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Customer Concentrations (Narrative) (Details) T in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) customer T | Dec. 31, 2021 USD ($)
Concentration Risk [Line Items] |  |
Number of primary customers | customer | 2 |
Customer Concentration Risk |  |
Concentration Risk [Line Items] |  |
Quantity of coke sold to three primary customers (in tons) | T | 3.4 |
Customer Concentration Risk | Cliffs Steel | Accounts Receivable |  |
Concentration Risk [Line Items] |  |
Accounts receivable net | $ 33.5 | $ 30.0
Customer Concentration Risk | U.S. Steel | Accounts Receivable |  |
Concentration Risk [Line Items] |  |
Accounts receivable net | $ 7.1 | $ 7.3
Customer Concentration Risk | Cliffs Steel and U.S. Steel | Accounts Receivable |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 39.00% | 48.00%

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126942793&loc=d3e3073-115593 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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