Restructuring And Optimization Programs (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Restructuring And Optimization Programs [Abstract]
Restructuring and impairment charges	$ 4,106	$ 3,018
Period expected for cash payments for employee benefits and other costs	over the next twelve months where applicable

The amount charged against earnings during an accounting period for incurred and estimated restructuring cost and for impairment loss of long lived assets, including goodwill.

No definition available.

Name:	foe_RestructuringAndImpairmentCharges
Namespace Prefix:	foe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration