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Derivative Financial Instruments (Derivatives And Hedging-Designated) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
NYMEX Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 16,400
Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	169	31
Liability Derivatives	11,744	6,457
Designated As Hedging Instruments [Member] \| NYMEX Commodity Contracts [Member] \| Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives
Designated As Hedging Instruments [Member] \| NYMEX Commodity Contracts [Member] \| Energy Commodity Derivatives Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	169	31
Liability Derivatives
Designated As Hedging Instruments [Member] \| NYMEX Commodity Contracts [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 11,744	$ 6,457

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

- 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