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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, 2013
Dec. 31, 2012
Carrying Value $ 107,875 $ 114,076
Alternative Investments [Member]
    
Carrying Value 106,211 109,664
Remaining Commitment 56,538  
Other Investment Portfolio [Member]
    
Carrying Value 107,875 114,076
Remaining Commitment 56,538  
Secondary Private Equity [Member] | Alternative Investments [Member]
    
Carrying Value 25,618 28,032
Remaining Commitment 7,739  
Private Equity [Member] | Alternative Investments [Member]
    
Carrying Value 20,192 18,344
Remaining Commitment 9,998  
Energy Power Generation [Member] | Alternative Investments [Member]
    
Carrying Value 17,361 18,640
Remaining Commitment 6,984  
Mezzanine Financing [Member] | Alternative Investments [Member]
    
Carrying Value 12,738 12,692
Remaining Commitment 18,249  
Real Estate [Member] | Alternative Investments [Member]
    
Carrying Value 11,698 11,751
Remaining Commitment 10,203  
Distressed Debt [Member] | Alternative Investments [Member]
    
Carrying Value 11,579 12,728
Remaining Commitment 2,965  
Venture Capital Funds [Member] | Alternative Investments [Member]
    
Carrying Value 7,025 7,477
Remaining Commitment 400  
Other Securities [Member]
    
Carrying Value 1,664 4,412
Remaining Commitment 0  
Fund of Funds Component [Member] | Distressed Debt [Member]
    
Carrying Value $ 7,900