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Schedule I Summary Of Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Securities Loaned, Asset $ 27,964  
Securities Received as Collateral 19,357 $ 0
Summary of Investments, Other than Investments in Related Parties, Cost 4,621,307  
Summary of Investments, Other than Investments in Related Parties, Fair Value 4,674,798  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 4,671,906  
US government and agency securities    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost 69,668  
Summary of Investments, Other than Investments in Related Parties, Fair Value 69,396  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 69,396  
State and municipal obligations    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost 156,587  
Summary of Investments, Other than Investments in Related Parties, Fair Value 161,722  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 161,722  
Corporate bonds and notes    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost 1,869,318  
Summary of Investments, Other than Investments in Related Parties, Fair Value 1,894,886  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 1,894,886  
RMBS    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost 189,455  
Summary of Investments, Other than Investments in Related Parties, Fair Value 187,229  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 187,229  
CMBS    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost 451,595  
Summary of Investments, Other than Investments in Related Parties, Fair Value 453,394  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 453,394  
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 672,715  
Summary of Investments, Other than Investments in Related Parties, Fair Value 674,548  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 674,548  
Foreign government and agency securities    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost 31,416  
Summary of Investments, Other than Investments in Related Parties, Fair Value 32,207  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 32,207  
Total fixed-maturities available for sale (1)    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost [1] 3,440,754  
Summary of Investments, Other than Investments in Related Parties, Fair Value [1] 3,473,382  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount [1] 3,473,382  
Trading securities (1) (2)    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost [1],[2] 588,061  
Summary of Investments, Other than Investments in Related Parties, Fair Value [1],[2] 606,434  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount [1],[2] 606,434  
Common stocks (1)    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost [1] 176,349  
Summary of Investments, Other than Investments in Related Parties, Fair Value [1] 176,065  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount [1] 176,065  
Total equity securities available for sale    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost 176,349  
Summary of Investments, Other than Investments in Related Parties, Fair Value 176,065  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 176,065  
Short-term investments (1) (3)    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost [1],[3] 415,809  
Summary of Investments, Other than Investments in Related Parties, Fair Value [1],[3] 415,691  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount [1],[3] 415,691  
Other invested assets    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Summary of Investments, Other than Investments in Related Parties, Cost 334  
Summary of Investments, Other than Investments in Related Parties, Fair Value 3,226  
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 334  
Securities Financing Transaction, Fair Value [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Securities Loaned, Asset [4] 27,964  
Securities Received as Collateral [5] $ 19,357  
[1] These classifications include a total of $28.0 million of loaned securities under securities lending agreements that are classified as other assets in our consolidated balance sheets.
[2] Includes foreign government and agency securities.
[3] Includes cash collateral held under securities lending agreements ($19.4 million) reinvested in money market instruments.
[4] Our securities loaned under securities lending agreements are included at fair value within other assets on our consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.
[5] All cash collateral received has been reinvested in accordance with the securities lending agreements and is included in short-term investments. Amounts payable on the return of cash collateral under securities lending agreements are included within other liabilities on our consolidated balance sheets.