CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 11,203	$ 16,449
Accounts receivable, net of allowance	53,595	62,120
Derivative assets	126,207	3,916
Prepayments and other current assets	2,709	3,952
Total current assets	193,714	86,437
Property and equipment - at cost, successful efforts method for oil and gas properties:
Proved oil and gas properties	2,657,302	2,644,129
Unproved oil and gas properties, excluded from amortization	315,216	357,793
Furniture, equipment and other	29,943	29,804
Property, plant and equipment, gross	3,002,461	3,031,726
Accumulated depreciation, depletion, amortization and impairment	(2,210,712)	(967,552)
Total property and equipment, net	791,749	2,064,174
Derivative assets	35,979	0
Other noncurrent assets	4,560	5,441
Total	1,026,002	2,156,052
Current Liabilities:
Accounts payable and accrued liabilities	100,253	71,638
Amounts payable to oil and gas property owners	44,004	37,922
Production taxes payable	58,455	61,507
Derivative liabilities	0	4,411
Total current liabilities	202,712	175,478
Long-term debt, net of debt issuance costs	714,292	758,911
Asset retirement obligations	23,407	23,491
Deferred income taxes	2,137	97,418
Other noncurrent liabilities	14,982	17,436
Commitments and contingencies (Note 11)
Stockholders' Equity:
Common stock, $0.001 par value; authorized 400,000,000 shares; 215,064,108 and 213,669,597 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively, with 3,531,812 and 2,968,497 shares subject to restrictions, respectively	212	211
Additional paid-in capital	1,778,571	1,777,779
Retained earnings (accumulated deficit)	(1,710,311)	(694,672)
Treasury stock, at cost: zero shares at March 31, 2020 and December 31, 2019	0	0
Total stockholders' equity	68,472	1,083,318
Total liabilities and stockholders' equity	$ 1,026,002	$ 2,156,052