Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 1,580	$ 95,213
Adjustments to reconcile net income to net cash provided by operating activities:
Impairment of proved and unproved oil and gas properties	0	4,581
Depreciation, depletion and amortization	69,243	47,568
Accretion of asset retirement obligation	214	169
Gain on sale of oil and gas properties, net	(3,222)	(1,919)
Settlement of asset retirement obligations	(374)	(79)
Total loss (gain) on derivative contracts, net	43,983	(60,947)
Operating portion of net cash received (paid) in settlement of derivative contracts	15,866	(15,090)
Stock-based compensation	8,648	7,071
Deferred income taxes	1,665	2,470
Write-off of deferred financing costs	1,242	0
Amortization of deferred financing costs	412	325
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(18,035)	(8,195)
(Increase) decrease in prepaid expenses and other current assets	66	(376)
Increase (decrease) in accounts payable and accrued expenses	(10,438)	1,132
Increase (decrease) in revenues and royalties payable	7,067	31,869
Increase (decrease) in advances	8,331	(1,413)
Net cash provided by operating activities	126,248	102,379
Cash flows from investing activities:
Acquisition of oil and gas properties	0	(32,551)
Additions to oil and gas properties	(204,268)	(149,999)
Additions to office and other equipment	(527)	(170)
Proceeds from sale of oil and gas properties	4,184	5,965
Net cash used in investing activities	(200,611)	(176,755)
Cash flows from financing activities:
Proceeds from borrowings	234,680	156,830
Repayments of borrowings	(143,508)	(103,002)
Cash paid related to the exchange and cancellation of Class A Common Stock	(1,135)	(1,524)
Cash paid for finance leases	(392)
Deferred financing costs	(1,836)	(507)
Net cash provided by financing activities	87,809	51,797
Net increase (decrease) in cash	13,446	(22,579)
Cash at beginning of period	376	22,955
Cash at end of period	13,822	376
Cash paid for:
Interest	6,405	2,290
Non-cash investing and financing activities:
Accrued capital expenditures	28,356	22,801
Lease asset additions - ASC 842	3,722	0
Asset retirement obligations	$ 105	$ 252