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CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets |  |
Cash and cash equivalents | $ 740,994 | $ 480,047
Accounts receivable, net | 180,545 | 216,004
Income taxes receivable | 41,512 | 56,666
Inventories | 20,470 | 8,006
Current assets held for sale | 0 | 1,440
Other current assets | 3,892 | 2,794
Total current assets | 987,413 | 764,957
Properties and equipment, net (Successful efforts method) | 3,225,493 | 3,072,204
Equity method investments | 147,984 | 86,077
Assets held for sale | 6,828 | 778,855
Derivative instruments | 3,412 | 2,239
Other assets | 25,580 | 23,012
TOTAL ASSETS | 4,396,710 | 4,727,344
Current liabilities |  |
Accounts payable | 235,978 | 238,045
Current portion of long-term debt | 304,000 | 304,000
Accrued liabilities | 13,817 | 27,441
Interest payable | 27,360 | 27,575
Derivative instruments | 9,589 | 30,637
Current liabilities held for sale | 0 | 2,352
Total current liabilities | 590,744 | 630,050
Long-term debt, net | 1,218,572 | 1,217,891
Deferred income taxes | 293,927 | 227,030
Asset retirement obligations | 46,527 | 43,601
Liabilities held for sale | 1,867 | 15,748
Postretirement benefits | 30,351 | 29,396
Other liabilities | 60,548 | 39,723
Total liabilities | 2,242,536 | 2,203,439
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 | 47,609 | 47,555
Additional paid-in capital | 1,749,437 | 1,742,419
Retained earnings | 1,266,928 | 1,162,430
Accumulated other comprehensive income (loss) | 2,248 | 2,077
Less treasury stock, at cost: 12,935,926 and 9,892,680 shares in 2017 and 2016, respectively | (912,048) | (430,576)
Total stockholders' equity | 2,154,174 | 2,523,905
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ 4,396,710 | $ 4,727,344

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