XML 45 R45.htm IDEA: XBRL DOCUMENT v2.4.0.6
Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy) (Details) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Other Investments [Member]
Dec. 31, 2011
Other Investments [Member]
Jun. 30, 2012
Alternative Investments [Member]
Jun. 30, 2011
Alternative Investments [Member]
Jun. 30, 2012
Alternative Investments [Member]
Jun. 30, 2011
Alternative Investments [Member]
Sep. 30, 2012
Alternative Investments [Member]
Dec. 31, 2011
Alternative Investments [Member]
Sep. 30, 2012
Secondary Private Equity Member
Alternative Investments [Member]
Dec. 31, 2011
Secondary Private Equity Member
Alternative Investments [Member]
Sep. 30, 2012
Private Equity [Member]
Alternative Investments [Member]
Dec. 31, 2011
Private Equity [Member]
Alternative Investments [Member]
Sep. 30, 2012
Energy Power Generation [Member]
Alternative Investments [Member]
Dec. 31, 2011
Energy Power Generation [Member]
Alternative Investments [Member]
Sep. 30, 2012
Distressed Debt [Member]
Alternative Investments [Member]
Dec. 31, 2011
Distressed Debt [Member]
Alternative Investments [Member]
Sep. 30, 2012
Real Estate Strategy [Member]
Alternative Investments [Member]
Dec. 31, 2011
Real Estate Strategy [Member]
Alternative Investments [Member]
Sep. 30, 2012
Mezzanine Financing [Member]
Alternative Investments [Member]
Dec. 31, 2011
Mezzanine Financing [Member]
Alternative Investments [Member]
Sep. 30, 2012
Venture Capital [Member]
Alternative Investments [Member]
Dec. 31, 2011
Venture Capital [Member]
Alternative Investments [Member]
Sep. 30, 2012
Other Securities [Member]
Dec. 31, 2011
Other Securities [Member]
Sep. 30, 2012
Previously Existing Partnership Commitments [Member]
Sep. 30, 2012
New Mezzanine Limited Partnerships [Member]
Increase Decrease In Net Investment Income Before Tax $ (5,100,000) $ (21,300,000)                                                          
Carrying Value 122,081,000   122,081,000   128,301,000 122,081,000 128,301,000         117,784,000 124,548,000 28,883,000 30,114,000 24,743,000 21,736,000 19,198,000 25,913,000 13,413,000 16,953,000 12,719,000 13,767,000 11,177,000 8,817,000 7,651,000 7,248,000 4,297,000 3,753,000    
Remaining Commitment           64,846,000           63,787,000   8,153,000   3,883,000   10,347,000   7,357,000   10,473,000   23,174,000   400,000   1,059,000     7,900,000
Decrease in other investments     (6,200,000)                                                        
Distributions from alternative investments     19,700,000                                                        
Net investment income earned 30,650,000 35,786,000 97,284,000 118,604,000   5,200,000   500,000 4,500,000 5,500,000 24,000,000                                        
Additional contributions     $ 8,300,000                                                     $ 5,400,000 $ 2,500,000