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Commitments And Contingencies (Product Warranty Liability) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Product Warranties Disclosures [Abstract]      
Sales returns $ 46,318 $ 0  
Balance at the beginning of the year 44,068 42,571 $ 50,216
Reclassified to sales returns upon adoption of ASC 606 (29,147)    
Provision for warranty obligations made during the year 12,783 91,384 86,610
Settlements made during the year (13,292) (89,887) (94,255)
Balance at the end of year $ 14,412 $ 44,068 $ 42,571