Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net loss	$ (2,961)	$ (6,570)
Other comprehensive income:
Pension and other post-retirement benefit adjustments, net of tax	755	456
Change in fair value of derivative instruments, net of tax	1,470	165
Foreign currency translation adjustments, net of tax	4,333	1,408
Other comprehensive income, net of tax	6,558	2,029
Comprehensive income (loss)	$ 3,597	$ (4,541)