Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (442)	$ 3,141	$ 5,476	$ 3,893
Foreign currency translation adjustment	(517)	(1,190)	(1,335)	(2,352)
Deferred gain (loss) on available for sale securities	134	(229)	298	(205)
Current period cash flow hedging activity, net of $169 tax expense and $819 tax benefit in the three and nine months ended September 30, 2016, respectively, and $304 and $674 tax benefit in the three and nine months ended September 30, 2015, respectively.	340	(558)	(1,541)	(1,216)
Reclassification of hedging activities into earnings, net of $149 and $254 tax benefit in the three and nine months ended September 30, 2016 and $41 and $178 tax benefit in the three and nine months ended September 30, 2015, respectively.	312	89	420	363
Reclassification of pension and postretirement adjustments into earnings, net of $88 and $271 tax benefit in the three and nine months ended September 30, 2016 and net of $97 and $300 tax benefit in the three and nine months ended September 30, 2015, respectively.	166	216	468	641
Total other comprehensive income (loss)	435	(1,672)	(1,690)	(2,769)
Comprehensive income (loss)	$ (7)	$ 1,469	$ 3,786	$ 1,124