Income Taxes (Income Tax Expense (Benefit) Allocated Directly to Ferro Corporation Shareholders' Equity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Interest rate swaps	$ (2,848)	$ (3,210)	$ (1,529)
Postretirement benefit liability adjustments	153	11	(32)
Net investment hedge	(2,113)	654	954
Foreign currency translations	44	27
Total income tax (benefit) expense allocated to Ferro Corporation shareholders' equity	$ (4,764)	$ (2,518)	$ (607)