Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities
Net loss	$ (26,857)	$ (35,401)
Adjustments to reconcile net loss to net cash provided by operating activities:
Gain on disposal of oil and gas properties		(866)
Accretion of asset retirement obligations	96	160
Depletion, depreciation, and amortization	40,527	38,301
Stock-based compensation	985	313
Deferred taxes	(16,043)	(10,432)
Gain on disposal of bonds		(29,363)
(Gain) losses on derivative financial instruments	(6,505)	3,405
Settlements of derivative financial instruments	4,894	24,322
Impairment of oil and gas properties	27,081	31,082
Non-cash interest expense	4,375	1,677
(Gain) loss on warrants	(3,286)	611
Changes in operating assets and liabilities:
Accounts receivable	(5,214)	865
Prepaid expenses and other assets	(3,559)	(1,961)
Accounts payable and accrued expenses	11,973	(4,479)
Net cash provided by operating activities	28,467	18,234
Investing activities
Acquisition of oil and gas properties	(109,031)	(3,115)
Development of oil and gas properties	(56,918)	(24,856)
Proceeds from sales of oil and gas properties		2,720
Purchases of other property and equipment	(11,580)	(202)
Net cash used in investing activities	(177,529)	(25,453)
Financing activities
Proceeds from borrowings and related party borrowings	102,988	63,714
Payments on borrowings and related party borrowings	(27,504)	(54,789)
Proceeds from sale of preferred stock	77,800
Cost to issue equity	(2,790)
Payments of debt issuance costs	(2,685)
Changes in other notes payable	(3)	(9)
Net cash provided by financing activities	147,806	8,916
Effect of exchange rate changes on cash and cash equivalents		(29)
(Decrease) increase in cash and cash equivalents	(1,256)	1,668
Cash and cash equivalents, beginning of the period	6,068	4,322
Cash and cash equivalents, end of the period	4,812	5,990
Net cash used by operating activities:
Cash paid for taxes	2,465
Cash paid for interest expense	11,060	14,095
Preferred Stock
Non-cash investing and financing activities:
Stock issued for asset acquisition	$ 10,795
Common Stock
Non-cash investing and financing activities:
Stock issued for asset acquisition		$ 5,500