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Revenue Recognition (Schedule Of Contract Assets And Liabilities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Opening [Member] |  |  |  |
Contract Receivables and Liabilities [Line Items] |  |  |  |
Receivables | $ 472 | $ 19 | $ 1,103 | $ 326
Contract Liabilities | 2,227 | 722 | 2,200 | 663
Closing [Member] |  |  |  |
Contract Receivables and Liabilities [Line Items] |  |  |  |
Receivables | 739 | 9 | 739 | 9
Contract Liabilities | 2,769 | 2,193 | 2,769 | 2,193
Increase/(Decrease) [Member] |  |  |  |
Contract Receivables and Liabilities [Line Items] |  |  |  |
Receivables | 267 | (10) | (364) | (317)
Contract Liabilities | $ 542 | $ 1,471 | $ 569 | $ 1,530

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- Definition Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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- Definition Amount of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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