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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 34,119	$ 20,099	$ 50,681	$ 52,409
Foreign currency translation adjustments	14,263	9,048	6,033	4,473
Net change in:
Deferred gains (losses) on cash flow hedges, net of taxes of $62, $196, $28 and $333, respectively	(154)	(495)	(108)	(836)
Unrecognized retirement obligations, net of taxes of $2,293, $1,787, $6,869 and $5,438, respectively	3,794	3,013	11,394	8,961
Net current period other comprehensive income (loss)	17,903	11,566	17,319	12,598
Comprehensive income	$ 52,022	$ 31,665	$ 68,000	$ 65,007

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Other comprehensive income (loss), amortization, pension and other postretirement benefit plans, net prior service cost unrecognized in net periodic pension cost, net of tax.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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