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Accounting Policies (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |
Allowance for losses on trade accounts receivable | $ 4,792 | $ 4,890 | $ 6,913
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ASU 2016-13 [Member] |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |
Allowance for losses on trade accounts receivable |  |  | $ 900

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