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Joint Ventures (Accounted for Under Equity Method of Accounting) (Details) | 6 Months Ended
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Jun. 30, 2018
Schedule of Equity Method Investments [Line Items] |
Fiscal Year-End | --12-31
Rogers INOAC Corporation (RIC) | Japan | High Performance Foams |
Schedule of Equity Method Investments [Line Items] |
Fiscal Year-End | --10-31
Rogers INOAC Suzhou Corporation (RIS) | China | High Performance Foams |
Schedule of Equity Method Investments [Line Items] |
Fiscal Year-End | --12-31

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