Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (150,153)	$ (23,983)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation, depletion and amortization	51,967	3,445
Exploration expense	16,897	470
Pension benefit costs	69
Incentive unit compensation	87
Impairment of oil and gas properties	4,605
Accretion of asset retirement obligations	575	234
Gain on reduction of pension liability	(2,208)	0
Gain on derivative instruments	(1,098)
Net cash payments on settled derivatives	(1,647)
Net cash payments on option premiums	(385)
Gain on business acquisition	(1,585)
Deferred income taxes	83,997
Interest not paid in cash	2,166	10,508
Amortization of deferred financing costs	1,314	647
Amortization of debt discount	1,711
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(37,187)	(4,966)
Other assets	(1,213)	(1,401)
Accounts payable and accrued liabilities	21,270	3,954
Accrued liabilities-affiliate	(1,951)
Net cash used in operating activities	(12,769)	(11,092)
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures for oil and gas properties	(507,756)	(153,390)
Capital expenditures for other property and equipment	(2,986)
Proceeds from the sale of oil and gas properties		8,497
Acquisition of business, net of cash acquired	754	(651,847)
Net cash used in investing activities	(509,988)	(796,740)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt issuance costs	(1,232)	(6,890)
Capital contributions	124,667	583,595
Proceeds from issuance of common stock, net of underwriting fees	550,025
Initial public offering costs	(5,303)
Repayments (borrowings) under revolving credit facility
Proceeds from issuance of long-term debt		288,000
Repayments of long-term debt	(166)
Net cash provided by financing activities	667,991	864,705
Net increase in cash and cash equivalents	145,234	56,873
Cash and cash equivalents at beginning of period	109,509	27,057
Cash and cash equivalents at end of period	254,743	83,930
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	25,865
Cash paid for income taxes
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES:
Asset retirement obligations incurred, including changes in estimate	420
Additions of other property through debt financing	823
Additions to oil and natural gas properties-changes in accounts payable, accrued liabilities, and accrued capital expenditures	114,639	8,256
Interest paid-in-kind	$ 22,461