DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES Notional Amounts (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Foreign currency exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 0	[1]	$ 1,950	[1]
Foreign currency option contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	0	[1]	4,000	[1]
Interest rate swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	179,066	[1]	183,851	[1]
Fuel hedge contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount (in thousands of barrels)	25,000	[1]	38,000	[1]
Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	37,064	[1]	32,300	[1]
Cash Flow Hedging [Member] | Foreign currency option contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 37,500	[1]	$ 38,000	[1]

[1] All notional amounts are stated in thousands of dollars except fuel contracts which are denominated in thousands of barrels.