Reclassifications from Accumulated Other Comprehensive Income - Amounts Reclassified from AOCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended								3 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Foreign Currency Gain (Loss) [Member] Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2013 Foreign Currency Gain (Loss) [Member] Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2014 Foreign Currency Gain (Loss) [Member] Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2013 Foreign Currency Gain (Loss) [Member] Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2014 Available-for-sale investment Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2013 Available-for-sale investment Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2014 Available-for-sale investment Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2013 Available-for-sale investment Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2014 Accumulated net gain (loss) from designated or qualifying cash flow hedges Currency hedge portfolio Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2013 Accumulated net gain (loss) from designated or qualifying cash flow hedges Currency hedge portfolio Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2014 Accumulated net gain (loss) from designated or qualifying cash flow hedges Currency hedge portfolio Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2013 Accumulated net gain (loss) from designated or qualifying cash flow hedges Currency hedge portfolio Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2014 Accumulated net gain (loss) from designated or qualifying cash flow hedges Bunker fuel forward contracts Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2013 Accumulated net gain (loss) from designated or qualifying cash flow hedges Bunker fuel forward contracts Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2014 Accumulated net gain (loss) from designated or qualifying cash flow hedges Bunker fuel forward contracts Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2013 Accumulated net gain (loss) from designated or qualifying cash flow hedges Bunker fuel forward contracts Reclassifications from Accumulated Other Comprehensive Income	Jun. 30, 2014 Prior service cost and recognized actuarial loss amortization related to pensions	Mar. 31, 2014 Prior service cost and recognized actuarial loss amortization related to pensions	Dec. 31, 2013 Prior service cost and recognized actuarial loss amortization related to pensions	Jun. 30, 2013 Prior service cost and recognized actuarial loss amortization related to pensions	Mar. 31, 2013 Prior service cost and recognized actuarial loss amortization related to pensions	Dec. 31, 2012 Prior service cost and recognized actuarial loss amortization related to pensions	Jun. 30, 2014 Prior service cost and recognized actuarial loss amortization related to pensions Reclassifications from Accumulated Other Comprehensive Income		Jun. 30, 2013 Prior service cost and recognized actuarial loss amortization related to pensions Reclassifications from Accumulated Other Comprehensive Income		Jun. 30, 2014 Prior service cost and recognized actuarial loss amortization related to pensions Reclassifications from Accumulated Other Comprehensive Income		Jun. 30, 2013 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]
Deferred Tax Liabilities, Other Comprehensive Income																					$ 0	$ 271	$ 530	$ 0	$ 0	$ 0
Other income (expense), net	242	(1,568)	4,136	(2,123)	0	0	252	0	0	0	0	(561)
Net sales	(825,847)	(812,171)	(1,587,837)	(1,586,423)									1,020	6,582	2,047	15,214
Cost of sales	(716,307)	(693,346)	(1,401,559)	(1,372,497)													(61)	(2,151)	(236)	(4,990)
Prior service cost and recognized actuarial loss amortization related to pensions	$ (296)	$ (338)	$ (596)	$ (676)																							$ 296	[1]	$ 338	[1]	$ 596	[1]	$ 676	[1]

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 10 for further details.