Business Combinations and Divestitures (Details) $ in Thousands			12 Months Ended
	Oct. 01, 2015 USD ($)	Feb. 27, 2015 USD ($) a shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Allocation of purchase price
Current note payable		$ (12,500)
Carrying value of net assets sold			$ 31,000
Sale leaseback transaction, transaction costs			400
Sale leaseback transaction, current period gain recognized			1,100
Deferred gain on sale of property, current			4,830	$ 0
Deferred gain on sale of property, non-current			102,506	$ 0
Harvey E Yates Company [Member]
Business Acquisition [Line Items]
Number of gross acres in acreage acquired | a		58,600
Number of net acres in acreage acquired | a		18,200
Business combination, consideration transferred, liabilities incurred		$ 33,600
Shares issued upon conversion | shares		10
Purchase price adjustments for production, revenues and operating and capital expenditures		$ 4,500
Liabilities assumed		4,500
Transaction costs			2,500
Consideration given
Cash			26,148
Total consideration given			130,116
Allocation of purchase price
Cash acquired			626
Accounts receivable			3,542
Inventory			180
Other current assets			106
Evaluated oil and natural gas properties			16,524
Unproved oil and unevaluated natural gas properties			202,310
Other property and equipment			178
Accounts payable			(2,034)
Accrued liabilities			(495)
Current note payable			(11,982)
Asset retirement obligations			(2,046)
Deferred tax liabilities incurred		$ (76,800)	(76,793)
Net assets acquired			130,116
Harvey E Yates Company [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Shares issued for acquisition | shares		3,300,000
Consideration given
Shares issued			71,478
Harvey E Yates Company [Member] | Convertible Preferred Stock [Member]
Business Acquisition [Line Items]
Shares issued for acquisition | shares		150,000
Consideration given
Shares issued			32,490
EnLink [Member]
Allocation of purchase price
Proceeds from sale of oil and gas property and equipment	$ 143,400
Proceeds from sale of oil and gas property and equipment net of purchase price adjustments	139,800
Purchase price adjustments	$ 3,600
Sale leaseback transaction, deferred gain			$ 108,400