Organization and Summary of Significant Accounting Policies (Investments in Unconsolidated Joint Ventures) (Details)	Dec. 31, 2017
Rogers INOAC Corporation
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%
Rogers INOAC Corporation | INOAC Corporation
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%
Rogers I N O A C Suzhou Corporation
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%
Rogers I N O A C Suzhou Corporation | INOAC Corporation
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%