CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 9,927	$ 17,855	$ 11,986
Other comprehensive income (loss):
Foreign currency translation adjustment	1,745	3,803	(1,436)
Retirement plans related adjustment	23,689	(8,326)	(21,750)
Unrealized gain (loss) on cash flow hedges	77	651	(533)
Other comprehensive income (loss) before tax	25,511	(3,872)	(23,719)
Income tax expense (benefit)	1,615	(496)	(607)
Other comprehensive income (loss), net of tax	23,896	(3,376)	(23,112)
Total comprehensive income (loss)	$ 33,823	$ 14,479	$ (11,126)