CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Other Comprehensive Income [Abstract]
Income (loss) from continuing operations, net of tax	$ 37,659	$ 69,134	$ 44,250
Foreign currency translation adjustment	10,171	6,710	(6,632)
Net unrealized gain (loss) (net of taxes of $1,555 in 2012 and $292 in 2011) on marketable securities.		1,168	(110)
Unrealized gain (loss) on derivative instruments held at year end (net of taxes of $110 in 2013 and $127 in 2012)	(210)	(235)	(270)
Unrealized gain (loss) reclassified into earnings	236	270	0
Actuarial net gain (loss) incurred in fiscal year	(32,749)	6,687	44,964
Amortization of gain (loss)	2,482	3,760	2,752
Amortization of prior service credit (cost)	930	8	(31)
Other comprehensive income (loss)	46,358	4,994	(49,255)
Comprehensive income (loss) from continuing operations	84,017	74,128	(5,005)
Income (loss) from discontinued operations, net of income taxes	102	(449)	(7,195)
Comprehensive income (loss)	$ 84,119	$ 73,679	$ (12,200)