Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash Flows from Operating Activities:
Net income	$ 24,090	$ 10,246
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	4,709	2,418
Debt placement fee amortization	54
Accretion of discount on asset retirement obligations	57	32
Dry holes and abandonments of unproved properties		772
Unrealized gain on derivative instruments, net	(9,741)	(1,046)
Gain on sale of assets		(1,209)
Equity-based compensation	2,690
Changes in operating assets and liabilities:
Accounts receivable	1,020	(2,162)
Other receivable	(824)
Other current assets	2,277	(48)
Accounts payable and accrued liabilities	52	(3,733)
Revenues payable		42
Advance billings and other		(120)
Net cash provided by operating activities	24,384	5,192
Cash Flows from Investing Activities:
Additions to oil and gas properties	(7,566)	(11,825)
Additions to other property and equipment		(679)
Acquisitions of oil and natural gas properties	(16,426)	(8,161)
Proceeds from sale of other property and equipment		1,219
Proceeds from sale of investment in subsidiary, net of cash sold		2,095
Proceeds from sale of property and equipment to subsidiary, net of cash sold		4,000
Net cash used in investing activities	(23,992)	(13,351)
Cash Flows from Financing Activities:
Proceeds from line of credit	16,000	15,950
Payments on line of credit	(3,000)	(7,900)
Borrowings on note payable		412
Payments on note payable		(84)
Distributions paid	(9,656)
Repurchase of common units		(1)
Net cash provided by financing activities	3,344	8,377
Net increase in cash and cash equivalents	3,736	218
Beginning cash and cash equivalents	228	222
Ending cash and cash equivalents	3,964	440
Supplemental Cash Flow Information:
Cash paid for interest	673	189
Non-Cash Investing and Financing Activities:
Accrued capital expenditures - oil and gas properties	932	310
Notes receivable from officers, directors and employees		58
Deferred gain on sale of property and equipment to subsidiary		$ 2,766