CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash flow from operating activities
Net income (loss)	$ (209,573)	$ 125,096
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation, depletion and amortization	145,711	107,132
Unit-based compensation expenses	11,181	7,400
Loss on extinguishment of debt	94,372	0
Amortization and write-off of deferred financing fees and other	12,413	15,711
Gains on sale of assets and other, net	(156)	(515)
Bad debt expenses	(5)	(19)
Deferred income tax	2,790	2,702
Mark-to-market on derivatives
Total (gains) losses	163,961	(163,387)
Cash settlements	104,512	135,594
Cash settlements on canceled derivatives	0	(74,275)
Premiums paid for derivatives	0	(91,028)
Changes in assets and liabilities
Increase in accounts receivable - trade, net	(82,202)	(22,791)
Decrease in other assets	2,333	11,859
Increase in accounts payable and accrued expenses	74,348	3,108
Increase (decrease) in other liabilities	(15,923)	18,596
Net cash provided by operating activities	303,762	75,183
Cash flow from investing activities
Acquisition of oil and natural gas properties	(847,780)	(771,189)
Development of oil and natural gas properties	(225,889)	(62,357)
Purchases of other property and equipment	(18,657)	(8,125)
Proceeds from sale of properties and equipment and other	10,590	586
Net cash used in investing activities	(1,081,736)	(841,085)
Cash flow from financing activities
Proceeds from sale of units	648,971	431,250
Proceeds from borrowings	1,359,240	2,188,176
Repayments of debt	(1,064,679)	(1,420,000)
Distributions to unitholders	(222,391)	(175,435)
Financing fees, offering expenses and other, net	(111,987)	(60,488)
Excess tax benefit from unit-based compensation	2,587	1,741
Purchase of units	0	(11,832)
Net cash provided by financing activities	611,741	953,412
Net increase (decrease) in cash and cash equivalents	(166,233)	187,510
Cash and cash equivalents
Beginning	236,001	22,231
Ending	$ 69,768	$ 209,741

The component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement to which such costs relate, as well as the write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt, and other items.

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The realized cash settlements from canceled derivative instruments, which were included in earnings in the period. Includes commodity and interest rate derivatives.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt, and other items representing cash flows from financing activities.

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The realized and unrealized increases (decreases) in the market value of derivative instruments, which were included in earnings in the period. Includes commodity and interest rate derivatives.

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Gain or loss recognized on sale of property and other; includes oil and gas property and other items.

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The net change during the reporting period in the aggregate amount of obligations and expenses incurred but not paid.

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The cash premiums paid to enter into derivative instrument agreements, including commodity and interest rate derivatives.

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.

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The net change between the beginning and ending balance of cash and cash equivalents.

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The net amount of deferred income taxes and income tax credits less the tax benefit from exercise of stock options.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Cash dividends declared or paid to a common shareholder or unit-holder by LLC or LP.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

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The net change during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The net change during the reporting period in other operating assets not otherwise defined in the taxonomy.

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The net change during the reporting period in other operating obligations not otherwise defined in the taxonomy.

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The net cash inflow (outflow) from financing activity for the period.

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The net cash inflow (outflow) from investing activity.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The cash outflow to reacquire common and preferred stock.

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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

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The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy.

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The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from the issuance of common, preferred, and treasury stocks, stock options, and such forth.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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The cash outflow for the payment of other borrowing not otherwise defined in the taxonomy.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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