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CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets |  |
Cash and cash equivalents | $ 2,287 | $ 480,047
Accounts receivable, net | 362,403 | 216,004
Income taxes receivable | 109,251 | 56,666
Inventories | 11,076 | 8,006
Derivative instruments | 57,665 | 0
Current assets held for sale | 0 | 1,440
Other current assets | 1,863 | 2,794
Total current assets | 544,545 | 764,957
Properties and equipment, net (Successful efforts method) | 3,463,606 | 3,072,204
Equity method investments | 163,181 | 86,077
Assets held for sale | 0 | 778,855
Derivative instruments | 0 | 2,239
Other assets | 27,497 | 23,012
TOTAL ASSETS | 4,198,829 | 4,727,344
Current liabilities |  |
Accounts payable | 241,939 | 238,045
Current portion of long-term debt | 0 | 304,000
Accrued liabilities | 25,227 | 27,441
Interest payable | 20,098 | 27,575
Derivative instruments | 0 | 30,637
Current liabilities held for sale | 0 | 2,352
Total current liabilities | 287,264 | 630,050
Long-term debt, net | 1,226,104 | 1,217,891
Deferred income taxes | 458,597 | 227,030
Asset retirement obligations | 50,622 | 43,601
Liabilities held for sale | 0 | 15,748
Postretirement benefits | 27,912 | 29,396
Other liabilities | 60,171 | 39,723
Total liabilities | 2,110,670 | 2,203,439
Commitments and contingencies |  |
Stockholders' equity |  |
Common stock | 47,610 | 47,555
Additional paid-in capital | 1,763,142 | 1,742,419
Retained earnings | 1,607,658 | 1,162,430
Accumulated other comprehensive income | 4,437 | 2,077
Treasury stock | (1,334,688) | (430,576)
Total stockholders' equity | 2,088,159 | 2,523,905
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ 4,198,829 | $ 4,727,344

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