Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net loss	$ (24,142)	$ (9,078)
Adjustments to reconcile net loss to net cash provided by operating activities:
(Gain) loss on disposal of oil and gas properties	(919)	625
Accretion of asset retirement obligations	107	106
Depletion, depreciation, and amortization	27,636	26,039
Stock-based compensation	191	866
Deferred taxes	(12,129)	(5,357)
Loss on derivative financial instruments	5,069	525
Settlements of derivative financial instruments	18,300	18,376
Impairment of oil and gas properties	1,938
Non-cash interest expense	550	550
Changes in operating assets and liabilities:
Accounts receivable	(818)	1,415
Prepaid expenses and other assets	229	(213)
Accounts payable and accrued expenses	(8,479)	(8,226)
Net cash provided by operating activities	7,533	25,628
Investing activities
Acquisition of oil and gas properties	(2,717)	(3,470)
Development of oil and gas properties	(19,003)	(54,585)
Proceeds from sales of oil and gas properties	2,720
Purchases of other property and equipment	(177)	(135)
Net cash used in investing activities	(19,177)	(58,190)
Financing activities
Proceeds from bank borrowings	23,500	32,000
Payments on bank borrowings	(11,000)	(5,000)
Payments on other note payable	(15)	(15)
Net cash provided by financing activities	12,485	26,985
Effect of exchange rate changes on cash and cash equivalents	(16)	1
Increase (decrease) in cash and cash equivalents	825	(5,576)
Cash and cash equivalents, beginning of the period	4,322	9,992
Cash and cash equivalents, end of the period	5,147	4,416
Supplemental information
Cash paid for interest expense	$ 11,082	$ 10,672