Derivative Financial Instruments and Hedging Activities - Notional Amounts (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount (in USD)	$ 7,020	[1]
Foreign Exchange Option [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount (in USD)	30,000	[1]
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount (in USD)	172,497	[1]
Fuel [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount (in thousands of barrels)	40,000	[1]
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount (in USD)	19,000	[1]
Cash Flow Hedging [Member] | Foreign Exchange Option [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount (in USD)	$ 26,000	[1]

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