Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Proved oil and gas properties	$ 925,865	$ 658,519
Unproved oil and gas properties	56,715	50,377
Furniture, fixtures, and other equipment	3,520	3,270
Less - Accumulated depreciation, depletion, and amortization	(284,804)	(216,769)
Property, Plant and Equipment, Net	701,296	495,397
Accounts Payable and Accrued Liabilities [Abstract]
Trade accounts payable	32,683	20,884
Accrued operating expenses	3,549	3,490
Accrued payroll costs	4,785	5,334
Asset retirement obligation - current portion	302	2,109
Accrued taxes	3,583	3,898
Accrued Professional Fees, Current	534	2,784
Other payables	3,485	5,938
Total accounts payable and accrued liabilities	48,921	$ 44,437
Concentration Risk, Percentage		10.00%
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and Cash Equivalents, at Carrying Value	2,465	$ 7,806
Restricted Cash	0	220
Total Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 2,465	$ 8,026	$ 497
Kinder Morgan Concentration Risk [Member]
Accounts Payable and Accrued Liabilities [Abstract]
Concentration Risk, Percentage	37.00%	48.00%