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Schedule I Summary Of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | $ 5,558,855 |
Fair Value | [1] | 5,725,189 |
Amount Reflected on the Consolidated Balance Sheet | [1] | 5,725,189 |
Reinvested Cash Collateral Held Under Securities Lending Agreements |  | 25,561 | $ 11,699
Loaned securities |  | 66,442 | $ 27,860
US government and agency securities |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 198,613 |
Fair Value |  | 199,928 |
Amount Reflected on the Consolidated Balance Sheet |  | 199,928 |
State and municipal obligations |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 112,003 |
Fair Value |  | 119,994 |
Amount Reflected on the Consolidated Balance Sheet |  | 119,994 |
Corporate bonds and notes |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 2,136,819 |
Fair Value |  | 2,241,280 |
Amount Reflected on the Consolidated Balance Sheet |  | 2,241,280 |
RMBS |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 766,429 |
Fair Value |  | 779,354 |
Amount Reflected on the Consolidated Balance Sheet |  | 779,354 |
CMBS |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 593,647 |
Fair Value |  | 608,015 |
Amount Reflected on the Consolidated Balance Sheet |  | 608,015 |
Other ABS |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 760,785 |
Fair Value |  | 759,129 |
Amount Reflected on the Consolidated Balance Sheet |  | 759,129 |
Foreign government and agency securities |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 5,091 |
Fair Value |  | 5,224 |
Amount Reflected on the Consolidated Balance Sheet |  | 5,224 |
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 |  | 4,573,387 |
Fair Value |  | 4,712,924 |
Amount Reflected on the Consolidated Balance Sheet |  | 4,712,924 |
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 |  | 24,000 |
Trading securities |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 297,505 |
Fair Value |  | 317,150 |
Amount Reflected on the Consolidated Balance Sheet |  | 317,150 |
Reinvested Cash Collateral Held Under Securities Lending Agreements |  | 25,600 |
Common stocks |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 153,023 |
Fair Value |  | 157,685 |
Amount Reflected on the Consolidated Balance Sheet |  | 157,685 |
Total equity securities |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 153,023 |
Fair Value |  | 157,685 |
Amount Reflected on the Consolidated Balance Sheet |  | 157,685 |
Short-term investments |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost | [2] | 533,184 |
Fair Value | [2] | 533,358 |
Amount Reflected on the Consolidated Balance Sheet | [2] | 533,358 |
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 |  | 14,900 |
Other invested assets |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Amortized Cost |  | 1,756 |
Fair Value |  | 4,072 |
Amount Reflected on the Consolidated Balance Sheet |  | 4,072 |
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 |  | $ 27,500 |
[1] | Includes $24.0 million of fixed maturity securities available for sale, $27.5 million of equity securities and $14.9 million of short-term securities loaned under securities lending agreements that are classified as other assets in our consolidated balance sheets.
[2] | Includes cash collateral held under securities lending agreements of $25.6 million that is reinvested in money market instruments.

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