Consolidated Statement of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ 1,808	$ (16,961)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	61,326	53,950
(Gain) loss on sale of property	(80)	(13,779)
Impairments		1,311
Deferred tax benefit	(2,009)	(4,688)
Non-cash stock-based compensation	4,115	5,367
Derivatives mark to market interest rate settlement		(24,160)
Non-cash portion of derivatives (gain) loss	828	(581)
Non-cash portion of loss on debt extinguishment		5,396
Payment of interest paid-in-kind debt		(11,558)
Amortization of debt issue costs	4,065	3,751
Amortization of discount on notes	948	738
Equity in loss of limited liability company	236
Changes in assets and liabilities:
Accounts receivable, accrued revenue and other	(10,657)	24,142
Natural gas and natural gas liquids, prepaid expenses and other	(5,378)	1,212
Accounts payable, accrued gas purchases and other accrued liabilities	8,640	(8,112)
Net cash provided by operating activities	63,842	16,028
Cash flows from (used in) investing activities:
Additions to property and equipment	(49,643)	(18,632)
Insurance recoveries on property and equipment		874
Proceeds from sale of property	107	59,484
Investment in limited liability company	(35,000)
Net cash provided by (used in) investing activities	(84,536)	41,726
Cash flows from (used in) financing activities:
Proceeds from borrowings	277,250	893,112
Payments on borrowings	(232,308)	(1,040,405)
Payments on capital lease obligations	(1,510)	(1,114)
Increase (decrease) in drafts payable	3,165	(1,595)
Debt refinancing costs	(3,792)	(28,485)
Conversion of restricted stock, net of shares withheld for taxes	(1,019)	(84)
Distributions to non-controlling partners in the Partnership	(27,320)	(3,314)
Common dividends	(8,192)
Conversion of restricted units, net of units withheld for taxes	(1,740)	(1,725)
Proceeds from exercise of Partnership unit options	392	233
Proceeds from issuance of Partnership units		120,786
Net cash provided by (used in) financing activities	4,926	(62,591)
Net decrease in cash and cash equivalents	(15,768)	(4,837)
Cash and cash equivalents, beginning of period	22,780	10,703
Cash and cash equivalents, end of period	7,012	5,866
Cash paid for interest	35,936	29,449
Cash paid for income taxes	$ 752	$ 2,647