Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 56,137	$ 22,595
Accounts receivable:
Accounts receivable, gross	43,197	50,744
Allowance for credit losses	(4,215)	(1,097)
Accounts receivable, net	38,982	49,647
Inventories, net	2,456	3,730
Prepaid expenses	4,034	3,471
Derivative instruments	15,197	947
Total current assets	116,806	80,390
Property and equipment, net	7,948	9,217
Right of use assets from operating leases	1,744	2,444
Oil and natural gas properties, using the full cost method:
Proved	1,569,627	1,276,036
Unevaluated (excluded from the amortization base)	142,295	371,229
Accumulated depreciation, depletion, amortization and impairment	(1,246,703)	(754,379)
Total oil and natural gas properties	465,219	892,886
Held for sale assets	111	2,860
Derivative instruments	1,990	0
Other assets	1,349	635
Total assets	595,167	988,432
Current liabilities:
Accounts payable and accrued liabilities	39,272	64,558
Accrued payroll and benefits payable	5,970	10,963
Accrued interest payable	12,309	12,227
Revenue distribution payable	9,322	22,370
Long-term debt and financing leases, classified as current	521,292	594
Derivative instruments	0	11,957
Total current liabilities	588,165	122,669
Long-term debt and financing leases, less current maturities	996	421,392
Derivative instruments	0	5,075
Noncurrent operating lease obligations	234	917
Deferred compensation	419	165
Asset retirement obligations	21,412	21,073
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, 5,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.01 par value, 192,130,071 shares authorized; 48,297,606 issued and 47,790,146 outstanding at June 30, 2020 and 48,413,185 issued and 47,942,230 outstanding at December 31, 2019	483	485
Additional paid in capital	977,957	977,174
Treasury stock, at cost, 507,460 and 470,955 shares as of June 30, 2020, and December 31, 2019	(6,128)	(6,110)
Accumulated deficit	(988,371)	(554,408)
Total stockholders’ equity	(16,059)	417,141
Total liabilities and stockholders’ equity	$ 595,167	$ 988,432