Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Assets (Liabilties) at Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets (liabilities) at fair value	$ 4,874	$ 7,745	$ 96
Assets (Liabilties) at Fair Value \| Other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded assets	6,224	10,070	820
Assets (Liabilties) at Fair Value \| Other current assets \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets		10,215
Gross amounts offset in the balance sheets		(145)
Assets (Liabilties) at Fair Value \| Other current assets \| 30-day euro forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets			(84)
Assets (Liabilties) at Fair Value \| Other current assets \| Designated as cash flow hedges \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets	6,226		1,259
Gross amounts offset in the balance sheets	(2)		(1,171)
Assets (Liabilties) at Fair Value \| Other current assets \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets			830
Gross amounts offset in the balance sheets			(14)
Assets (Liabilties) at Fair Value \| Investments & other assets, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded assets			293
Assets (Liabilties) at Fair Value \| Investments & other assets, net \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets			293
Assets (Liabilties) at Fair Value \| Accrued liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded liabilities	1,350	2,325	(1,007)
Assets (Liabilties) at Fair Value \| Accrued liabilities \| Designated as cash flow hedges \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets	(1,460)	(14,103)	2,482
Gross amounts of recognized liabilities		438	(3,081)
Assets (Liabilties) at Fair Value \| Accrued liabilities \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets		15,990	322
Gross amounts of recognized liabilities	(2,810)		(476)
Assets (Liabilties) at Fair Value \| Accrued liabilities \| Derivatives not designated as hedging instruments \| 30-day euro forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized liabilities			(254)
Assets (Liabilties) at Fair Value \| Other Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded liabilities			(10)
Assets (Liabilties) at Fair Value \| Other Liabilities [Member] \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized liabilities			(10)
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets (liabilities) at fair value	4,874	7,745	96
Level 2 \| Other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded assets	6,224	10,070	820
Level 2 \| Other current assets \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets		10,215
Gross amounts offset in the balance sheets		(145)
Level 2 \| Other current assets \| 30-day euro forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets			(84)
Level 2 \| Other current assets \| Designated as cash flow hedges \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets	6,226		1,259
Gross amounts offset in the balance sheets	(2)		(1,171)
Level 2 \| Other current assets \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets			830
Gross amounts offset in the balance sheets			(14)
Level 2 \| Investments & other assets, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded assets			293
Level 2 \| Investments & other assets, net \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets			293
Level 2 \| Accrued liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded liabilities	(1,350)	(2,325)	(1,007)
Level 2 \| Accrued liabilities \| Designated as cash flow hedges \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets	(1,460)	(14,103)	2,482
Gross amounts of recognized liabilities		438	(3,081)
Level 2 \| Accrued liabilities \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets		$ 15,990	322
Gross amounts of recognized liabilities	$ (2,810)		(476)
Level 2 \| Accrued liabilities \| Derivatives not designated as hedging instruments \| 30-day euro forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized liabilities			(254)
Level 2 \| Other Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded liabilities			(10)
Level 2 \| Other Liabilities [Member] \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized liabilities			$ (10)