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Investments (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | $ 5,562,550,000 | $ 5,196,784,000 |
Total at end of period | 5,737,892,000 | 5,151,987,000 |
Other than temporary impairments recorded in other comprehensive (loss) income | 0 | 0 |
Assets held by insurance regulatory requirements | 13,900,000 | 13,500,000 |
Assets held in trust for the benefit of contractual counterparties | $ 89,900,000 | 26,300,000 |
Collateral, principal balance of FHLB (as a percent) | 102.00% |  |
Collateral, principal balance of FHLB | $ 165,700,000 |  |
Maturities, Amortized Cost [Abstract] |  |  |
Due in one year or less | 425,739,000 |  |
Due after one year through five years | 1,911,433,000 |  |
Due after five years through ten years | 1,031,056,000 |  |
Due after ten years | 1,094,252,000 |  |
Total debt securities with single maturity date | 4,462,480,000 |  |
Total at end of period | 5,562,550,000 | 5,196,784,000 |
Maturities, Fair Value [Abstract] |  |  |
Due in one year or less | 427,616,000 |  |
Due after one year through five years | 1,952,278,000 |  |
Due after five years through ten years | 1,088,012,000 |  |
Due after ten years | 1,167,284,000 |  |
Total debt securities with single maturity date | 4,635,190,000 |  |
Total at end of period | 5,737,892,000 | 5,151,987,000 |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity securities, cost | 17,188,000 | 3,993,000 |
Equity securities, at fair value (cost, 2019 - $17,188; 2018 - $3,993) | 17,328,000 | 3,932,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 624,334,000 | 2,026,193,000 |
12 months or greater | 379,411,000 | 1,554,704,000 |
Total | 1,003,745,000 | 3,580,897,000 |
Less than 12 months | (5,426,000) | (28,520,000) |
12 months or greater | (4,476,000) | (49,384,000) |
Total | $ (9,902,000) | $ (77,904,000) |
Number of securities in unrealized loss position | security | 217 | 721 |
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) | 28.00% |  |
Total fixed income securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | $ 5,562,550,000 | $ 5,196,784,000 |
Gross Unrealized Gains | 185,244,000 | 33,107,000 |
Gross Unrealized Losses | (9,902,000) | (77,904,000) |
Total at end of period | 5,737,892,000 | 5,151,987,000 |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 5,562,550,000 | 5,196,784,000 |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 5,737,892,000 | 5,151,987,000 |
Proceeds from sale of fixed income securities available for sale | 228,100,000 | 365,600,000 | $ 246,900,000
Gross realized gains | 7,100,000 | 700,000 | 1,600,000
Gross realized losses | 3,500,000 | 3,800,000 | 1,400,000
Recognized other than temporary impairments | 100,000 | 1,800,000 | $ 0
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 | 195,176,000 | 167,655,000 |
Gross Unrealized Gains | 1,237,000 | 597,000 |
Gross Unrealized Losses | (210,000) | (1,076,000) |
Total at end of period | 196,203,000 | 167,176,000 |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 195,176,000 | 167,655,000 |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 196,203,000 | 167,176,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 57,301,000 | 23,710,000 |
12 months or greater | 5,806,000 | 69,146,000 |
Total | 63,107,000 | 92,856,000 |
Less than 12 months | (200,000) | (15,000) |
12 months or greater | (10,000) | (1,061,000) |
Total | (210,000) | (1,076,000) |
Obligations of U.S. states and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 1,555,394,000 | 1,701,826,000 |
Gross Unrealized Gains | 99,328,000 | 29,259,000 |
Gross Unrealized Losses | (857,000) | (10,985,000) |
Total at end of period | 1,653,865,000 | 1,720,100,000 |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 1,555,394,000 | 1,701,826,000 |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 1,653,865,000 | 1,720,100,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 74,859,000 | 316,655,000 |
12 months or greater | 6,957,000 | 358,086,000 |
Total | 81,816,000 | 674,741,000 |
Less than 12 months | (847,000) | (3,875,000) |
12 months or greater | (10,000) | (7,110,000) |
Total | (857,000) | (10,985,000) |
Corporate debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 2,711,910,000 | 2,439,173,000 |
Gross Unrealized Gains | 76,220,000 | 2,103,000 |
