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Derivative Financial Instruments (Derivatives And Hedging-Nondesignated) (Details) (Not Designated As Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 21,912	$ 6,431
Liability Derivatives	9,824	1,548
NYMEX Commodity Contracts [Member] \| Energy Commodity Derivatives Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	21,912	6,403
Liability Derivatives	5,149	1,514
Butane Swap Agreements [Member] \| Energy Commodity Derivatives Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives		28
Liability Derivatives	$ 4,675	$ 34

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.

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- Definition

Fair value of derivative liability, 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