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v3.20.4

Investments (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | $ 6,317,164 | $ 5,562,550 |
Total at end of period | 6,661,596 | 5,737,892 |
Assets held by insurance regulatory requirements | 14,100 | 13,900 |
Assets held in trust for the benefit of contractual counterparties | $ 165,900 | 88,900 |
Collateral pledged to principal balance of FHLB advance (as a percent) | 102.00% |  |
Collateral pledged for FHLB advance | $ 163,900 |  |
Maturities, Amortized Cost [Abstract] |  |  |
Due in one year or less | 390,510 |  |
Due after one year through five years | 1,945,158 |  |
Due after five years through ten years | 1,280,760 |  |
Due after ten years | 1,448,209 |  |
Total debt securities with single maturity date | 5,064,637 |  |
Total at end of period | 6,317,164 | 5,562,550 |
Maturities, Fair Value [Abstract] |  |  |
Due in one year or less | 393,286 |  |
Due after one year through five years | 2,033,183 |  |
Due after five years through ten years | 1,402,640 |  |
Due after ten years | 1,556,643 |  |
Total debt securities with single maturity date | 5,385,752 |  |
Total at end of period | 6,661,596 | 5,737,892 |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity securities, cost | 17,522 | 17,188 |
Equity securities, at fair value (cost, 2020 - $17,522; 2019 - $17,188) | 18,215 | 17,328 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 300,911 | 624,334 |
12 months or greater | 80,269 | 379,411 |
Total | 381,180 | 1,003,745 |
Less than 12 months | (3,827) | (5,426) |
12 months or greater | (832) | (4,476) |
Total | $ (4,659) | $ (9,902) |
Number of securities in unrealized loss position | security | 109 | 217 |
For securities in an unrealized loss position, percentage of fair value to amortized cost (in hundredths) | 99.00% |  |
For securities in an unrealized loss position, percentage backed by the U.S. Government (in hundredths) | 27.00% |  |
Total fixed income securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | $ 6,317,164 | $ 5,562,550 |
Allowance for Expected Credit Loss | (49) |  |
Gross Unrealized Gains | 349,140 | 185,244 |
Gross Unrealized Losses | (4,659) | (9,902) |
Total at end of period | 6,661,596 | 5,737,892 |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 6,317,164 | 5,562,550 |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 6,661,596 | 5,737,892 |
Proceeds from sale of fixed income securities available for sale | 803,400 | 228,100 | $ 365,600
Gross realized gains | 21,300 | 7,100 | 700
Gross realized losses | 8,800 | 3,500 | 3,800
Debt Securities, Available for Sale, Impairment Charges Intent To Sell No Allowance Previously Recorded Recognized in Net Realized Investment Gains Losses | 300 |  |
Increase in credit allowance for the period | 49 |  |
Recognized other than temporary impairments |  | 100 | $ 1,800
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 264,531 | 195,176 |
Allowance for Expected Credit Loss | 0 |  |
Gross Unrealized Gains | 1,164 | 1,237 |
Gross Unrealized Losses | (2) | (210) |
Total at end of period | 265,693 | 196,203 |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 264,531 | 195,176 |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 265,693 | 196,203 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 2,690 | 57,301 |
12 months or greater | 0 | 5,806 |
Total | 2,690 | 63,107 |
Less than 12 months | (2) | (200) |
12 months or greater | 0 | (10) |
Total | (2) | (210) |
Obligations of U.S. states and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 2,083,568 | 1,555,394 |
Allowance for Expected Credit Loss | 0 |  |
Gross Unrealized Gains | 166,557 | 99,328 |
Gross Unrealized Losses | (256) | (857) |
Total at end of period | 2,249,869 | 1,653,865 |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 2,083,568 | 1,555,394 |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 2,249,869 | 1,653,865 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 31,416 | 74,859 |
12 months or greater | 0 | 6,957 |
Total | 31,416 | 81,816 |
Less than 12 months | (256) | (847) |
12 months or greater | 0 | (10) |
Total | (256) | (857) |
Corporate debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 2,690,860 | 2,711,910 |
Allowance for Expected Credit Loss | 0 |  |
Gross Unrealized Gains | 155,156 | 76,220 |
Gross Unrealized Losses | (1,728) | (3,008) |
Total at end of period | 2,844,288 | 2,785,122 |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 2,690,860 | 2,711,910 |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 2,844,288 | 2,785,122 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 44,968 | 221,357 |
