Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Statement of Cash Flows [Abstract]
Net loss	$ (89,380)	$ (13,986)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	101,828	110,163
Impairment	72,576	0
Gain on sale of property and other assets	(175)	(3,381)
Deferred tax benefit	(16,460)	(4,492)
Non-cash stock-based compensation	11,224	7,695
(Gain) loss on derivatives recognized in net loss	(1,662)	1,977
Cash received (paid) on derivatives not recognized as revenue	2,418	(7,500)
Distribution of earnings from limited liability company	3,144	0
Equity in (income) loss from limited liability company	106	(1,511)
Amortization of debt issue costs	4,567	3,940
Amortization of discount on notes	1,423	1,423
Changes in assets and liabilities:
Accounts receivable, accrued revenue and other	14,254	(18,276)
Natural gas and natural gas liquids, prepaid expenses and other	(7,057)	(7,145)
Accounts payable, accrued gas and crude oil purchases and other accrued liabilities	(3,666)	(26,029)
Net Cash Provided by (Used in) Operating Activities	93,140	42,878
Cash flows from investing activities:
Additions to property and equipment	(454,862)	(141,319)
Acquisition of business	0	(212,521)
Proceeds from sale of property	18,459	11,677
Investment in limited liability company	(22,261)	(52,250)
Distribution from limited liability company in excess of earnings	9,951	0
Net cash used in investing activities	(448,713)	(394,413)
Cash flows from financing activities:
Proceeds from borrowings	374,153	696,500
Payments on borrowings	(309,525)	(526,000)
Payments on capital lease obligations	(2,433)	(2,337)
Increase in drafts payable	1,306	4,319
Debt refinancing costs	(3,261)	(6,896)
Conversion of restricted stock, net of shares withheld for taxes	(2,087)	(794)
Distributions to non-controlling partners in the Partnership	(66,055)	(52,536)
Contributions from non-controlling partners	3,908	0
Common dividend paid	(17,647)	(17,078)
Issuance of common units by the Partnership	389,186	232,791
Conversion of restricted units, net of units withheld for taxes	(1,928)	(1,030)
Proceeds from exercise of Partnership unit options	737	348
Net cash provided by financing activities	366,354	327,287
Net increase (decrease) in cash and cash equivalents	10,781	(24,248)
Cash and cash equivalents, beginning of period	2,976	30,343
Cash and cash equivalents, end of period	13,757	6,095
Cash paid for interest	78,334	70,460
Cash paid for income taxes	$ 6,565	$ 953