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Investment Information - Limited partnership interests (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
On-Balance Sheet (Asset) Liability $ 2,232,609 $ 1,848,679
Aggregate commitments 2,100,000 1,700,000
Equity method investments    
Schedule of Equity Method Investments [Line Items]    
On-Balance Sheet (Asset) Liability [1] 2,047,889 1,660,396
Aggregate commitments 1,800,000 1,400,000
Fair value option    
Schedule of Equity Method Investments [Line Items]    
On-Balance Sheet (Asset) Liability [2] 184,720 188,283
Aggregate commitments $ 35,600 $ 41,700
[1] Aggregate unfunded commitments were $1.8 billion at December 31, 2020, compared to $1.4 billion at December 31, 2019.
[2] Aggregate unfunded commitments were $35.6 million at December 31, 2020, compared to $41.7 million at December 31, 2019.