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Description Of Business And Segment Reporting (Summary Of Capital Expenditures) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total capital expenditures $ 56,827 $ 76,708 $ 49,166
Segment [Member]      
Segment Reporting Information [Line Items]      
Total capital expenditures 56,795 76,300 49,023
Corporate [Member]      
Segment Reporting Information [Line Items]      
Total capital expenditures $ 32 $ 408 $ 143