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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 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Other Investments [Member]
Dec. 31, 2011
Other Investments [Member]
Mar. 31, 2012
Alternative Investments [Member]
Mar. 31, 2011
Alternative Investments [Member]
Mar. 31, 2012
Alternative Investments [Member]
Mar. 31, 2011
Alternative Investments [Member]
Jun. 30, 2012
Alternative Investments [Member]
Dec. 31, 2011
Alternative Investments [Member]
Jun. 30, 2012
Secondary Private Equity Member
Alternative Investments [Member]
Dec. 31, 2011
Secondary Private Equity Member
Alternative Investments [Member]
Jun. 30, 2012
Private Equity [Member]
Alternative Investments [Member]
Dec. 31, 2011
Private Equity [Member]
Alternative Investments [Member]
Jun. 30, 2012
Energy Power Generation [Member]
Alternative Investments [Member]
Dec. 31, 2011
Energy Power Generation [Member]
Alternative Investments [Member]
Jun. 30, 2012
Distressed Debt [Member]
Alternative Investments [Member]
Dec. 31, 2011
Distressed Debt [Member]
Alternative Investments [Member]
Jun. 30, 2012
Real Estate Strategy [Member]
Alternative Investments [Member]
Dec. 31, 2011
Real Estate Strategy [Member]
Alternative Investments [Member]
Jun. 30, 2012
Mezzanine Financing [Member]
Alternative Investments [Member]
Dec. 31, 2011
Mezzanine Financing [Member]
Alternative Investments [Member]
Jun. 30, 2012
Venture Capital [Member]
Alternative Investments [Member]
Dec. 31, 2011
Venture Capital [Member]
Alternative Investments [Member]
Jun. 30, 2012
Other Securities [Member]
Dec. 31, 2011
Other Securities [Member]
Jun. 30, 2012
Previously Existing Partnership Commitments [Member]
Jun. 30, 2012
New Mezzanine Limited Partnerships [Member]
Carrying Value $ 125,540,000   $ 125,540,000   $ 128,301,000 $ 125,540,000 $ 128,301,000         $ 121,578,000 $ 124,548,000 $ 29,596,000 $ 30,114,000 $ 23,739,000 $ 21,736,000 $ 21,578,000 $ 25,913,000 $ 14,702,000 $ 16,953,000 $ 12,961,000 $ 13,767,000 $ 11,146,000 $ 8,817,000 $ 7,856,000 $ 7,248,000 $ 3,962,000 $ 3,753,000    
Remaining Commitment           62,206,000           60,712,000   8,651,000   3,984,000   10,383,000   2,986,000   10,473,000   23,435,000   800,000   1,494,000     8,200,000
Decrease in other investments     (2,800,000)                                                        
Distributions from alternative investments     13,900,000                                                        
Net investment income earned 34,006,000 39,345,000 66,634,000 82,818,000   5,000,000   3,000,000 7,900,000 5,000,000 19,500,000                                        
Additional contributions     $ 6,400,000                                                     $ 4,600,000 $ 1,800,000