Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net loss	$ (29,058)	$ (57,840)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	64,120	59,937
Stock-based compensation	1,294	3,637
Stock-based payments	0	(601)
Deferred taxes	(6,983)	(7,145)
Loss on derivative financial instruments	5,177	54,852
Settlements of derivative financial instruments	(3,858)	(16,323)
Impairment of oil and gas properties	0	12,169
Gain on disposal of property and equipment	(17)
Loss on abandoned property and equipment	0	171
Loss on sale of oil and gas properties	33,530
Non-cash interest expense	1,822	4,556
Change in fair value of warrants	(594)	2,105
Changes in operating assets and liabilities:
Accounts receivable	(8,330)	(4,596)
Prepaid expenses and other assets	(1,102)	(1,835)
Accounts payable and accrued expenses	(3,128)	6,733
Net cash provided by operating activities	52,873	55,820
Cash flows from investing activities
Acquisition of oil and gas properties	(5,239)	(4,762)
Development of oil and gas properties	(119,273)	(122,691)
Proceeds from sale of oil and gas properties	11,470
Purchases of other property and equipment	(3,527)	(1,631)
Net cash used in investing activities	(116,569)	(129,084)
Cash flows from financing activities
Proceeds from borrowings	114,000	348,744
Payments on borrowings	(52,218)	(273,466)
Repurchase and retire Class B Common Stock	0	(10)
Net cash provided by financing activities	61,782	75,268
Net (decrease) increase in cash and cash equivalents	(1,914)	2,004
Cash and cash equivalents, beginning of the period	5,355	2,538
Cash and cash equivalents, end of the period	3,441	4,542
Supplemental information:
Cash paid for taxes	0	1,147
Cash paid for interest	28,125	22,324
Non-cash investing and financing activities:
Change in asset retirement obligation	(292)	222
Change in liabilities for capital expenditures	$ 9,098	$ 16,988