CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 377,724	$ 245,799
Restricted cash	4,417	4,417
Receivables:
Oil and natural gas sales	99,155	54,919
Joint interest, net	13,370	9,745
Total receivables	112,525	64,664
Prepaid expenses and other assets (Note 1)	53,073	43,379
Total current assets	547,739	358,259
Oil and natural gas properties and other, net (Note 1)	741,390	665,252
Restricted deposits for asset retirement obligations	21,667	16,019
Deferred income taxes	75,474	102,505
Other assets (Note 1)	53,538	51,172
Total assets	1,439,808	1,193,207
Current liabilities:
Accounts payable	81,031	67,409
Undistributed oil and natural gas proceeds	51,215	36,243
Advances from joint interest partners	5,259	15,072
Asset retirement obligations	51,504	56,419
Accrued liabilities (Note 1)	153,967	106,140
Current portion of long-term debt	37,199	42,960
Income tax payable	3,356	133
Total current liabilities	383,531	324,376
Long-term debt, net (Note 2)	671,974	687,938
Asset retirement obligations, less current portion	409,265	368,076
Other liabilities (Note 1)	94,257	55,389
Deferred income taxes	113	113
Commitments and contingencies (Note 12)	5,037	4,495
Shareholders' deficit:
Preferred stock, $0.00001 par value; 20,000 shares authorized; none issued at June 30, 2022 and December 31, 2021
Common stock, $0.00001 par value; 200,000 shares authorized; 146,024 issued and 143,154 outstanding at June 30, 2022; 145,732 issued and 142,863 outstanding at December 31, 2021	1	1
Additional paid-in capital	554,755	552,923
Retained deficit	(654,958)	(775,937)
Treasury stock, at cost; 2,869 shares at June 30, 2022 and December 31, 2021	(24,167)	(24,167)
Total shareholders' deficit	(124,369)	(247,180)
Total liabilities and shareholders' deficit	$ 1,439,808	$ 1,193,207