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Accounts Receivable from Customers (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Accounts Receivable [Line Items] |  |
Accounts receivable from contracts with customers | $ 136,613 | $ 184,732
Accrued Income Receivable [Member] |  |
Accounts Receivable [Line Items] |  |
Accounts receivable from contracts with customers | $ 79,300 | $ 146,300
Minimum [Member] |  |
Accounts Receivable [Line Items] |  |
Revenue receipt, days after sale | 30 |
Maximum [Member] |  |
Accounts Receivable [Line Items] |  |
Revenue receipt, days after sale | 90 |

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