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Fair Value (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Fair Value Measurements [Line Items]          
Investments measured at net asset value based on an ownership interest in partners' 2.00%   2.00%   2.00%
Transfer between Level 2 and Level 3 $ 0 $ 0 $ 0 $ 0  
Fair Value Measured Using NAV [Member] | Limited Partnerships Interest [Member]          
Fair Value Measurements [Line Items]          
Investments measured at fair value using net asset value 138,500,000   138,500,000   $ 139,500,000
Level 3 [Member]          
Fair Value Measurements [Line Items]          
Investments measured at fair value using net asset value 4,300,000   4,300,000   $ 4,300,000
Liabilities held $ 0 $ 0 $ 0 $ 0