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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Net investment income earned $ 70,222 $ 83,731 $ 142,824 $ 153,447  
Other Investments 429,546   429,546   $ 409,032
Alternative Investments [Member]          
Net investment income earned 9,300 $ 29,900 28,400 $ 50,100  
Other Securities [Member]          
Other Investments 56,230   56,230   49,300
Remaining Commitment 0   0   0
Maximum Exposure to Loss [1] 56,230   56,230   49,300
Alternative Investments [Member]          
Other Investments 373,316   373,316   359,732
Remaining Commitment 246,694   246,694   214,987
Maximum Exposure to Loss [1] 620,010   620,010   574,719
Alternative Investments [Member] | Private Equity Funds [Member]          
Other Investments 289,965   289,965   273,070
Remaining Commitment 124,342   124,342   99,734
Maximum Exposure to Loss [1] 414,307   414,307   372,804
Alternative Investments [Member] | Private Credit Funds [Member]          
Other Investments 56,805   56,805   63,138
Remaining Commitment 92,436   92,436   92,674
Maximum Exposure to Loss [1] 149,241   149,241   155,812
Alternative Investments [Member] | Real Assets [Member]          
Other Investments 26,546   26,546   23,524
Remaining Commitment 29,916   29,916   22,579
Maximum Exposure to Loss [1] 56,462   56,462   46,103
Other Investments [Member]          
Other Investments 429,546   429,546   409,032
Remaining Commitment 246,694   246,694   214,987
Maximum Exposure to Loss [1] $ 676,240   $ 676,240   $ 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.