Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 2,067	$ (16,775)	$ 6,537	$ 4,862
Other comprehensive income (loss)
Foreign currency translation	(8,212)	1,818	(4,622)	1,744
Unrealized gain (loss) on investments, net of tax of $(52), $15, $(31), and $7	(100)	28	(60)	13
Benefit plan amortization, net of tax of $489, $379, $1,468, and $1,139	909	704	2,727	2,116
Other comprehensive income (loss), net of tax	(7,403)	2,550	(1,955)	3,873
Comprehensive income (loss)	$ (5,336)	$ (14,225)	$ 4,582	$ 8,735