Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net (loss) income	$ (103,019)	$ 19,348
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation, depletion and amortization	88,618	83,582
Stock-based compensation	1,822	1,707
Stock-based payments	0	(601)
Deferred taxes	(11,440)	7,601
Loss (gain) on derivative financial instruments	30,861	(22,744)
Settlements of derivative financial instruments	(3,550)	(22,623)
Impairment of oil and natural gas properties	48,412	12,169
Loss on sale or abandonment of property and equipment	34,560	170
Non-cash interest expense	2,652	5,194
Unrealized gain on warrants	(691)	(416)
Changes in operating assets and liabilities
Accounts receivable	(4,481)	(5,391)
Prepaid expenses and other assets	(623)	(3,296)
Accounts payable and accrued expenses	(2,799)	13,372
Net cash provided by operating activities	80,322	88,072
Cash flows from investing activities
Acquisition of oil and gas properties	(5,642)	(45,539)
Development of oil and gas properties	(148,438)	(171,413)
Proceeds from Sale of Oil and Gas Property and Equipment	11,470	0
Purchases of other property and equipment	(3,682)	(2,518)
Net cash used in investing activities	(146,292)	(219,470)
Cash flows from financing activities
Proceeds from borrowings	139,000	423,745
Payments on borrowings	(75,248)	(289,520)
Repurchase and retirement of Class B Common Stock	0	(10)
Net cash provided by financing activities	63,752	134,215
Increase in cash and cash equivalents	(2,218)	2,817
Cash and cash equivalents, beginning of the period	5,355	2,538
Cash and cash equivalents, end of the period	3,137	5,355
Supplemental information:
Cash paid for taxes	38	1,242
Cash paid for interest	41,217	24,395
Non-cash investing and financing activities:
Asset retirement obligation	(440)	1,331
Increase (decrease) in liabilities for capital expenditures	$ 17,993	$ (4,603)