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Schedule I Summary Of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | $ 6,475,530 |
Allowance for Credit Losses | (948) |
Fair Value | 6,845,941 |
Amount Reflected on the Consolidated Balance Sheet | 6,845,941 |
Reinvested Cash Collateral Held Under Securities Lending Agreements | 15,587 | $ 25,561
Loaned securities | 57,499 | $ 66,442
US government and agency securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 176,033 |
Allowance for Credit Losses | 0 |
Fair Value | 174,099 |
Amount Reflected on the Consolidated Balance Sheet | 174,099 |
State and municipal obligations |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 149,258 |
Allowance for Credit Losses | 0 |
Fair Value | 165,271 |
Amount Reflected on the Consolidated Balance Sheet | 165,271 |
Corporate bonds and notes |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 2,832,350 |
Allowance for Credit Losses | (948) |
Fair Value | 3,078,415 |
Amount Reflected on the Consolidated Balance Sheet | 3,078,415 |
RMBS |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 799,814 |
Allowance for Credit Losses | 0 |
Fair Value | 833,939 |
Amount Reflected on the Consolidated Balance Sheet | 833,939 |
CMBS |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 645,071 |
Allowance for Credit Losses | 0 |
Fair Value | 681,265 |
Amount Reflected on the Consolidated Balance Sheet | 681,265 |
CLO |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 569,173 |
Allowance for Credit Losses | 0 |
Fair Value | 568,558 |
Amount Reflected on the Consolidated Balance Sheet | 568,558 |
Other ABS |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 249,988 |
Allowance for Credit Losses | 0 |
Fair Value | 252,457 |
Amount Reflected on the Consolidated Balance Sheet | 252,457 |
Foreign government and agency securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 5,100 |
Allowance for Credit Losses | 0 |
Fair Value | 5,438 |
Amount Reflected on the Consolidated Balance Sheet | 5,438 |
Total fixed-maturities available for sale |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 5,426,787 |
Allowance for Credit Losses | (948) |
Fair Value | 5,759,442 |
Amount Reflected on the Consolidated Balance Sheet | 5,759,442 |
Total fixed-maturities available for sale | Securities Financing Transaction, Fair Value |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Loaned securities | 36,100 |
Trading securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 260,863 |
Allowance for Credit Losses | 0 |
Fair Value | 290,983 |
Amount Reflected on the Consolidated Balance Sheet | 290,983 |
Reinvested Cash Collateral Held Under Securities Lending Agreements | 15,600 |
Common stocks |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 166,721 |
Allowance for Credit Losses | 0 |
Fair Value | 172,539 |
Amount Reflected on the Consolidated Balance Sheet | 172,539 |
Total equity securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 166,721 |
Allowance for Credit Losses | 0 |
Fair Value | 172,539 |
Amount Reflected on the Consolidated Balance Sheet | 172,539 |
Short-term investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 618,014 |
Allowance for Credit Losses | 0 |
Fair Value | 618,004 |
Amount Reflected on the Consolidated Balance Sheet | 618,004 |
Short-term investments | Securities Financing Transaction, Fair Value |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Loaned securities | 100 |
Other invested assets |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 3,145 |
Allowance for Credit Losses | 0 |
Fair Value | 4,973 |
Amount Reflected on the Consolidated Balance Sheet | 4,973 |
Equity securities | Securities Financing Transaction, Fair Value |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Loaned securities | $ 21,300 |

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