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Fair Value Measurements (Balance Sheet Location) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative asset, fair value, net,	$ 553	$ 1,359
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Other Current Assets [Member]
Derivative asset, fair value, gross asset	416	755
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Other Current Assets [Member]
Derivative asset, fair value, gross asset	137	155
Fuel Hedge Contracts [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivative asset, fair value, gross asset		449
Fuel Hedge Contracts [Member] \| Designated as Hedging Instrument [Member] \| Accrued Liabilities [Member]
Derivative asset, fair value, gross liability	$ 1,695

Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details