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Disclosures About Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivative Asset, Fair Value
Derivative Asset, Fair Value	$ 3,108	$ 27
Derivative Liability, Fair Value
Derivative Liability, Fair Value	(28,290)	(16,538)
Designated as Hedging Instrument [Member] \| Propane contracts [Member] \| Derivative Financial Instruments and Other Assets [Member]
Derivative Asset, Fair Value
Derivative Asset, Fair Value	3,108	27
Designated as Hedging Instrument [Member] \| Propane contracts [Member] \| Derivative Financial Instruments and Other Non Current Liabilities [Member]
Derivative Liability, Fair Value
Derivative Liability, Fair Value	(28,290)	(16,538)
Not Designated as Hedging Instrument [Member] \| Propane contracts [Member] \| Derivative Financial Instruments and Other Assets [Member]
Derivative Asset, Fair Value
Derivative Asset, Fair Value	0	0
Not Designated as Hedging Instrument [Member] \| Propane contracts [Member] \| Derivative Financial Instruments and Other Non Current Liabilities [Member]
Derivative Liability, Fair Value
Derivative Liability, Fair Value	$ 0	$ 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.

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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