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Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Carrying Value $ 125,140,000   $ 128,301,000
Decrease in other investments (3,200,000)    
Net investment income earned 32,628,000 43,473,000  
Other Investments [Member]
      
Carrying Value 125,140,000   128,301,000
Remaining Commitment 54,270,000    
Distributions from alternative investments 8,100,000    
Net investment income earned 2,000,000    
Additional contributions 3,000,000    
Alternative Investments [Member]
      
Carrying Value 121,485,000   124,548,000
Remaining Commitment 53,035,000    
Net investment income earned 2,000,000 11,600,000  
Secondary Private Equity Member | Alternative Investments [Member]
      
Carrying Value 29,761,000   30,114,000
Remaining Commitment 8,590,000    
Energy/Power Generation [Member] | Alternative Investments [Member]
      
Carrying Value 24,149,000   25,913,000
Remaining Commitment 10,420,000    
Private Equity [Member] | Alternative Investments [Member]
      
Carrying Value 23,175,000   21,736,000
Remaining Commitment 4,389,000    
Distressed Debt [Member] | Alternative Investments [Member]
      
Carrying Value 15,081,000   16,953,000
Remaining Commitment 3,074,000    
Real Estate Strategy [Member] | Alternative Investments [Member]
      
Carrying Value 12,825,000   13,767,000
Remaining Commitment 10,506,000    
Mezzanine Financing [Member] | Alternative Investments [Member]
      
Carrying Value 9,167,000   8,817,000
Remaining Commitment 15,256,000    
Venture Capital [Member] | Alternative Investments [Member]
      
Carrying Value 7,327,000   7,248,000
Remaining Commitment 800,000    
Other Securities [Member]
      
Carrying Value 3,655,000   3,753,000
Remaining Commitment $ 1,235,000