CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows From Operating Activities:
Net loss	$ (97,628,000)	$ (163,565,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	57,409,000	51,143,000
Impairment	28,744,000	5,000,000
Amortization of debt issue costs	2,987,000	2,855,000
Equity in loss from unconsolidated affiliates	89,733,000	158,581,000
Distributions from unconsolidated affiliates	31,229,000	17,961,000
Gain on sale of operating assets	(9,716,000)
Loss on refinancing of unsecured debt		18,233,000
Non-cash gain on risk management activities, net	(4,327,000)	(4,723,000)
Equity-based compensation	5,246,000	7,445,000
Deferred tax provision	240,000	253,000
Other non-cash items	5,196,000	(86,000)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	8,032,000	(11,132,000)
Prepayments and other current assets	1,861,000	(2,952,000)
Risk management activities	8,135,000	11,353,000
Accounts payable	(24,371,000)	17,459,000
Other current liabilities	21,010,000	14,964,000
Net cash provided by operating activities	123,780,000	122,789,000
Cash Flows From Investing Activities:
Additions to property, plant and equipment	(247,179,000)	(175,323,000)
Additions to intangible assets	(6,869,000)	(5,316,000)
Acquisitions		(16,084,000)
Investments in unconsolidated affiliates	(60,677,000)	(105,111,000)
Distributions from unconsolidated affiliates	3,279,000	2,368,000
Escrow cash		6,000
Proceeds from sale of assets	23,850,000	248,000
Other	2,604,000	98,000
Net cash used in investing activities	(284,992,000)	(299,114,000)
Cash Flows From Financing Activities:
Proceeds from long-term debt	420,375,000	725,000,000
Repayment of long-term debt	(322,000,000)	(412,665,000)
Payments of premiums and expenses on redemption of unsecured debt		(14,572,000)
Deferred financing costs	(3,539,000)	(15,743,000)
Distributions to unitholders	(126,090,000)	(114,834,000)
Proceeds from public offering of common units, net of underwriting discounts and commissions of $7,590	188,083,000
Equity offering costs	(379,000)	(4,000)
Proceeds from option exercises	1,284,000	2,747,000
Net cash provided by financing activities	157,734,000	169,929,000
Net decrease in cash and cash equivalents	(3,478,000)	(6,396,000)
Cash and cash equivalents, beginning of year	56,962,000	59,930,000
Cash and cash equivalents, end of period	$ 53,484,000	$ 53,534,000