On June 1, 2011, the Company completed the acquisitions of certain oil and natural gas properties in the Cleveland play, located in the Texas Panhandle, from Panther Energy Company, LLC and Red Willow Mid-Continent, LLC (collectively referred to as "Panther"). The results of operations of these properties have been included in the condensed consolidated financial statements since the acquisition date. The Company paid approximately $222 million in total consideration for these properties. The transaction was financed primarily with proceeds from the Company's May 2011 debt offering, as described below.

On May 2, 2011, and May 11, 2011, the Company completed two acquisitions of certain oil and natural gas properties in the Williston Basin. The results of operations of these properties have been included in the condensed consolidated financial statements since the acquisition dates. The Company paid $153 million in cash and recorded a receivable of $3 million and a payable of $1 million, resulting in total consideration for the acquisitions of approximately $151 million. The transactions were financed initially with borrowings under the Company's Credit Facility, as defined in Note 6.

On April 1, 2011, and April 5, 2011, the Company completed two acquisitions of certain oil and natural gas properties located in the Permian Basin, including properties from SandRidge Exploration and Production, LLC ("SandRidge"). The results of operations of these properties have been included in the condensed consolidated financial statements since the acquisition dates. The Company paid $238 million in cash and recorded a payable of $1 million, resulting in total consideration for the acquisitions of approximately $239 million. The transactions were financed initially with borrowings under the Company's Credit Facility.

On March 31, 2011, the Company completed the acquisition of certain oil and natural gas properties in the Williston Basin from an affiliate of Concho Resources Inc. ("Concho"). The results of operations of these properties have been included in the condensed consolidated financial statements since the acquisition date. The Company paid $196 million in cash and recorded a receivable from Concho of $2 million, resulting in total consideration for the acquisition of approximately $194 million. The transaction was financed primarily with proceeds from the Company's March 2011 public offering of units, as described below.

During the six months ended June 30, 2011, the Company completed other smaller acquisitions of oil and natural gas properties located in its various operating regions. The results of operations of these properties have been included in the condensed consolidated financial statements since the acquisition dates. The Company, in the aggregate, paid approximately $41 million in total consideration for these properties.

These acquisitions were accounted for under the acquisition method of accounting. Accordingly, the Company conducted assessments of net assets acquired and recognized amounts for identifiable assets acquired and liabilities assumed at their estimated acquisition date fair values, while transaction and integration costs associated with the acquisitions were expensed as incurred. The initial accounting for the business combinations is not complete and adjustments to provisional amounts, or recognition of additional assets acquired or liabilities assumed, may occur as more detailed analyses are completed and additional information is obtained about the facts and circumstances that existed as of the acquisition dates.

Assets:
Current	$	(1,481	)
Noncurrent		54
Oil and natural gas properties		851,740
Total assets acquired	$	850,313

Liabilities:
Current	$	(3,819	)
Asset retirement obligations		6,966
Total liabilities assumed	$	3,147

Net assets acquired	$	847,166

Current assets include receivables, prepaids and inventory of oil produced but not yet sold and noncurrent assets include other property and equipment. Current liabilities include payables, ad valorem taxes payable and environmental liabilities.

The fair values of oil and natural gas properties and asset retirement obligations were measured using valuation techniques that convert future cash flows to a single discounted amount. Significant inputs to the valuation of oil and natural gas properties include estimates of: (i) reserves; (ii) future operating and development costs; (iii) future commodity prices; (iv) estimated future cash flows; and (v) a market-based weighted average cost of capital rate.

The revenues and expenses related to the properties acquired from Panther, SandRidge and Concho are included in the condensed consolidated results of operations of the Company as of June 1, 2011, April 1, 2011, and March 31, 2011, respectively. The following unaudited pro forma financial information presents a summary of the Company's condensed consolidated results of operations for the three months and six months ended June 30, 2011, and June 30, 2010, assuming the acquisitions of Panther, SandRidge and Concho had been completed as of January 1, 2010, including adjustments to reflect the values assigned to the net assets acquired. The pro forma financial information is not necessarily indicative of the results of operations if the acquisitions had been effective as of this date.

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011			2010
	(in thousands, except per unit amounts)

Total revenues and other	$	521,386	$	305,436	$	423,314		$	574,507
Total operating expenses	$	201,393	$	152,638	$	383,409		$	292,691
Net income (loss)	$	240,428	$	65,980	$	(197,756	)	$	133,563

Net income (loss) per unit:
Basic	$	1.36	$	0.42	$	(1.16	)	$	0.89
Diluted	$	1.35	$	0.42	$	(1.16	)	$	0.89

In July 2010, the Company entered into a definitive purchase and sale agreement ("PSA") to acquire certain oil and natural gas properties for a contract price of $95 million. Upon the execution of the PSA, the Company paid a deposit of approximately $9 million. In September 2010, in accordance with the terms of the PSA, the Company terminated the PSA as a result of certain conditions to closing not being met. On March 28, 2011, an arbitration panel granted a favorable final ruling to the Company with regard to the termination of the PSA and the return of the deposit. On April 27, 2011, the deposit plus interest was received by the Company.

On May 27, 2010, the Company completed the acquisition of interests in Henry Savings LP and Henry Savings Management LLC (collectively referred to as "Henry") that primarily hold oil and natural gas properties located in the Permian Basin. The results of operations of these properties have been included in the condensed consolidated financial statements since the acquisition date. The Company paid $330 million in cash and recorded a receivable from Henry of $7 million, resulting in total consideration for the acquisition of approximately $323 million. The transaction was financed with borrowings under the Company's Credit Facility.

On April 30, 2010, the Company completed the acquisition of interests in two wholly owned subsidiaries of HighMount Exploration & Production LLC ("HighMount") that hold oil and natural gas properties in the Antrim Shale located in northern Michigan. The results of operations of these properties have been included in the condensed consolidated financial statements since the acquisition date. The Company paid $327 million in cash. The transaction was financed with a portion of the net proceeds from the Company's March 2010 public offering of units.

On January 29, 2010, the Company completed the acquisition of certain oil and natural gas properties located in the Anadarko Basin in Oklahoma and Kansas and the Permian Basin in Texas and New Mexico from certain affiliates of Merit Energy Company ("Merit"). The results of operations of these properties have been included in the condensed consolidated financial statements since the acquisition date. The Company paid $152 million in cash and recorded a receivable from Merit of $1 million, resulting in total consideration for the acquisition of approximately $151 million. The transaction was financed with borrowings under the Company's Credit Facility.