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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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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

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