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Fixed Assets (Schedule Of Fixed Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Property, Plant and Equipment [Abstract]      
Fixed assets, at cost $ 528,962 $ 424,056 $ 396,789
Less accumulated depreciation and amortization 224,818 195,106 186,485
Fixed assets, net $ 304,144 $ 228,950 $ 210,304