Reportable Segments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015
Segment Reporting Information [Line Items]
Fair value adjustment on available-for-sale assets	$ 3,225			$ 3,225
Engineered Composites [Member] | Contracts Accounted for under Percentage of Completion [Member]
Segment Reporting Information [Line Items]
Charge associated with revision of contract	14,000
Write-off of deferred costs		$ 10,900
Provision for contract losses	3,100
Machine Clothing [Member]
Segment Reporting Information [Line Items]
Fair value adjustment on available-for-sale assets	$ 3,200