Organization and Summary of Significant Accounting Policies (Investments in Unconsolidated Joint Ventures) (Details)	12 Months Ended
	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Document Fiscal Year Focus	2018
Rogers INOAC Corporation (RIC)
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%
Rogers INOAC Corporation (RIC) | INOAC Corporation
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%
Rogers INOAC Suzhou Corporation (RIS) | INOAC Corporation
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%