Gross Unrealized Losses | (3,008,000) | (40,514,000) |
Total at end of period | 2,785,122,000 | 2,400,762,000 |
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period | 2,711,910,000 | 2,439,173,000 |
Maturities, Fair Value [Abstract] |  |  |
Total at end of period | 2,785,122,000 | 2,400,762,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 221,357,000 | 1,272,279,000 |
12 months or greater | 43,505,000 | 785,627,000 |
Total | 264,862,000 | 2,057,906,000 |
Less than 12 months | (2,847,000) | (18,130,000) |
12 months or greater | (161,000) | (22,384,000) |
Total | (3,008,000) | (40,514,000) |
ABS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 227,376,000 | 111,953,000 |
Gross Unrealized Gains | 2,466,000 | 226,000 |
Gross Unrealized Losses | (178,000) | (146,000) |
Total at end of period | 229,664,000 | 112,033,000 |
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date | 227,376,000 |  |
Total at end of period | 227,376,000 | 111,953,000 |
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date | 229,664,000 |  |
Total at end of period | 229,664,000 | 112,033,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 21,542,000 | 51,324,000 |
12 months or greater | 3,851,000 | 0 |
Total | 25,393,000 | 51,324,000 |
Less than 12 months | (118,000) | (146,000) |
12 months or greater | (60,000) | 0 |
Total | (178,000) | (146,000) |
RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 271,384,000 | 189,238,000 |
Gross Unrealized Gains | 429,000 | 32,000 |
Gross Unrealized Losses | (3,227,000) | (10,309,000) |
Total at end of period | 268,586,000 | 178,961,000 |
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date | 271,384,000 |  |
Total at end of period | 271,384,000 | 189,238,000 |
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date | 268,586,000 |  |
Total at end of period | 268,586,000 | 178,961,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 105,443,000 | 24,000 |
12 months or greater | 110,452,000 | 178,573,000 |
Total | 215,895,000 | 178,597,000 |
Less than 12 months | (461,000) | 0 |
12 months or greater | (2,766,000) | (10,309,000) |
Total | (3,227,000) | (10,309,000) |
CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 274,234,000 | 276,352,000 |
Gross Unrealized Gains | 5,531,000 | 888,000 |
Gross Unrealized Losses | (779,000) | (9,580,000) |
Total at end of period | 278,986,000 | 267,660,000 |
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date | 274,234,000 |  |
Total at end of period | 274,234,000 | 276,352,000 |
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date | 278,986,000 |  |
Total at end of period | 278,986,000 | 267,660,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 62,388,000 | 65,704,000 |
12 months or greater | 11,852,000 | 163,272,000 |
Total | 74,240,000 | 228,976,000 |
Less than 12 months | (728,000) | (1,060,000) |
12 months or greater | (51,000) | (8,520,000) |
Total | (779,000) | (9,580,000) |
CLOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total at end of period | 327,076,000 | 310,587,000 |
Gross Unrealized Gains | 33,000 | 2,000 |
Gross Unrealized Losses | (1,643,000) | (5,294,000) |
Total at end of period | 325,466,000 | 305,295,000 |
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date | 327,076,000 |  |
Total at end of period | 327,076,000 | 310,587,000 |
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date | 325,466,000 |  |
Total at end of period | 325,466,000 | 305,295,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months | 81,444,000 | 296,497,000 |
12 months or greater | 196,988,000 | 0 |
Total | 278,432,000 | 296,497,000 |
Less than 12 months | (225,000) | (5,294,000) |
12 months or greater | (1,418,000) | 0 |
Total | (1,643,000) | (5,294,000) |
Equity securities |  |  |
Equity Securities, FV-NI, Gain (Loss) [Abstract] |  |  |
Equity securities, cost | 17,188,000 | 3,993,000 |
Gross gains | 154,000 | 11,000 |
Gross losses | (14,000) | (72,000) |
Equity securities, at fair value (cost, 2019 - $17,188; 2018 - $3,993) | 17,328,000 | 3,932,000 |
Proceeds from sale of equity securities | 1,700,000 | 4,900,000 |
Gross realized gains on equity securities | 1,600,000 | 3,700,000 |
Recognized net losses on equity securities still held | $ 201,000 | $ 84,000 |

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