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Revenue Recognition (Schedule Of Contract Assets And Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Opening [Member]    
Contract Receivables and Liabilities [Line Items]    
Receivables $ 1,103 $ 326
Contract Liabilities 2,200 663
Closing [Member]    
Contract Receivables and Liabilities [Line Items]    
Receivables 472 19
Contract Liabilities 2,227 722
Increase/(Decrease) [Member]    
Contract Receivables and Liabilities [Line Items]    
Receivables (631) (307)
Contract Liabilities $ 27 $ 59