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Fair Value Measurements (Summary of the Balances Company Has Elected to Account For at Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value Disclosures [Abstract]    
Other investments $ 2,182,479 $ 1,993,059
Other assets 4,416 6,100
Other liabilities $ 8,515 $ 10,827