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Revenue (Narrative) (Details) - Revenue Benchmark [Member]
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Customer A [Member]      
Disaggregation of Revenue [Line Items]      
Concentration Risk, Percentage 10.00% 10.00% 11.00%
Customer B [Member]      
Disaggregation of Revenue [Line Items]      
Concentration Risk, Percentage 11.00%   10.00%