Statements of Combined Consolidated Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income (loss)	$ (36,521)	$ (386)	$ 8,231
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for deferred income taxes	54,903	0	0
Asset retirement obligation accretion expense	98	65	38
Depreciation, depletion, and amortization	26,273	16,104	8,145
Amortization of debt issuance costs	494	250	163
(Gain) loss on derivative instruments	(2,617)	13,009	148
Loss from equity investment	67	0	0
Equity-based compensation expense	3,482	544	0
Gain on sale of assets	(37)	(23)	(5)
Changes in operating assets and liabilities:
Accounts receivable	(5,036)	(1,547)	(1,822)
Accounts receivable-related party	6,096	(4,133)	(6,793)
Inventories	(639)	(872)	(4,897)
Prepaid expenses and other	(606)	(202)	(326)
Accounts payable and accrued liabilities	7,151	2,656	1,954
Accounts payable and accrued liabilities-related party	(1,218)	830	(409)
Revenues and royalties payable	105	2,666	499
Revenues and royalties payable-related party	(2,303)	2,037	266
Net cash provided by operating activities	49,692	30,998	5,192
Cash flows from investing activities:
Additions to oil and natural gas properties	(102,122)	(58,160)	(7,624)
Additions to oil and natural gas properties-related party	(9,675)	(22,014)	(36,950)
Acquisition of Gulfport properties	(63,590)	0	0
Proceeds from sale of oil and natural gas properties	0	0	1,250
Purchase of other property and equipment	(1,102)	(7,065)	(11,741)
Proceeds from sale of property and equipment	48	55	20
Settlement of non-hedge derivative instruments	(8,963)	(4,127)	(3,963)
Receipt on derivative margins	2,326	4,203	3,772
Deconsolidation of Bison	0	(10)	0
Proceeds from sale of membership interest in equity investment	0	6,010	0
Net cash used in investing activities	(183,078)	(81,108)	(55,236)
Cash flows from financing activities:
Proceeds from borrowings on credit facility	15,000	40,233	61,066
Repayment on credit facility	(100,000)	0	(23,950)
Proceeds from note payable- related party	30,000	0	0
Payment of note payable- related party	(30,050)	0	0
Debt issuance costs	(450)	(770)	(718)
Initial public offering costs	(2,887)	(30)	0
Proceeds from initial public offering	237,164	0	0
Contributions by members	4,008	13,517	20,914
Distributions to members	0	0	(5,579)
Net cash provided by financing activities	152,785	52,950	51,733
Net increase in cash and cash equivalents	19,399	2,840	1,689
Cash and cash equivalents at beginning of period	6,959	4,119	2,430
Cash and cash equivalents at end of period	26,358	6,959	4,119
Supplemental disclosure of cash flow information:
Interest paid, net of capitalized interest	3,017	2,265	600
Supplemental disclosure of non-cash transactions:
Asset retirement obligation incurred, including changes in estimate	386	297	223
Distribution of equity method investments	10,504	0	0
Note payable exchanged for equipment	411	0	0
Property Contributed	0	0	7,594
Common stock issued as a result of the Gulfport transaction	138,496	0	0
Asset retirement obligation acquired as a result of the Gulfport transaction	562	0	0
Post-closing adjustment payable as a result of the Gulfport transaction	$ 18,550	$ 0	$ 0