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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
Jun. 30, 2014
Dec. 31, 2013
Carrying Value $ 106,125 $ 107,875
Other Investments [Member]
    
Carrying Value 106,125 107,875
Remaining Commitment 52,650  
Alternative Investments [Member]
    
Carrying Value 104,083 106,211
Remaining Commitment 52,053  
Secondary Private Equity Member | Alternative Investments [Member]
    
Carrying Value 23,575 25,618
Remaining Commitment 7,230  
Private Equity [Member] | Alternative Investments [Member]
    
Carrying Value 21,388 20,192
Remaining Commitment 9,917  
Energy Power Generation [Member] | Alternative Investments [Member]
    
Carrying Value 17,802 17,361
Remaining Commitment 6,984  
Mezzanine Financing [Member] | Alternative Investments [Member]
    
Carrying Value 13,243 12,738
Remaining Commitment 14,470  
Real estate [Member] | Alternative Investments [Member]
    
Carrying Value 11,039 11,698
Remaining Commitment 10,131  
Distressed debt [Member] | Alternative Investments [Member]
    
Carrying Value 9,947 11,579
Remaining Commitment 2,971  
Venture Capital [Member] | Alternative Investments [Member]
    
Carrying Value 7,089 7,025
Remaining Commitment 350  
Other Securities [Member]
    
Carrying Value 2,042 1,664
Remaining Commitment $ 597