Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income (loss)	$ 12,436	$ (10,143)	$ 14,425	$ (9,502)
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	6,412	4,630	9,083	6,837
Change in fair value of derivative instruments, net of tax	(509)	2,009	536	1,477
Foreign currency translation adjustments	2,335	(6,116)	(590)	(2,679)
Other comprehensive income (loss), net of tax	8,238	523	9,029	5,635
Comprehensive income (loss)	$ 20,674	$ (9,620)	$ 23,454	$ (3,867)