Property, Plant and Equipment (Details) (Carthage Compressor Station Incident [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Carthage Compressor Station Incident [Member]
Compressor Station Fire [Abstract]
Recovery of Direct Costs	$ 1.7

Return of or reimbursements received in relation to direct costs and expenses previously paid or incurred.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Name:	us-gaap_RecoveryOfDirectCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration