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CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Current assets    
Cash and cash equivalents $ 510,256 $ 498,542
Accounts receivable, net 161,690 191,045
Income taxes receivable 26,963 10,298
Inventories 12,997 13,304
Other current assets 6,123 2,692
Total current assets 718,029 715,881
Properties and equipment, net (Successful efforts method) 4,234,772 4,250,125
Equity method investments 148,920 129,524
Other assets 27,045 27,039
TOTAL ASSETS 5,128,766 5,122,569
Current liabilities    
Accounts payable 160,789 168,411
Current portion of long-term debt 237,000 0
Accrued liabilities 27,314 21,492
Interest payable 12,331 27,650
Derivative instruments 800 40,259
Total current liabilities 438,234 257,812
Long-term debt, net 1,284,551 1,520,530
Deferred income taxes 638,014 579,447
Asset retirement obligations 59,605 131,733
Postretirement benefits 27,360 36,259
Other liabilities 36,408 29,121
Total liabilities 2,484,172 2,554,902
Commitments and contingencies
Stockholders' equity    
Common stock: Authorized - 960,000,000 shares of $0.10 par value in 2017 and 2016 Issued - 475,443,335 shares and 475,042,692 shares in 2017 and 2016, respectively 47,544 47,504
Additional paid-in capital 1,738,656 1,727,310
Retained earnings 1,230,002 1,098,703
Accumulated other comprehensive income 3,482 985
Less treasury stock, at cost: 12,935,926 and 9,892,680 shares in 2017 and 2016, respectively (375,090) (306,835)
Total stockholders' equity 2,644,594 2,567,667
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 5,128,766 $ 5,122,569