CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 501,193	$ 514
Accounts receivable, net	121,301	120,229
Income taxes receivable	15,558	4,323
Inventories	13,487	17,049
Other current assets	4,106	2,671
Total current assets	655,645	144,786
Properties and equipment, net (Successful efforts method)	4,722,598	4,976,879
Equity method investments	127,901	103,517
Other assets	25,777	27,856
TOTAL ASSETS	5,531,921	5,253,038
Current liabilities
Accounts payable	160,142	160,407
Current portion of long-term debt	0	20,000
Accrued liabilities	18,199	24,923
Interest payable	12,604	30,222
Derivative instruments	5,818	0
Total current liabilities	196,763	235,552
Long-term debt, net	1,520,190	1,996,139
Deferred income taxes	749,976	807,236
Asset retirement obligations	134,701	143,606
Postretirement benefits	37,623	35,293
Other liabilities	29,418	26,024
Total liabilities	2,668,671	3,243,850
Commitments and contingencies
Stockholders' equity
Issued — 475,041,453 shares and 423,768,593 shares in 2016 and 2015, respectively	47,504	42,377
Additional paid-in capital	1,722,129	721,997
Retained earnings	1,400,765	1,552,014
Accumulated other comprehensive income (loss)	(313)	(365)
Less treasury stock, at cost: 9,892,680 shares in 2016 and 2015, respectively	(306,835)	(306,835)
Total stockholders' equity	2,863,250	2,009,188
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 5,531,921	$ 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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- 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).