Condensed Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 11,050	$ 22,780
Accounts receivable:
Trade, net of allowance for bad debt of $1,343 and $163, respectively	24,287	16,351
Accrued revenue and other	155,553	193,647
Fair value of derivative assets	4,160	5,523
Natural gas and natural gas liquids, prepaid expenses and other	11,925	9,780
Total current assets	206,975	248,081
Property and equipment, net of accumulated depreciation of $387,632 and $329,741, respectively	1,218,821	1,216,166
Fair value of derivative assets	288	1,169
Intangible assets, net of accumulated amortization of $186,402 and $151,735, respectively	464,308	498,975
Investment in limited liability company	35,000	0
Other assets, net	25,377	26,712
Total assets	1,950,769	1,991,103
Current liabilities:
Accounts payable drafts payable, and other	17,094	18,027
Accrued gas purchases	126,171	160,910
Fair value of derivative liabilities	6,453	7,980
Current portion of long-term debt	0	7,058
Other current liabilities	53,191	66,887
Total current liabilities	202,909	260,862
Long-term debt	787,934	711,512
Other long-term liabilities	24,672	26,879
Deferred tax liability	86,440	89,216
Fair value of derivative liabilities	166	1,156
Commitments and contingencies
Stockholders Equity	848,648	901,478
Total liabilities and stockholders' equity	$ 1,950,769	$ 1,991,103