Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 8,695	$ 14,394	$ 9,413	$ 17,506
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	3,038	7,709	4,027	12,421
Change in fair value of derivative instruments, net of tax	157	572	(1,701)	330
Foreign currency translation adjustments, net of tax	(2,879)	2,181	326	(8,309)
Other comprehensive income, net of tax	316	10,462	2,652	4,442
Comprehensive income	$ 9,011	$ 24,856	$ 12,065	$ 21,948