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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
Sep. 30, 2013
Dec. 31, 2012
Carrying Value $ 108,073 $ 114,076
Other Investments [Member]
    
Carrying Value 108,073 114,076
Remaining Commitment 58,935  
Alternative Investments [Member]
    
Carrying Value 106,189 109,664
Remaining Commitment 57,646  
Secondary Private Equity Member | Alternative Investments [Member]
    
Carrying Value 25,954 28,032
Remaining Commitment 7,703  
Private Equity [Member] | Alternative Investments [Member]
    
Carrying Value 18,951 18,344
Remaining Commitment 10,502  
Energy Power Generation [Member] | Alternative Investments [Member]
    
Carrying Value 17,049 18,640
Remaining Commitment 7,076  
Mezzanine Financing [Member] | Alternative Investments [Member]
    
Carrying Value 12,921 12,692
Remaining Commitment 18,796  
Real Estate Strategy [Member] | Alternative Investments [Member]
    
Carrying Value 12,385 11,751
Remaining Commitment 10,205  
Distressed Debt [Member] | Alternative Investments [Member]
    
Carrying Value 11,911 12,728
Remaining Commitment 2,964  
Venture Capital [Member] | Alternative Investments [Member]
    
Carrying Value 7,018 7,477
Remaining Commitment 400  
Other Securities [Member]
    
Carrying Value 1,884 4,412
Remaining Commitment $ 1,289