12 months or greater | 0 | 43,505 |
Total | 44,968 | 264,862 |
Less than 12 months | (1,728) | (2,847) |
12 months or greater | 0 | (161) |
Total | (1,728) | (3,008) |
ABS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 203,807 | 227,376 |
Allowance for Expected Credit Loss | (49) |  |
Gross Unrealized Gains | 2,946 | 2,466 |
Gross Unrealized Losses | (18) | (178) |
Total at end of period | 206,686 | 229,664 |
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date | 203,807 |  |
Total at end of period | 203,807 | 227,376 |
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date | 206,686 |  |
Total at end of period | 206,686 | 229,664 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 14,929 | 21,542 |
12 months or greater | 0 | 3,851 |
Total | 14,929 | 25,393 |
Less than 12 months | (18) | (118) |
12 months or greater | 0 | (60) |
Total | (18) | (178) |
RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 425,532 | 271,384 |
Allowance for Expected Credit Loss | 0 |  |
Gross Unrealized Gains | 6,472 | 429 |
Gross Unrealized Losses | (838) | (3,227) |
Total at end of period | 431,166 | 268,586 |
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date | 425,532 |  |
Total at end of period | 425,532 | 271,384 |
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date | 431,166 |  |
Total at end of period | 431,166 | 268,586 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 98,409 | 105,443 |
12 months or greater | 3,566 | 110,452 |
Total | 101,975 | 215,895 |
Less than 12 months | (773) | (461) |
12 months or greater | (65) | (2,766) |
Total | (838) | (3,227) |
CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 312,572 | 274,234 |
Allowance for Expected Credit Loss | 0 |  |
Gross Unrealized Gains | 16,055 | 5,531 |
Gross Unrealized Losses | (1,125) | (779) |
Total at end of period | 327,502 | 278,986 |
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date | 312,572 |  |
Total at end of period | 312,572 | 274,234 |
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date | 327,502 |  |
Total at end of period | 327,502 | 278,986 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 13,212 | 62,388 |
12 months or greater | 2,799 | 11,852 |
Total | 16,011 | 74,240 |
Less than 12 months | (789) | (728) |
12 months or greater | (336) | (51) |
Total | (1,125) | (779) |
CLOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 310,616 | 327,076 |
Allowance for Expected Credit Loss | 0 |  |
Gross Unrealized Gains | 566 | 33 |
Gross Unrealized Losses | (692) | (1,643) |
Total at end of period | 310,490 | 325,466 |
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date | 310,616 |  |
Total at end of period | 310,616 | 327,076 |
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date | 310,490 |  |
Total at end of period | 310,490 | 325,466 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 95,287 | 81,444 |
12 months or greater | 73,904 | 196,988 |
Total | 169,191 | 278,432 |
Less than 12 months | (261) | (225) |
12 months or greater | (431) | (1,418) |
Total | (692) | (1,643) |
Debt securities issued by foreign sovereign governments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 4,485 |  |
Allowance for Expected Credit Loss | 0 |  |
Gross Unrealized Gains | 224 |  |
Gross Unrealized Losses | 0 |  |
Total at end of period | 4,709 |  |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 4,485 |  |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 4,709 |  |
Other investments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 21,193 |  |
Allowance for Expected Credit Loss | 0 |  |
Gross Unrealized Gains | 0 |  |
Gross Unrealized Losses | 0 |  |
Total at end of period | 21,193 |  |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 21,193 |  |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 21,193 |  |
Equity securities |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity securities, cost | 17,522 | 17,188 |
Gross gains | 695 | 154 |
Gross losses | (2) | (14) |
Equity securities, at fair value (cost, 2020 - $17,522; 2019 - $17,188) | 18,215 | 17,328 |
Proceeds from sale of equity securities | 25,700 | 1,700 |
Gross realized gains on equity securities | 1,800 | 1,600 |
Gross realized losses on equity securities | 400 | 0 |
Recognized net gains (losses) on equity securities still held | $ 600 | $ 200 |

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