Reclassifications from Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Available-for-sale investment	$ (561)		$ 0
Prior service cost and recognized actuarial loss amortization related to pensions	338	[1]	265	[1]
Currency hedge portfolio derivatives amounts reclassified to Net Sales [Member]
Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Cash flow derivatives	8,632		(4,381)
Bunker fuel forward contracts amounts reclassified to Cost of Sales [Member]
Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Cash flow derivatives	$ (2,839)		$ (5,514)

[1] * These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 8 for further details.