Earnings Per Share (Calculations Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic earnings per share computation:
Net income attributable to Ferro Corporation common shareholders	$ 29,668	$ 21,025	$ 53,059	$ 42,923
Weighted-average common shares outstanding	84,341	83,673	84,284	83,602
Basic earnings per share attributable to Ferro Corporation common shareholders	$ 0.35	$ 0.25	$ 0.63	$ 0.51
Diluted earnings per share computation:
Net income attributable to Ferro Corporation common shareholders	$ 29,668	$ 21,025	$ 53,059	$ 42,923
Weighted-average common shares outstanding	84,341	83,673	84,284	83,602
Assumed exercise of stock options	791	677	818	599
Assumed satisfaction of restricted stock unit conditions	281	425	271	376
Assumed satisfaction of performance stock unit conditions	176	502	172	503
Weighted-average diluted shares outstanding	85,589	85,277	85,545	85,080
Diluted earnings per share attributable to Ferro Corporation common shareholders	$ 0.35	$ 0.25	$ 0.62	$ 0.50