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Fixed Assets (Schedule Of Fixed Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Abstract]    
Fixed assets, at cost $ 959,897 $ 945,255
Less accumulated depreciation and amortization 478,993 463,070
Fixed assets, net $ 480,904 $ 482,185