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Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Net investment income earned $ 63,889 $ 93,032 $ 206,713 $ 246,479  
Other Investments 432,624   432,624   $ 409,032
Alternative Investments [Member]          
Net investment income earned (5,600) $ 42,800 22,800 $ 92,900  
Other Securities [Member]          
Other Investments 64,803   64,803   49,300
Remaining Commitment 0   0   0
Maximum Exposure to Loss [1] 64,803   64,803   49,300
Alternative Investments [Member]          
Other Investments 367,821   367,821   359,732
Remaining Commitment 246,745   246,745   214,987
Maximum Exposure to Loss [1] 614,566   614,566   574,719
Alternative Investments [Member] | Private Equity Funds [Member]          
Other Investments 284,538   284,538   273,070
Remaining Commitment 126,446   126,446   99,734
Maximum Exposure to Loss [1] 410,984   410,984   372,804
Alternative Investments [Member] | Private Credit Funds [Member]          
Other Investments 55,398   55,398   63,138
Remaining Commitment 91,196   91,196   92,674
Maximum Exposure to Loss [1] 146,594   146,594   155,812
Alternative Investments [Member] | Real Assets [Member]          
Other Investments 27,885   27,885   23,524
Remaining Commitment 29,103   29,103   22,579
Maximum Exposure to Loss [1] 56,988   56,988   46,103
Other Investments [Member]          
Other Investments 432,624   432,624   409,032
Remaining Commitment 246,745   246,745   214,987
Maximum Exposure to Loss [1] $ 679,369   $ 679,369   $ 624,019
[1] In addition to the amounts in this table, previously recognized tax credits are subject to the risk of recapture. We do not consider the risk of recapture to be significant and therefore do not reflect this risk in the Maximum Exposure to Loss column in this table.