Fair Value Measurements (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 |
In Thousands, unless otherwise specified |
Assets (Liabilties) at Fair Value | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Assets (liabilities) at fair value | $18,972 | | ($3,781) | | ($10,051) | |
Assets (Liabilties) at Fair Value | Other current assets | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded assets | 18,972 | | ' | | ' | |
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 | 22,593 | | ' | | ' | |
Gross amounts offset in the balance sheets | -750 | | ' | | ' | |
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 offset in the balance sheets | -3,373 | [1] | ' | | ' | |
Assets (Liabilties) at Fair Value | Other current assets | Designated as cash flow hedges | 30-day euro forward contracts | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts of recognized assets | 502 | | ' | | ' | |
Assets (Liabilties) at Fair Value | Investments & other assets, net | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded assets | ' | | 633 | | 61 | |
Assets (Liabilties) at Fair Value | Investments & other assets, net | Designated as cash flow hedges | Currency hedge portfolio | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts of recognized assets | ' | | ' | | 515 | |
Gross amounts offset in the balance sheets | ' | | -220 | | -465 | |
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 | ' | | 953 | [1] | 196 | |
Gross amounts offset in the balance sheets | ' | | -100 | [1] | -137 | |
Assets (Liabilties) at Fair Value | Investments & other assets, net | Derivatives not designated as hedging instruments | Bunker fuel forward contracts | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts of recognized assets | ' | | ' | | 22 | |
Gross amounts offset in the balance sheets | ' | | ' | | -70 | |
Assets (Liabilties) at Fair Value | Accrued liabilities | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded liabilities | ' | | -4,317 | | -9,161 | |
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 | ' | | 1,250 | | 1,163 | |
Gross amounts of recognized liabilities | ' | | -5,947 | | -10,913 | |
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 | ' | | 778 | [1] | 1,212 | [1] |
Gross amounts of recognized liabilities | ' | | -643 | [1] | -611 | [1] |
Assets (Liabilties) at Fair Value | Accrued liabilities | Derivatives not designated as hedging instruments | Bunker fuel forward contracts | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts offset in the balance sheets | ' | | ' | | 282 | [2] |
Gross amounts of recognized liabilities | ' | | ' | | -203 | [2] |
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 offset in the balance sheets | ' | | 245 | | 17 | |
Gross amounts of recognized liabilities | ' | | ' | | -108 | |
Assets (Liabilties) at Fair Value | Other liabilities | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded liabilities | ' | | -97 | | -951 | |
Assets (Liabilties) at Fair Value | Other 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 | ' | | 833 | | 196 | |
Gross amounts of recognized liabilities | ' | | -930 | | -233 | |
Assets (Liabilties) at Fair Value | Other 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 | ' | | ' | | 145 | [1] |
Gross amounts of recognized liabilities | ' | | ' | | -835 | [1] |
Assets (Liabilties) at Fair Value | Other liabilities | Derivatives not designated as hedging instruments | Bunker fuel forward contracts | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts offset in the balance sheets | ' | | ' | | 12 | [2] |
Gross amounts of recognized liabilities | ' | | ' | | -236 | [2] |
Level 2 | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Assets (liabilities) at fair value | 18,972 | | -3,781 | | -10,051 | |
Level 2 | Other current assets | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded assets | 18,972 | | ' | | ' | |
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 | 22,593 | | ' | | ' | |
Gross amounts offset in the balance sheets | -750 | | ' | | ' | |
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 offset in the balance sheets | -3,373 | [1] | ' | | ' | |
Level 2 | Other current assets | Designated as cash flow hedges | 30-day euro forward contracts | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts of recognized assets | 502 | | ' | | ' | |
Level 2 | Investments & other assets, net | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded assets | ' | | 633 | | 61 | |
Level 2 | Investments & other assets, net | Designated as cash flow hedges | Currency hedge portfolio | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts of recognized assets | ' | | ' | | 515 | |
Gross amounts offset in the balance sheets | ' | | -220 | | -465 | |
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 | ' | | 953 | [1] | 196 | |
Gross amounts offset in the balance sheets | ' | | -100 | [1] | -137 | |
Level 2 | Investments & other assets, net | Derivatives not designated as hedging instruments | Bunker fuel forward contracts | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts of recognized assets | ' | | ' | | 22 | |
Gross amounts offset in the balance sheets | ' | | ' | | -70 | |
Level 2 | Accrued liabilities | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded liabilities | ' | | -4,317 | | -9,161 | |
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 | ' | | 1,250 | | 1,163 | |
Gross amounts of recognized liabilities | ' | | -5,947 | | -10,913 | |
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 | ' | | 778 | [1] | 1,212 | [1] |
Gross amounts of recognized liabilities | ' | | -643 | [1] | -611 | [1] |
Level 2 | Accrued liabilities | Derivatives not designated as hedging instruments | Bunker fuel forward contracts | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts offset in the balance sheets | ' | | ' | | 282 | [2] |
Gross amounts of recognized liabilities | ' | | ' | | -203 | [2] |
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 offset in the balance sheets | ' | | 245 | | 17 | |
Gross amounts of recognized liabilities | ' | | ' | | -108 | |
Level 2 | Other liabilities | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded liabilities | ' | | -97 | | -951 | |
Level 2 | Other 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 | ' | | 833 | | 196 | |
Gross amounts of recognized liabilities | ' | | -930 | | -233 | |
Level 2 | Other 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 | ' | | ' | | 145 | [1] |
Gross amounts of recognized liabilities | ' | | ' | | -835 | [1] |
Level 2 | Other liabilities | Derivatives not designated as hedging instruments | Bunker fuel forward contracts | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts offset in the balance sheets | ' | | ' | | 12 | [2] |
Gross amounts of recognized liabilities | ' | | ' | | ($236) | [2] |
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[1] | Bunker fuel forward contracts designated as cash flow hedges. |
[2] | Bunker fuel forward contracts not designated as hedging instruments. |