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
Net income	$ 2,909	$ 16,719	$ 12,322	$ 34,225
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	1,063	2,739	5,090	15,160
Change in fair value of derivative instruments, net of tax	501	(3,212)	(1,200)	(2,882)
Foreign currency translation adjustments, net of tax	485	(1,265)	811	(9,574)
Other comprehensive income (loss), net of tax	2,049	(1,738)	4,701	2,704
Comprehensive income	$ 4,958	$ 14,981	$ 17,023	$ 36,929