CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 16,449	$ 32,774
Accounts receivable, net of allowance for doubtful accounts	62,120	72,943
Derivative assets	3,916	81,166
Prepayments and other current assets	3,952	2,898
Total current assets	86,437	189,781
Property and equipment — at cost, successful efforts method for oil and gas properties:
Proved oil and gas properties	2,644,129	2,195,310
Unproved oil and gas properties, excluded from amortization	357,793	468,208
Furniture, equipment and other	29,804	20,662
Property, plant and equipment, gross	3,031,726	2,684,180
Accumulated depreciation, depletion, amortization and impairment	967,552	654,657
Total property and equipment, net	2,064,174	2,029,523
Derivative assets	0	27,289
Other noncurrent assets	5,441	5,867
Total	2,156,052	2,252,460
Current liabilities:
Accounts payable and accrued liabilities	71,638	131,379
Amounts payable to oil and gas property owners	37,922	55,792
Production taxes payable	61,507	59,155
Derivative liabilities	4,411	0
Current portion of long-term debt	0	1,859
Total current liabilities	175,478	248,185
Long-term debt, net of debt issuance costs	758,911	617,387
Asset retirement obligations	23,491	27,330
Deferred income taxes	97,418	139,534
Other noncurrent liabilities	17,436	7,926
Commitments and contingencies (Note 14)
Stockholders' equity:
Common stock, $0.001 par value; authorized 400,000,000 shares; 213,669,597 and 212,477,101 shares issued and outstanding at December 31, 2019 and 2018, respectively, with 2,968,497 and 2,912,166 shares subject to restrictions, respectively	211	210
Additional paid-in capital	1,777,779	1,771,730
Retained earnings (accumulated deficit)	(694,672)	(559,842)
Treasury stock, at cost: zero shares at December 31, 2019 and 2018	0	0
Total stockholders' equity	1,083,318	1,212,098
Total	$ 2,156,052	$ 2,252,460