CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash dividends declared, Common, per share	$ 0.82	$ 0.82	$ 0.82
Translation adjustments, deferred income taxes	$ (5,436)	$ 2,504	$ 7,612
Cash flow hedging instrument adjustments, deferred income taxes	567	(2,101)	347
Pension liability adjustments, deferred income taxes	7,572	19,143	(9,727)
Marketable securities unrealized gains (losses), deferred income taxes	$ (3)	$ 7	$ (7)
Stock options exercised, net, shares	38,900	157,058	91,485
Stock Issued During Period, Shares, Restricted Stock Award Net of Forfeitures and Tax Obligations Settled in Shares	68,558	92,630	69,515
Treasury shares repurchased, shares	0	286,577	0