XML 43 R36.htm IDEA: XBRL DOCUMENT

Derivative Financial Instruments (Fair Value Of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Estimated fair value of derivative financial instruments	$ 176,956	$ 173,236
Not Designated As Hedging Instruments [Member] \| Commodity Contracts [Member] \| Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative financial instruments - Assets	171,182	164,002
Not Designated As Hedging Instruments [Member] \| Commodity Contracts [Member] \| Long-Term Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative financial instruments - Assets	10,073	11,034
Not Designated As Hedging Instruments [Member] \| Commodity Contracts [Member] \| Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative financial instruments - Liabilities	(3,447)	(1,800)
Not Designated As Hedging Instruments [Member] \| Commodity Contracts [Member] \| Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative financial instruments - Liabilities	$ (852)	$ 0

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