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Subsequent Events - RCM3 LLC (Details) - USD ($) $ in Thousands |  | 6 Months Ended
--- | --- | ---
Jul. 26, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Subsequent Event [Line Items] |  |  |
Payments to acquire membership interest |  | $ 0 | $ 223
Subsequent Event | RMC6, LLC (RCM6) | Tinuum Group, LLC |  |  |
Subsequent Event [Line Items] |  |  |
Ownership interest, percent | 49.90% |  |
Subsequent Event | RMC6, LLC (RCM6) | NexGen Refined Coal, LLC |  |  |
Subsequent Event [Line Items] |  |  |
Ownership interest, percent | 0.10% |  |
Subsequent Event | RMC6, LLC (RCM6) | 3rd Party |  |  |
Subsequent Event [Line Items] |  |  |
Ownership interest, percent | 49.90% |  |
Subsequent Event | RMC6, LLC (RCM6) |  |  |
Subsequent Event [Line Items] |  |  |
Ownership interest, percent | 0.10% |  |
Payments to acquire membership interest | $ 100 |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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