Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income (loss)	$ 3,988	$ (832)	$ 1,027	$ (7,402)
Other comprehensive income (loss):
Pension and other post-retirement benefit adjustments, net of tax	2,879	2,994	3,634	3,450
Change in fair value of derivative instruments, net of tax	472	(563)	1,942	(398)
Foreign currency translation adjustments, net of tax	(7,392)	5,589	(3,059)	6,997
Other comprehensive income (loss), net of tax	(4,041)	8,020	2,517	10,049
Comprehensive income (loss)	$ (53)	$ 7,188	$ 3,544	$ 2,647