CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 514	$ 20,954
Accounts receivable, net	120,229	235,397
Income taxes receivable	4,323	3,612
Inventories	17,049	14,026
Derivative instruments	0	137,603
Other current assets	2,671	1,855
Total current assets	144,786	413,447
Properties and equipment, net (Successful efforts method)	4,976,879	4,925,711
Equity method investments	103,517	68,029
Other assets	36,717	30,529
TOTAL ASSETS	5,261,899	5,437,716
Current liabilities
Accounts payable	160,407	400,076
Current portion of long-term debt	20,000	0
Accrued liabilities	24,923	32,992
Interest payable	30,222	30,677
Deferred income taxes	0	35,273
Total current liabilities	235,552	499,018
Postretirement benefits	35,293	35,827
Long-term debt	2,005,000	1,752,000
Deferred income taxes	807,236	843,876
Asset retirement obligations	143,606	124,655
Other liabilities	26,024	39,607
Total liabilities	$ 3,252,711	$ 3,294,983
Commitments and contingencies
Stockholders' equity
Common stock: Authorized -- 960,000,000 shares of $0.10 par value in 2015 and 2014 Issued - 423,768,593 and 422,915,258 shares in 2015 and 2014, respectively	$ 42,377	$ 42,292
Additional paid-in capital	721,997	710,432
Retained earnings	1,552,014	1,698,995
Accumulated other comprehensive income (loss)	(365)	(2,151)
Less treasury stock, at cost: 9,892,680 shares in 2015 and 2014, respectively	(306,835)	(306,835)
Total stockholders' equity	2,009,188	2,142,733
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 5,261,899	$ 5,437,716