Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 6,966	$ 23,641	$ 70,086
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	(17,891)	(14,833)	9,722
Change in fair value of derivative instruments, net of tax	2,859	(1,249)	3,049
Foreign currency translation adjustments	2,364	(1,344)	(7,993)
Other comprehensive income (loss), net of tax	(12,668)	(17,426)	4,778
Comprehensive income (loss)	$ (5,702)	$ 6,215	$ 74,864