Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 8,355	$ 21,309	$ 15,456
Adjustments for changes in:
Foreign exchange translation	3,193	653	(1,620)
Unrecognized employee benefit costs	(10,520)	(23,028)	2,511
Unrealized holding gains (losses) on marketable securities	149	(28)	267
Fair value of cash flow hedges	102	(707)	1,344
Reclassification adjustments for items included in net income:
Amortization of unrecognized employee benefit costs	3,962	3,664	3,085
Realized (gains) losses from sale of marketable securities	(78)	13	23
Realized losses (gains) losses from settlement of cash flow hedges	107	(383)	(840)
Other comprehensive (loss) income	(3,085)	(19,816)	4,770
Comprehensive Income	$ 5,270	$ 1,493	$ 20,226

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