 83,203 |  |  | 477,214 |  |  | 376,392 |
Accrued investment income |  | 427,893 |  |  | 427,893 |  |  | — |  |  | 427,893 |  |  | — |  |  | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Interest-sensitive contract liabilities |  | $ | 14,547,436 |  |  | $ | 14,611,011 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,611,011 |  |  | $ | — |
Long-term debt |  | 2,787,873 |  |  | 2,752,047 |  |  | — |  |  | — |  |  | 2,752,047 |  |  | — |
Collateral finance and securitization notes |  | 681,961 |  |  | 626,731 |  |  | — |  |  | — |  |  | 626,731 |  |  | — |
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate |  | $ | 4,400,533 |  |  | $ | 4,477,654 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,477,654 |  |  | $ | — |
Policy loans |  | 1,357,624 |  |  | 1,357,624 |  |  | — |  |  | 1,357,624 |  |  | — |  |  | — |
Funds withheld at interest |  | 5,955,092 |  |  | 6,275,623 |  |  | — |  |  | — |  |  | 6,275,623 |  |  | — |
Cash and cash equivalents |  | 946,736 |  |  | 946,736 |  |  | 946,736 |  |  | — |  |  | — |  |  | — |
Short-term investments |  | 42,558 |  |  | 42,558 |  |  | 42,558 |  |  | — |  |  | — |  |  | — |
Other invested assets |  | 690,198 |  |  | 718,282 |  |  | 28,540 |  |  | 67,778 |  |  | 286,839 |  |  | 335,125 |
Accrued investment income |  | 392,721 |  |  | 392,721 |  |  | — |  |  | 392,721 |  |  | — |  |  | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Interest-sensitive contract liabilities |  | $ | 12,683,872 |  |  | $ | 12,917,243 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,917,243 |  |  | $ | — |
Long-term debt |  | 2,788,365 |  |  | 2,959,912 |  |  | — |  |  | — |  |  | 2,959,912 |  |  | — |
Collateral finance and securitization notes |  | 783,938 |  |  | 722,145 |  |  | — |  |  | — |  |  | 722,145 |  |  | — |
(1) | Carrying values presented herein may differ from those in the Company’s consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.

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