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Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Carrying Value $ 114,076 $ 128,301
Other Investments [Member]
    
Carrying Value 114,076 128,301
Remaining Commitment 56,890  
Alternative Investments [Member]
    
Carrying Value 109,664 124,548
Remaining Commitment 55,908  
Secondary Private Equity [Member] | Alternative Investments [Member]
    
Carrying Value 28,032 30,114
Remaining Commitment 7,592  
Energy Power Generation [Member] | Alternative Investments [Member]
    
Carrying Value 18,640 25,913
Remaining Commitment 8,692  
Private Equity [Member] | Alternative Investments [Member]
    
Carrying Value 18,344 21,736
Remaining Commitment 4,594  
Distressed Debt [Member] | Alternative Investments [Member]
    
Carrying Value 12,728 16,953
Remaining Commitment 2,916  
Mezzanine Financing [Member] | Alternative Investments [Member]
    
Carrying Value 12,692 8,817
Remaining Commitment 21,333  
Real Estate [Member] | Alternative Investments [Member]
    
Carrying Value 11,751 13,767
Remaining Commitment 10,381  
Venture Capital Funds [Member] | Alternative Investments [Member]
    
Carrying Value 7,477 7,248
Remaining Commitment 400  
Other Securities [Member]
    
Carrying Value 4,412 3,753
Remaining Commitment 982  
Fund of Funds Component [Member] | Distressed Debt [Member]
    
Carrying Value $ 7,800