Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Loss
Balance		$ 49,389
Balance	143,509	49,389
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss
Balance	(1,957)
Current period (loss) income	(1,397)
Balance	(3,354)
Changes in Net Pension and Other Benefit Obligations
Accumulated Other Comprehensive Loss
Balance	(233,865)
Current period (loss) income	1,627
Balance	(232,238)
Total
Accumulated Other Comprehensive Loss
Balance	(235,822)
Current period (loss) income	230
Balance	(235,592)
Arlon | Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss
Current period (loss) income	200
Arlon | Changes in Net Pension and Other Benefit Obligations
Accumulated Other Comprehensive Loss
Current period (loss) income	$ 1,600