CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 200,227	$ 2,287
Restricted cash	13,556	0
Accounts receivable, net	209,023	362,403
Income taxes receivable	129,795	109,251
Inventories	13,932	11,076
Derivative instruments	31	57,665
Other current assets	1,684	1,863
Total current assets	568,248	544,545
Properties and equipment, net (Successful efforts method)	3,855,706	3,463,606
Equity method investments	0	163,181
Other assets	63,291	27,497
TOTAL ASSETS	4,487,245	4,198,829
Current liabilities
Accounts payable	189,811	241,939
Current portion of long-term debt	87,000	0
Accrued liabilities	31,290	25,227
Interest payable	19,933	20,098
Total current liabilities	328,034	287,264
Long-term debt, net	1,133,025	1,226,104
Deferred income taxes	702,104	458,597
Asset retirement obligations	71,598	50,622
Postretirement benefits	32,713	27,912
Other liabilities	68,284	60,171
Total liabilities	2,335,758	2,110,670
Commitments and contingencies
Stockholders' equity
Common stock: Authorized — 960,000,000 shares of $0.10 par value in 2019 and 2018, respectively and Issued — 476,881,991 shares and 476,094,551 shares in 2019 and 2018, respectively	47,688	47,610
Additional paid-in capital	1,782,427	1,763,142
Retained earnings	2,143,213	1,607,658
Accumulated other comprehensive income	1,360	4,437
Less treasury stock, at cost: 78,957,318 shares and 53,409,705 shares in 2019 and 2018, respectively	(1,823,201)	(1,334,688)
Total stockholders' equity	2,151,487	2,088,159
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 4,487,245	$ 4,198,829

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).