Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 91,464		$ 422,556	[1]
Accounts receivable, net	28,488	[2]	48,550	[1],[2]
Other current assets	9,086	[3]	6,998	[1],[3]
Total current assets	129,038		478,104	[1]
Note receivable - Anadarko	260,000		260,000	[1]
Plant, property and equipment
Cost	3,733,690		3,432,392	[1]
Less accumulated depreciation	745,477		714,436	[1]
Net property, plant and equipment	2,988,213		2,717,956	[1]
Goodwill	105,336		105,336	[1]
Other intangible assets	55,159		55,490	[1]
Equity investments	109,940		106,130	[1]
Other assets	27,245		27,798	[1]
Total assets	3,674,931		3,750,814	[1]
Current liabilities
Accounts and natural gas imbalance payables	37,297	[4]	25,154	[1],[4]
Accrued ad valorem taxes	17,727		11,949	[1]
Income taxes payable	630		552	[1]
Accrued liabilities	147,636	[5]	148,600	[1],[5]
Total current liabilities	203,290		186,255	[1]
Long-term debt	1,553,319		1,168,278
Deferred income taxes	1,748		47,153	[1]
Asset retirement obligations and other	71,096		68,749	[1]
Total long-term liabilities	1,626,163		1,284,180	[1]
Total liabilities	1,829,453		1,470,435	[1]
Equity and partners' capital
Common units (218,895,515 units issued and outstanding at March 31, 2013 and December 31, 2012, respectively)	682,752		912,376	[1]
Net investment by Anadarko			199,960	[1]
Total partners' capital	682,752		1,112,336	[1]
Noncontrolling interests	1,162,726		1,168,043	[1]
Total equity and partners' capital	1,845,478		2,280,379	[1]
Total liabilities, equity and partners' capital	3,674,931		3,750,814	[1]
Third Parties [Member]
Current liabilities
Long-term debt	1,553,319		1,168,278	[1]
Affiliated Entity Member
Current assets
Accounts receivable, net			17,500
Other current assets	100		400
Current liabilities
Accounts and natural gas imbalance payables	7,500		2,500
Accrued liabilities	$ 100		$ 100

[1] Financial information has been recast to include the financial position and results attributable to the Non-Operated Marcellus Interest. See Note 2.

[2] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of zero and $17.5 million as of March 31, 2013 and December 31, 2012, respectively.

[3] Other current assets includes natural gas imbalance receivables from affiliates of $0.1 million and $0.4 million as of March 31, 2013 and December 31, 2012, respectively.

[4] Accounts and natural gas imbalance payables includes amounts payable to affiliates of $7.5 million and $2.5 million as of March 31, 2013 and December 31, 2012, respectively.

[5] Accrued liabilities include amounts payable to affiliates of $0.1 million as of March 31, 2013 and December 31, 2012. See Note 5.