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Related Party Transactions (Related Party Balances On Condensed Consolidated Balance Sheets) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Accounts receivable from related parties	$ 76,897	$ 53,866
Accounts payable from related parties	26,373	27,177
Net imbalance (payable to) receivable from Enterprise	(89)	1,360
Natural Gas Operations [Member] \| Enterprise [Member]
Accounts receivable from related parties	53,016	36,736
Accounts payable from related parties	2,465	2,687
Propane Operations [Member] \| Enterprise [Member]
Accounts receivable from related parties	222	2,327
Accounts payable from related parties	19,632	22,985
Other Operations [Member]
Accounts receivable from related parties	23,659	14,803
Accounts payable from related parties	$ 4,276	$ 1,505

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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