Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 21,534	$ 37,446
Accounts receivable, net	45,145	66,087
Inventories, net	3,915	4,059
Prepaid expenses	2,200	2,814
Derivative instruments	11,446	24,025
Total current assets	84,240	134,431
Property and equipment, net	14,265	43,096
Right of use assets from operating leases	5,853
Oil and natural gas properties, using the full cost method:
Proved	1,224,620	915,333
Unevaluated (excluded from the amortization base)	373,761	466,616
Accumulated depreciation, depletion, amortization and impairment	(558,339)	(221,431)
Total oil and natural gas properties	1,040,042	1,160,518
Derivative instruments	1,111	2,199
Other assets	393	425
Total assets	1,145,904	1,340,669
Current liabilities:
Accounts payable and accrued liabilities	81,269	73,779
Accrued payroll and benefits payable	6,970	10,976
Accrued interest payable	5,673	13,359
Revenue distribution payable	16,275	26,225
Long-term debt and financing leases, classified as current	586	12,371
Derivative instruments	70	0
Total current liabilities	110,843	136,710
Long-term debt and financing leases, less current maturities	400,518	295,100
Derivative instruments	3,022	1,542
Noncurrent operating lease obligations	1,239
Deferred compensation	175	540
Asset retirement obligations	22,384	22,090
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; 46,876,041 issued and 46,408,285 outstanding at September 30, 2019 and 46,651,616 issued and 46,390,513 outstanding at December 31, 2018	469	467
Additional paid in capital	978,525	974,616
Treasury stock, at cost, 467,756 and 261,103 shares as of September 30, 2019 and December 31, 2018	(6,107)	(4,936)
Accumulated deficit	(365,164)	(85,460)
Total stockholders’ equity	607,723	884,687
Total liabilities and stockholders’ equity	$ 1,145,904	$ 1,340,669