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Investment Information - Limited partnership interests (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss $ 2,721,384 $ 2,232,609
Aggregate unfunded commitments 2,400,000 2,100,000
Equity method investments    
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss [1] 2,539,124 2,047,889
Aggregate unfunded commitments 2,000,000 1,800,000
Fair value option    
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss [2] 182,260 184,720
Aggregate unfunded commitments $ 26,300 $ 35,600
[1] Aggregate unfunded commitments were $2.0 billion at June 30, 2021, compared to $1.8 billion at December 31, 2020.
[2] Aggregate unfunded commitments were $26.3 million at June 30, 2021, compared to $35.6 million at December 31, 2020.