Subsequent Events Subsequent Events (Details) (Subsequent Event [Member], CHK Assets [Member], USD $) In Millions, unless otherwise specified	Apr. 30, 2013 mi acre
Subsequent Event [Line Items]
Payments to Acquire Productive Assets	$ 300
Length Of Pipeline Network	200
Net Acre Dedication Acquired	540,000
Future Capital Expenditures Related to Acquisition	$ 125
Rose Valley I plant [Member]
Subsequent Event [Line Items]
Processing Capacity	200
Rose Valley II plant [Member]
Subsequent Event [Line Items]
Processing Capacity	200

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant