Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities
Net loss	$ (35,401)	$ (2,492)
Adjustments to reconcile net loss to net cash provided by operating activities:
(Gain) loss on disposal of oil and gas properties	(866)	629
Accretion of asset retirement obligations	160	160
Depletion, depreciation, and amortization	38,301	39,861
Stock-based compensation	313	1,746
Deferred taxes	(10,432)	(1,418)
(Gain) loss on derivative financial instruments	3,405	(18,956)
Settlements of derivative financial instruments	24,322	26,497
Impairment of oil and gas properties	31,082
Non-cash interest expense	1,677	825
Changes in operating assets and liabilities:
Accounts receivable	865	8,526
Prepaid expenses and other assets	(1,961)	(896)
Accounts payable and accrued expenses	(4,479)	(4,453)
Net cash provided by operating activities	46,986	50,029
Investing activities
Acquisition of oil and gas properties	(3,115)	(7,032)
Development of oil and gas properties	(24,856)	(77,735)
Proceeds from sales of oil and gas properties	2,720
Purchases of other property and equipment	(202)	(191)
Net cash used in investing activities	(25,453)	(84,958)
Financing activities
Proceeds from borrowings	64,325	123,514
Payments on borrowings	(84,152)	(93,514)
Payments on other note payable	(9)	(9)
Net cash provided by (used in) financing activities	(19,836)	29,991
Effect of exchange rate changes on cash and cash equivalents	(29)	(29)
Increase (decrease) in cash and cash equivalents	1,668	(4,967)
Cash and cash equivalents, beginning of the period	4,322	9,992
Cash and cash equivalents, end of the period	5,990	5,025
Supplemental information
Cash paid for interest expense	14,095	$ 11,020
Common stock issued for asset acquisition	$ 5,500