Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ 1,472,000	$ (54,967,000)	$ 13,663,000	$ (54,238,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairment expense	0	66,648,000	0	66,648,000
Depreciation, depletion and amortization	10,812,000	10,039,000	20,520,000	17,928,000
Accretion of asset retirement obligations	43,000	154,000	84,000	306,000
Settlement of asset retirement obligations			(79,000)	0
Gain on sale of oil and gas properties	(63,000)	(1,691,000)	(512,000)	(1,691,000)
Total loss (gain) on derivative contracts, net	10,850,000	(3,340,000)	16,125,000	(7,800,000)
Operating portion of net cash paid in settlement of derivative contracts			(9,267,000)	(267,000)
Stock-based compensation			4,013,000	2,958,000
Deferred income taxes			(54,000)	(9,952,000)
Write-off of deferred financing costs	0	526,000	0	526,000
Amortization of deferred financing costs	100,000	100,000	143,000	137,000
Changes in assets and liabilities:
Decrease in accounts receivable			4,475,000	3,233,000
Increase in prepaid expenses and other current assets			(992,000)	(522,000)
Decrease in accounts payable and accrued expenses			(17,286,000)	(3,148,000)
Increase (decrease) in revenues and royalties payable			8,437,000	(1,905,000)
Increase (decrease) in advances			14,159,000	(535,000)
Net cash provided by operating activities			53,429,000	11,678,000
Cash flows from investing activities:
Bold Contribution Agreement, net of cash acquired			0	(55,609,000)
Additions to oil and gas properties			(68,516,000)	(10,048,000)
Additions to office and other equipment			(53,000)	(103,000)
Proceeds from sales of oil and gas properties			210,000	2,416,000
Net cash used in investing activities			(68,359,000)	(63,344,000)
Cash flows from financing activities:
Proceeds from borrowings			25,000,000	70,000,000
Repayments of borrowings			(27,500,000)	(10,792,000)
Cash paid related to the exchange and cancellation of Class A Common Stock			(1,116,000)	0
Deferred financing costs			(213,000)	(1,071,000)
Net cash (used in) provided by financing activities			(3,829,000)	58,137,000
Net (decrease) increase in cash			(18,759,000)	6,471,000
Cash at beginning of period			22,955,000	10,200,000
Cash at end of period	$ 4,196,000	$ 16,671,000	4,196,000	16,671,000
Cash paid for:
Interest			986,000	740,000
Non-cash investing and financing activities:
Accrued capital expenditures			25,791,000	27,054,000
Asset retirement obligations			$ (141,000)	$ 21,000