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Intangible Assets and Goodwill (Summary Of Company's Goodwill) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets and Goodwill [Abstract]    
Goodwill, Beginning Balance $ 105,257 $ 105,257
Additions (Impairments)
Goodwill, Ending Balance $ 105,257 $ 105,257