Reclassifications from Accumulated Other Comprehensive Income - Amounts Reclassified from AOCI (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net		$ 953	$ 242	$ 1,555	$ 4,136
Net sales		(776,647)	(825,847)	(1,501,978)	(1,587,837)
Cost of sales		(638,240)	(716,307)	(1,260,851)	(1,401,559)
Prior service cost and recognized actuarial loss amortization related to pensions		(315)	(296)	(599)	(596)
Foreign Currency Gain (Loss) [Member] | Reclassifications from Accumulated Other Comprehensive Income
Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net		(43)	0	559	252
Accumulated net gain (loss) from designated or qualifying cash flow hedges | Currency hedge portfolio | Reclassifications from Accumulated Other Comprehensive Income
Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Net sales		(13,829)	1,020	(30,807)	2,047
Accumulated net gain (loss) from designated or qualifying cash flow hedges | Bunker fuel forward contracts | Reclassifications from Accumulated Other Comprehensive Income
Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Cost of sales		3,465	(61)	12,240	(236)
Prior service cost and recognized actuarial loss amortization related to pensions
Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Deferred Tax Liabilities, Other Comprehensive Income			0		0	$ 1	$ 0	$ 0	$ 1
Prior service cost and recognized actuarial loss amortization related to pensions | Reclassifications from Accumulated Other Comprehensive Income
Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Prior service cost and recognized actuarial loss amortization related to pensions	[1]	$ 315	$ 296	$ 599	$ 596

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 9 for further details.