Fair Value Measurements (Details) (USD $) | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 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 | $96 | | ($3,781) | | ($6,067) | |
Assets (Liabilties) at Fair Value | Other current assets | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded assets | 820 | | ' | | 1,488 | |
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 | 1,259 | [1] | ' | | 2,974 | [1] |
Gross amounts offset in the balance sheets | -1,171 | [1] | ' | | -2,227 | [1] |
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 | | ' | | 569 | |
Gross amounts offset in the balance sheets | -14 | | ' | | -34 | |
Assets (Liabilties) at Fair Value | Other current assets | 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 assets | ' | | ' | | 206 | |
Gross amounts offset in the balance sheets | -84 | | ' | | ' | |
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 | | 633 | | 137 | |
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 | ' | | ' | | 137 | |
Gross amounts offset in the balance sheets | ' | | -220 | [1] | ' | |
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 | | 953 | | ' | |
Gross amounts offset in the balance sheets | ' | | -100 | | ' | |
Assets (Liabilties) at Fair Value | Accrued liabilities | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded liabilities | -1,007 | | -4,317 | | -4,549 | |
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 | 2,482 | [1] | 1,250 | [1] | 1,194 | [1] |
Gross amounts of recognized liabilities | -3,081 | [1] | -5,947 | [1] | -5,638 | [1] |
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 | 322 | | 778 | | 1,531 | |
Gross amounts of recognized liabilities | -476 | | -643 | | -1,005 | |
Assets (Liabilties) at Fair Value | Accrued liabilities | Derivatives not designated as hedging instruments | Currency hedge portfolio | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts offset in the balance sheets | ' | | ' | | 25 | [2] |
Gross amounts of recognized liabilities | ' | | ' | | -883 | [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 | | 227 | |
Gross amounts of recognized liabilities | -254 | | ' | | ' | |
Assets (Liabilties) at Fair Value | Other liabilities | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded liabilities | -10 | | -97 | | -3,143 | |
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 | [1] | 221 | [1] |
Gross amounts of recognized liabilities | ' | | -930 | [1] | -100 | [1] |
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 | ' | | ' | | 43 | |
Gross amounts of recognized liabilities | -10 | | ' | | -3,307 | |
Level 2 | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Assets (liabilities) at fair value | 96 | | -3,781 | | -6,067 | |
Level 2 | Other current assets | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded assets | 820 | | ' | | 1,488 | |
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 | 1,259 | [1] | ' | | 2,974 | [1] |
Gross amounts offset in the balance sheets | -1,171 | [1] | ' | | -2,227 | [1] |
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 | | ' | | 569 | |
Gross amounts offset in the balance sheets | -14 | | ' | | -34 | |
Level 2 | Other current assets | 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 assets | ' | | ' | | 206 | |
Gross amounts offset in the balance sheets | -84 | | ' | | ' | |
Level 2 | Investments & other assets, net | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded assets | 293 | | 633 | | 137 | |
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 | ' | | ' | | 137 | |
Gross amounts offset in the balance sheets | ' | | -220 | [1] | ' | |
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 | | 953 | | ' | |
Gross amounts offset in the balance sheets | ' | | -100 | | ' | |
Level 2 | Accrued liabilities | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded liabilities | -1,007 | | -4,317 | | -4,549 | |
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 | 2,482 | [1] | 1,250 | [1] | 1,194 | [1] |
Gross amounts of recognized liabilities | -3,081 | [1] | -5,947 | [1] | -5,638 | [1] |
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 | 322 | | 778 | | 1,531 | |
Gross amounts of recognized liabilities | -476 | | -643 | | -1,005 | |
Level 2 | Accrued liabilities | Derivatives not designated as hedging instruments | Currency hedge portfolio | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Gross amounts offset in the balance sheets | ' | | ' | | 25 | [2] |
Gross amounts of recognized liabilities | ' | | ' | | -883 | [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 | | 227 | |
Gross amounts of recognized liabilities | -254 | | ' | | ' | |
Level 2 | Other liabilities | ' | | ' | | ' | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | | ' | | ' | |
Net amount of recorded liabilities | -10 | | -97 | | -3,143 | |
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 | [1] | 221 | [1] |
Gross amounts of recognized liabilities | ' | | -930 | [1] | -100 | [1] |
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 | ' | | ' | | 43 | |
Gross amounts of recognized liabilities | ($10) | | ' | | ($3,307) | |
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[1] | Currency hedge portfolio positions designated as cash flow hedges. |
[2] | Currency hedge portfolio positions not designated as hedging instruments. |