Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash	$ 57,916	$ 40,024
Restricted cash	33,467	25,104
Accounts receivable
Oil and natural gas revenues	85,098	95,228
Joint interest billings	34,823	67,546
Other	17,212	26,639
Derivative instruments	6,727	0
Lease and well equipment inventory	10,584	10,744
Prepaid expenses and other current assets	15,802	13,207
Total current assets	261,629	278,492
Oil and natural gas properties, full-cost method
Evaluated	5,295,931	4,557,265
Unproved and unevaluated	902,133	1,126,992
Midstream properties	841,695	643,903
Midstream properties	29,561	27,021
Less accumulated depletion, depreciation and amortization	(3,701,551)	(2,655,586)
Net property and equipment	3,367,769	3,699,595
Other assets
Derivative instruments	2,570	0
Other long-term assets	55,312	91,589
Total assets	3,687,280	4,069,676
Current liabilities
Accounts payable	13,982	25,230
Accrued liabilities	119,158	200,695
Royalties payable	66,049	85,193
Amounts due to affiliates	4,934	19,606
Derivative instruments	45,186	1,897
Advances from joint interest owners	4,191	14,837
Amounts due to joint ventures	0	486
Other current liabilities	37,436	51,828
Total current liabilities	290,936	399,772
Long-term liabilities
Borrowings under Credit Agreement	440,000	255,000
Borrowings under San Mateo Credit Facility	334,000	288,000
Senior unsecured notes payable	1,040,998	1,039,416
Asset retirement obligations	37,919	35,592
Derivative instruments	0	1,984
Deferred income taxes	0	37,329
Other long-term liabilities	30,402	43,131
Total long-term liabilities	1,883,319	1,700,452
Commitments and contingencies (Note 14)
Shareholders' equity
Common stock — $0.01 par value, 160,000,000 shares authorized; 116,847,003 and 116,644,246 shares issued; and 116,844,768 and 116,642,899 shares outstanding, respectively	1,169	1,166
Additional paid-in capital	2,027,069	1,981,014
Accumulated deficit	(741,705)	(148,500)
Treasury stock, at cost, 2,235 and 1,347 shares, respectively	(3)	(26)
Total shareholders' equity	1,286,530	1,833,654
Non-controlling interest in subsidiaries	226,495	135,798
Total shareholders’ equity	1,513,025	1,969,452
Total liabilities and shareholders’ equity	$ 3,687,280	$ 4,069,676