CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 0	$ 0
Accounts receivable, net of allowance for doubtful accounts of $2,303 at June 30, 2020 and $1,103 at December 31, 2019	48,880	71,867
Derivative instruments	84,681	9,166
Other current assets	23,041	19,399
Total current assets	156,602	100,432
Noncurrent assets:
Oil and natural gas properties	1,383,672	1,675,717
Accumulated depletion and amortization	(179,570)	(209,105)
Total oil and natural gas properties, net	1,204,102	1,466,612
Other property and equipment	111,275	135,117
Accumulated depreciation	(26,533)	(25,462)
Total other property and equipment, net	84,742	109,655
Derivative instruments	5,268	525
Other noncurrent assets	9,788	12,974
Total assets	1,460,502	1,690,198
Current liabilities:
Accounts payable and accrued expenses	94,687	151,811
Derivative instruments	0	4,817
Total current liabilities	94,687	156,628
Noncurrent liabilities:
Long-term debt	394,262	394,319
Derivative instruments	366	141
Deferred income taxes	12,208	9,057
Asset retirement obligation	137,800	124,019
Other noncurrent liabilities	31,664	33,586
Commitments and Contingencies - Note 4
Equity:
Common stock ($0.001 par value; 750,000,000 shares authorized; 84,983,120 and 84,655,222 shares issued; and 79,870,874 and 79,542,976 shares outstanding, at June 30, 2020 and December 31, 2019, respectively)	85	85
Additional paid-in-capital	908,662	901,830
Treasury stock, at cost, (5,112,246 shares at June 30, 2020 and at December 31, 2019)	(49,995)	(49,995)
(Deficit) retained earnings	(69,237)	120,528
Total equity	789,515	972,448
Total liabilities and equity	$ 1,460,502	$ 1,690,198