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Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Carrying Value $ 128,301,000       $ 137,865,000       $ 128,301,000 $ 137,865,000  
Decrease in other investments                 (9,600,000)    
Net investment income earned 28,839,000 35,786,000 39,345,000 43,473,000 41,471,000 32,986,000 36,545,000 34,706,000 147,443,000 145,708,000 118,471,000
Other Investments [Member]
                      
Carrying Value 128,301,000       137,865,000       128,301,000 137,865,000  
Remaining Commitment 56,865,000               56,865,000    
Distributions from alternative investments                 45,800,000    
Net investment income earned                 20,500,000    
Additional contributions                 16,100,000    
Alternative Investments [Member]
                      
Carrying Value 124,548,000       135,110,000       124,548,000 135,110,000  
Remaining Commitment 55,344,000               55,344,000    
Net investment income earned                 21,000,000 20,000,000 (22,000,000)
Secondary Private Equity Member | Alternative Investments [Member]
                      
Carrying Value 30,114,000       26,709,000       30,114,000 26,709,000  
Remaining Commitment 9,507,000               9,507,000    
Energy/Power Generation [Member] | Alternative Investments [Member]
                      
Carrying Value 25,913,000       35,560,000       25,913,000 35,560,000  
Remaining Commitment 10,608,000               10,608,000    
Private Equity [Member] | Alternative Investments [Member]
                      
Carrying Value 21,736,000       21,601,000       21,736,000 21,601,000  
Remaining Commitment 5,368,000               5,368,000    
Distressed Debt [Member] | Alternative Investments [Member]
                      
Carrying Value 16,953,000       20,432,000       16,953,000 20,432,000  
Remaining Commitment 3,136,000               3,136,000    
Real Estate Strategy [Member] | Alternative Investments [Member]
                      
Carrying Value 13,767,000       14,192,000       13,767,000 14,192,000  
Remaining Commitment 10,569,000               10,569,000    
Mezzanine Financing [Member] | Alternative Investments [Member]
                      
Carrying Value 8,817,000       10,230,000       8,817,000 10,230,000  
Remaining Commitment 15,256,000               15,256,000    
Venture Capital [Member] | Alternative Investments [Member]
                      
Carrying Value 7,248,000       6,386,000       7,248,000 6,386,000  
Remaining Commitment 900,000               900,000    
Other Securities [Member]
                      
Carrying Value 3,753,000       2,755,000       3,753,000 2,755,000  
Remaining Commitment $ 1,521,000               $ 1,521,000