Unconsolidated Affiliates Accounted For Under The Equity Method (Transactions with Equity-Method Investees) (Details) - Unconsolidated Affiliates [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Sales	$ 11,013	$ 7,308	$ 4,898
Purchases	146	316	15
Dividends and interest received	144	154	415
Commission and royalties received	108	363	$ 305
Commissions and royalties paid	$ 12	$ 11