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Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Carrying Value $ 132,137,000   $ 132,137,000   $ 137,865,000
Remaining Commitment 61,620,000   61,620,000    
Decrease in other investments     (5,700,000)    
Net investment income earned 39,345,000 36,545,000 82,818,000 71,251,000  
Energy/Power Generation [Member] | Alternative Investments [Member]
          
Carrying Value 29,862,000   29,862,000   35,560,000
Remaining Commitment 10,296,000   10,296,000    
Net investment income earned 1,284,000 965,000 5,839,000 3,031,000  
Secondary Private Equity Member | Alternative Investments [Member]
          
Carrying Value 27,601,000   27,601,000   26,709,000
Remaining Commitment 12,334,000   12,334,000    
Net investment income earned 3,067,000 2,665,000 4,716,000 3,684,000  
Distressed Debt [Member] | Alternative Investments [Member]
          
Carrying Value 19,868,000   19,868,000   20,432,000
Remaining Commitment 3,389,000   3,389,000    
Net investment income earned 421,000 (41,000) 1,394,000 723,000  
Private Equity [Member] | Alternative Investments [Member]
          
Carrying Value 18,786,000   18,786,000   21,601,000
Remaining Commitment 7,966,000   7,966,000    
Net investment income earned 1,181,000 99,000 3,758,000 807,000  
Real Estate Strategy [Member] | Alternative Investments [Member]
          
Carrying Value 15,642,000   15,642,000   14,192,000
Remaining Commitment 10,670,000   10,670,000    
Net investment income earned 681,000 (494,000) 1,450,000 (2,359,000)  
Mezzanine Financing [Member] | Alternative Investments [Member]
          
Carrying Value 10,126,000   10,126,000   10,230,000
Remaining Commitment 15,865,000   15,865,000    
Net investment income earned 701,000 1,692,000 1,061,000 2,629,000  
Venture Capital [Member] | Alternative Investments [Member]
          
Carrying Value 7,666,000   7,666,000   6,386,000
Remaining Commitment 1,100,000   1,100,000    
Net investment income earned 565,000 (18,000) 1,323,000 248,000  
Other Securities [Member]
          
Carrying Value 2,586,000   2,586,000   2,755,000
Remaining Commitment 0   0    
Other Investments [Member]
          
Net investment income earned 7,922,000 4,884,000 19,588,000 8,816,000  
Alternative Investments [Member]
          
Carrying Value 129,551,000   129,551,000   135,110,000
Remaining Commitment 61,620,000   61,620,000    
Distributions from alternative investments     32,800,000    
Contributions under existing commitments     $ 7,700,000