Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015
Operating activities
Net loss		$ (35,401)	[1]	$ (2,492)
Adjustments to reconcile net loss to net cash provided by operating activities:
(Gain) loss on disposal of oil and gas properties		(866)	[1]	629
Accretion of asset retirement obligations		160	[1]	160
Depletion, depreciation, and amortization		38,301	[1]	39,861
Stock-based compensation		313	[1]	1,746
Deferred taxes		(10,432)	[1]	(1,418)
Loss (gain) on derivative financial instruments		3,405	[1]	(18,956)
Settlements of derivative financial instruments		24,322	[1]	26,497
Gain on disposal of bonds	[1]	(29,363)
Impairment of oil and gas properties	[1]	31,082
Non-cash interest expense		1,677	[1]	825
Changes in operating assets and liabilities:
Accounts receivable		865	[1]	8,526
Prepaid expenses and other assets		(1,961)	[1]	(896)
Accounts payable and accrued expenses		(4,479)	[1]	(4,453)
Net cash provided by operating activities		17,623	[1]	50,029
Investing activities
Acquisition of oil and gas properties		(3,115)	[1]	(7,032)
Development of oil and gas properties		(24,856)	[1]	(77,735)
Proceeds from sales of oil and gas properties	[1]	2,720
Purchases of other property and equipment		(202)	[1]	(191)
Net cash used in investing activities		(25,453)	[1]	(84,958)
Financing activities
Proceeds from borrowings		64,325	[1]	123,514
Payments on borrowings		(54,789)	[1]	(93,514)
Payments on other note payable		(9)	[1]	(9)
Net cash provided by financing activities		9,527	[1]	29,991
Effect of exchange rate changes on cash and cash equivalents		(29)	[1]	(29)
Increase (decrease) in cash and cash equivalents		1,668	[1]	(4,967)
Cash and cash equivalents, beginning of the period		4,322	[1]	9,992
Cash and cash equivalents, end of the period		5,990	[1]	5,025
Supplemental information
Cash paid for interest expense		14,095	[1]	$ 11,020
Common stock issued for asset acquisition	[1]	$ 5,500

[1] Restated