Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 10,073	$ 66,333	$ 4,963
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	(1,395)	33,201	(49,725)
Change in fair value of derivative instruments, net of tax	1,345	(1,235)	(1,846)
Foreign currency translation adjustments, net of tax	(4,915)	(13,751)	(13,716)
Other comprehensive income (loss), net of tax	(4,965)	18,215	(65,287)
Comprehensive income (loss)	$ 5,108	$ 84,548	$ (60,324)