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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

X

- Definition

Contract Receivables and Liabilities [Line Items]

+ References

No definition available.

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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

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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

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