CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 314,889	$ 2,287
Accounts receivable, net	220,732	362,403
Income taxes receivable	111,303	109,251
Inventories	18,277	11,076
Derivative instruments	14,246	57,665
Other current assets	744	1,863
Total current assets	680,191	544,545
Properties and equipment, net (Successful efforts method)	3,574,622	3,463,606
Equity method investments	163,964	163,181
Other assets	62,770	27,497
TOTAL ASSETS	4,481,547	4,198,829
Current liabilities
Accounts payable	204,544	241,939
Accrued liabilities	27,255	25,227
Interest payable	7,211	20,098
Derivative instruments	1,305	0
Total current liabilities	240,315	287,264
Long-term debt, net	1,219,338	1,226,104
Deferred income taxes	546,559	458,597
Asset retirement obligations	53,701	50,622
Postretirement benefits	28,421	27,912
Other liabilities	72,274	60,171
Total liabilities	2,160,608	2,110,670
Commitments and contingencies
Stockholders' equity
Common stock	47,678	47,610
Additional paid-in capital	1,762,861	1,763,142
Retained earnings	1,840,816	1,607,658
Accumulated other comprehensive income	4,300	4,437
Treasury Stock	(1,334,716)	(1,334,688)
Total stockholders' equity	2,320,939	2,088,159
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 4,481,547	$ 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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Namespace Prefix:	us-gaap_
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).