Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash	$ 48,135	$ 57,916
Restricted cash	38,785	33,467
Accounts receivable
Oil and natural gas revenues	164,242	85,098
Joint interest billings	48,366	34,823
Other	28,808	17,212
Derivative instruments	1,971	6,727
Lease and well equipment inventory	12,188	10,584
Prepaid expenses and other current assets	28,810	15,802
Total current assets	371,305	261,629
Oil and natural gas properties, full-cost method
Evaluated	6,007,325	5,295,931
Unproved and unevaluated	964,714	902,133
Midstream properties	900,979	841,695
Midstream properties	30,123	29,561
Less accumulated depletion, depreciation and amortization	(4,046,456)	(3,701,551)
Net property and equipment	3,856,685	3,367,769
Other assets
Derivative instruments	0	2,570
Other long-term assets	34,163	55,312
Total assets	4,262,153	3,687,280
Current liabilities
Accounts payable	26,256	13,982
Accrued liabilities	253,283	119,158
Royalties payable	94,359	66,049
Amounts due to affiliates	27,324	4,934
Derivative instruments	16,849	45,186
Advances from joint interest owners	18,074	4,191
Other current liabilities	28,692	37,436
Total current liabilities	464,837	290,936
Long-term liabilities
Borrowings under Credit Agreement	100,000	440,000
Borrowings under San Mateo Credit Facility	385,000	334,000
Senior unsecured notes payable	1,042,580	1,040,998
Asset retirement obligations	41,689	37,919
Deferred income taxes	77,938	0
Other long-term liabilities	22,721	30,402
Total long-term liabilities	1,669,928	1,883,319
Commitments and contingencies (Note 14)
Shareholders' equity
Common stock — $0.01 par value, 160,000,000 shares authorized; 117,861,923 and 116,847,003 shares issued; and 117,850,233 and 116,844,768 shares outstanding, respectively	1,179	1,169
Additional paid-in capital	2,077,592	2,027,069
Accumulated deficit	(171,318)	(741,705)
Treasury stock, at cost, 11,945 and 2,235 shares, respectively	(243)	(3)
Total shareholders' equity	1,907,210	1,286,530
Non-controlling interest in subsidiaries	220,178	226,495
Total shareholders’ equity	2,127,388	1,513,025
Total liabilities and shareholders’ equity	$ 4,262,153	$ 3,687,280