DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES Balance Sheet Location (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Fair value, derivative liability	$ (5,478)	[1]	$ (4,873)	[1]
Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value, derivative liability	(333)	[1]	(214)	[1]
Other non-current liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value, derivative liability	(5,145)	[1]	(4,659)	[1]
Prepaid and other current assets [Member]
Derivatives, Fair Value [Line Items]
Fair value, derivative asset	3,949	[1]	1,781	[1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value, derivative liability	(84)	[1]	0	[1]
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	2,616	[1]	915	[1]
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	(90)	[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	1,333	[1]	673	[1]
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] | 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] | Other non-current liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value, derivative liability	(5,145)	[1]	(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	(159)	[1]	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 10 — Fair Value Measurements for further information on the fair value of our derivatives including their classification within the fair value hierarchy.