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Schedule I Summary Of Investments (Details) $ in Thousands | Dec. 31, 2015 USD ($)
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | $ 4,348,882 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 4,301,872 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 4,298,686 |
US Treasury and Government [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 13,773 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 13,752 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 13,752 |
US States and Political Subdivisions Debt Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 36,920 | [1]
Summary of Investments, Other than Investments in Related Parties, Fair Value | 37,900 | [1]
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 37,900 | [1]
All Other Corporate Bonds [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 815,024 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 802,193 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 802,193 |
RMBS |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 226,744 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 224,905 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 224,905 |
CMBS |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 415,780 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 406,910 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 406,910 |
Other ABS |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 359,452 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 355,494 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 355,494 |
Foreign government securities |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 25,663 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 24,307 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 24,307 |
Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 1,893,356 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 1,865,461 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 1,865,461 |
Trading Assets, Excluding Debt and Equity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 1,301,187 | [2]
Summary of Investments, Other than Investments in Related Parties, Fair Value | 1,279,137 | [2]
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 1,279,137 | [2]
Common Stocks, by Industry [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 75,038 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 74,930 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 74,930 |
Nonredeemable Preferred Stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 500 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 500 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 500 |
Equity Securities, Investment Summary [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 75,538 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 75,430 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 75,430 |
Short-term Investments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 1,077,087 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 1,076,944 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 1,076,944 |
Other Long-term Investments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Cost | 1,714 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 4,900 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | $ 1,714 |
[1] | Available for sale.
[2] | Includes foreign government and agency securities.

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