CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in net prior service credit and actuarial losses, tax benefit (provision)	$ 16,045	$ 654	$ (8,435)
Change in fair value of derivatives, tax benefit (provision)	65	(882)	664
Foreign currency translation, tax benefit (provision)	(6,469)	(6,248)	(1,272)
Stock option exercises, tax benefit	2,576	2,952	3,413
Net issuance of treasury stock for vested restricted stock units, tax benefit	$ 1,856	$ 408	$ 282
Treasury shares netted from common stock shares issued for two-for-one stock split		5,171

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Tax effect of the adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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