CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 498,542	$ 514
Accounts receivable, net	191,045	120,229
Income taxes receivable	10,298	4,323
Inventories	13,304	17,049
Other current assets	2,692	2,671
Total current assets	715,881	144,786
Properties and equipment, net (Successful efforts method)	4,250,125	4,976,879
Equity method investments	129,524	103,517
Other assets	27,039	27,856
TOTAL ASSETS	5,122,569	5,253,038
Current liabilities
Accounts payable	168,411	160,407
Current portion of long-term debt	0	20,000
Accrued liabilities	21,492	24,923
Interest payable	27,650	30,222
Derivative instruments	40,259	0
Total current liabilities	257,812	235,552
Long-term debt, net	1,520,530	1,996,139
Deferred income taxes	579,447	807,236
Asset retirement obligations	131,733	143,606
Postretirement benefits	36,259	35,293
Other liabilities	29,121	26,024
Total liabilities	2,554,902	3,243,850
Commitments and contingencies
Stockholders' equity
Common stock: Authorized -- 960,000,000 shares of $0.10 par value in 2016 and 2015 Issued - 423,768,593 and 423,768,593 shares in 2016 and 2015, respectively	47,504	42,377
Additional paid-in capital	1,727,310	721,997
Retained earnings	1,098,703	1,552,014
Accumulated other comprehensive income (loss)	985	(365)
Less treasury stock, at cost: 9,892,680 shares in 2016 and 2015, respectively	(306,835)	(306,835)
Total stockholders' equity	2,567,667	2,009,188
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 5,122,569	$ 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).