Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net loss	$ (267,328)	$ (15,960)
Adjustments to reconcile net income to net cash provided by operating activities:
Depletion, depreciation, amortization and accretion	77,265	72,234
Amortization of debt discount and issuance costs	2,680	2,111
Impairment of long-lived assets	209,402	3,798
(Gain) loss on derivatives	(8,078)	45,893
Equity in income of equity method investees	(103)	(183)
Distribution from equity method investee	191	1,129
Unit-based compensation	3,174	1,580
(Gain) loss on disposal of assets	1,007	(1,552)
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, oil and natural gas	8,155	(18,893)
(Increase) decrease in accounts receivable, joint interest owners	3,811	(8,922)
Increase in accounts receivable, other	(17)	(95)
Increase in other assets	(241)	(1,676)
Increase (decrease) in accrued oil and natural gas liabilities	(1,368)	7,078
Increase (decrease) in accrued oil and natural gas liabilities	(23,948)	20,435
Decrease in other liabilities	(4,396)	(3,208)
Total adjustments	267,534	119,729
Net cash provided by operating activities	206	103,769
Cash flows from investing activities:
Investment in oil and natural gas properties	(23,704)	(503,220)
Increase in deposits on pending acquisitions	0	(5,800)
Proceeds from sale of assets	740	3,281
Investment in other equipment	(181)	(571)
Net cash settlements on commodity derivatives	77,526	(9,620)
Net cash provided by (used in) investing activities	54,381	(515,930)
Cash flows from financing activities:
Proceeds from long-term debt	155,000	1,011,000
Payments of long-term debt	(129,000)	(737,000)
Payments of debt issuance costs	(1,475)	(9,331)
Proceeds from the issuance of units, net	(71)	224,244
Distributions to unitholders	(76,105)	(69,197)
Net cash provided by (used in) financing activities	(51,651)	419,716
Net increase in cash and cash equivalents	2,936	7,555
Cash and cash equivalents, beginning of period	725	2,584
Cash and cash equivalents, end of period	3,661	10,139
Non-cash investing and financing activities:
Asset retirement obligations associated with properties sold	(4,553)	(3,641)
Asset retirement obligations associated with property acquisitions	18,756	48,230
Units acquired in exchange for equity method investee interest	1,349	0
Incentive distribution units issued in exchange for oil and natural gas properties	$ 0	$ 30,814