Segment Information (Schedule Of Assets Related To Balance Sheet) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets, Net	$ 5,525,739	$ 4,770,204
Gathering And Processing [Member]
Assets, Net	1,903,285	1,724,682
Joint Ventures [Member]
Assets, Net	1,924,183	1,351,256
Contract Compression [Member]
Assets, Net	1,402,686	1,411,325
Contract Treating [Member]
Assets, Net	216,597	220,584
Corporate And Others [Member]
Assets, Net	$ 78,988	$ 62,357

The net of assets and liabilities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Paragraph 19

-Article 6

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 3

-Subparagraph (SX 210.6-09.6,7)

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606914-122999

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 210

-Section S99

-Paragraph 2

-Subparagraph (SX 210.6-05.4)

-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604008-122996

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 05

-Paragraph 4

-Article 6

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