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Fair Value Measurements (Summary of the Balances Company Has Elected to Account For at Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value Disclosures [Abstract]    
Other investments $ 1,993,059 $ 1,256,948
Other assets and (liabilities) 6,100 8,982
Other liabilities $ 10,827 $ 15,193