Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 28,459	$ 6,966	$ 23,641
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	60,953	(17,891)	(14,833)
Change in fair value of derivative instruments, net of tax	732	2,859	(1,249)
Foreign currency translation adjustments	6,195	2,364	(1,344)
Other comprehensive income (loss), net of tax	67,880	(12,668)	(17,426)
Comprehensive income (loss)	$ 96,339	$ (5,702)	$ 6,215