CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 170	$ 200,227
Restricted cash	11,578	13,556
Accounts receivable, net	136,738	209,023
Income taxes receivable	156,815	129,795
Inventories	14,929	13,932
Other current assets	2,322	1,715
Total current assets	322,552	568,248
Properties and equipment, net (Successful efforts method)	4,034,680	3,855,706
Other assets	62,073	63,291
TOTAL ASSETS	4,419,305	4,487,245
Current liabilities
Accounts payable	151,662	189,811
Current portion of long-term debt	188,000	87,000
Accrued liabilities	28,396	31,290
Interest payable	6,242	19,933
Derivative instruments	11,628	0
Total current liabilities	385,928	328,034
Long-term debt, net	973,712	1,133,025
Deferred income taxes	748,489	702,104
Asset retirement obligations	83,670	71,598
Postretirement benefits	33,749	32,713
Other liabilities	75,269	68,284
Total liabilities	2,300,817	2,335,758
Commitments and contingencies
Stockholders' equity
Common stock	47,754	47,688
Additional paid-in capital	1,800,002	1,782,427
Retained earnings	2,093,004	2,143,213
Accumulated other comprehensive income	929	1,360
Treasury stock	(1,823,201)	(1,823,201)
Total stockholders' equity	2,118,488	2,151,487
Total liabilities and stockholders' equity	$ 4,419,305	$ 4,487,245