CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 82,316	$ 2,287
Accounts receivable, net	159,239	362,403
Income taxes receivable	133,028	109,251
Inventories	18,195	11,076
Derivative instruments	25,700	57,665
Other current assets	3,201	1,863
Total current assets	421,679	544,545
Properties and equipment, net (Successful efforts method)	3,787,581	3,463,606
Equity method investments	169,086	163,181
Other assets	64,319	27,497
TOTAL ASSETS	4,442,665	4,198,829
Current liabilities
Accounts payable	172,732	241,939
Current portion of long-term debt	87,000	0
Accrued liabilities	27,780	25,227
Interest payable	7,273	20,098
Total current liabilities	294,785	287,264
Long-term debt, net	1,132,790	1,226,104
Deferred income taxes	647,473	458,597
Asset retirement obligations	56,968	50,622
Postretirement benefits	29,427	27,912
Other liabilities	67,646	60,171
Total liabilities	2,229,089	2,110,670
Commitments and contingencies
Stockholders' equity
Common stock	47,688	47,610
Additional paid-in capital	1,775,579	1,763,142
Retained earnings	2,037,066	1,607,658
Accumulated other comprehensive income	4,027	4,437
Treasury Stock	(1,650,784)	(1,334,688)
Total stockholders' equity	2,213,576	2,088,159
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 4,442,665	$ 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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).