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Revenue From Contracts With Customers (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Concentration Risk [Line Items] |  |  |  |  |
Revenue recognized that was included in the contract liability balance at the beginning of the period | $ 10,179 | $ 4,534 | $ 41,622 | $ 40,786 |
One Customer | Customer Concentration Risk | Accounts Receivable |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 35.00% |  | 24.00%

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