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Business Segments (Concentration Risk) (Details) - Percentage of Consolidated Revenue - Customer concentration risk | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Coal Mining customer | Coal Mining customer |  |
Segment Reporting Information [Line Items] |  |
Percentage of Consolidated Revenue | 39.00% | 43.00%
NAMining customer | NAMining customer |  |
Segment Reporting Information [Line Items] |  |
Percentage of Consolidated Revenue | 17.00% | 19.00%

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