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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES Balance Sheet Location (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative liability | $ (5,218) | [1] | $ (4,873) | [1]
Other current liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative liability | (167) | [1] | (214) | [1]
Other non-current liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative liability | (5,051) | [1] | (4,659) | [1]
Prepaid and other current assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative asset | 2,572 | [1] | 1,781 | [1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Notional Amount | 19,625 | [2] | 32,300 | [2]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member] | Prepaid and other current assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative asset | 1,726 | [3] | 915 | [1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency option contracts [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Notional Amount | 46,000 | [2] | 38,000 | [2]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency option contracts [Member] | Other current liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative liability | (100) | [1] | (214) | [1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency option contracts [Member] | Prepaid and other current assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative asset | 846 | [1] | 673 | [1]
Not Designated as Hedging Instrument [Member] | Foreign currency exchange contracts [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Notional Amount | 0 | [2] | 1,950 | [2]
Not Designated as Hedging Instrument [Member] | Foreign currency exchange contracts [Member] | Prepaid and other current assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative asset | 0 | [1] | 25 | [1]
Not Designated as Hedging Instrument [Member] | Foreign currency option contracts [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Notional Amount | 0 | [2] | 4,000 | [2]
Not Designated as Hedging Instrument [Member] | Foreign currency option contracts [Member] | Prepaid and other current assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative asset | 0 | [1] | 8 | [1]
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Notional Amount | 180,658 | [2] | 183,851 | [2]
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Other non-current liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative liability | (5,051) | [3] | (4,659) | [1]
Not Designated as Hedging Instrument [Member] | Fuel hedge contracts [Member] | Other current liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative liability | (67) | [3] | 0 | [1]
Not Designated as Hedging Instrument [Member] | Fuel hedge contracts [Member] | Prepaid and other current assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value, derivative asset | $ 0 | [1] | $ 160 | [1]
[1] | See Note 11 — Fair Value Measurements for further information on the fair value of our derivatives including their classification within the fair value hierarchy.
[2] | All notional amounts are stated in thousands of dollars except fuel contracts which are denominated in thousands of barrels.
[3] | See Note 10 — Derivative Financial Instruments and Hedging Activities for information regarding the Balance Sheet classification of the Company’s derivative financial instruments.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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