CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 517,490	$ 514
Accounts receivable, net	118,048	120,229
Income taxes receivable	4,187	4,323
Inventories	14,985	17,049
Other current assets	4,528	2,671
Total current assets	659,238	144,786
Properties and equipment, net (Successful efforts method)	4,762,680	4,976,879
Equity method investments	123,623	103,517
Other assets	24,929	27,856
TOTAL ASSETS	5,570,470	5,253,038
Current liabilities
Accounts payable	142,501	160,407
Current portion of long-term debt	20,000	20,000
Accrued liabilities	19,344	24,923
Interest payable	28,144	30,222
Derivative instruments	18,501	0
Total current liabilities	228,490	235,552
Postretirement benefits	36,937	35,293
Long-term debt, net	1,519,849	1,996,139
Deferred income taxes	745,085	807,236
Asset retirement obligations	133,066	143,606
Other liabilities	29,444	26,024
Total liabilities	2,692,871	3,243,850
Commitments and contingencies
Stockholders' equity
Issued — 475,040,914 shares and 423,768,593 shares in 2016 and 2015, respectively	47,504	42,377
Additional paid-in capital	1,716,933	721,997
Retained earnings	1,420,328	1,552,014
Accumulated other comprehensive income (loss)	(331)	(365)
Less treasury stock, at cost: 9,892,680 shares in 2016 and 2015, respectively	(306,835)	(306,835)
Total stockholders' equity	2,877,599	2,009,188
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 5,570,470	$ 5,253,038

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
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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).