Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 66,333	$ 4,963	$ 28,459
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	33,201	(49,725)	60,953
Change in fair value of derivative instruments, net of tax	(1,235)	(1,846)	732
Foreign currency translation adjustments	(13,751)	(13,716)	6,195
Other comprehensive income (loss), net of tax	18,215	(65,287)	67,880
Comprehensive income (loss)	$ 84,548	$ (60,324)	$ 96,339