Joint Ventures (Accounted for Under Equity Method of Accounting) (Details)	9 Months Ended
	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31
Rogers INOAC Corporation [Member] | JAPAN [Member] | High Performance Foams [Member]
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--10-31
Rogers INOAC Suzhou Corporation [Member] | CHINA [Member] | High Performance Foams [Member]
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31