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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
ASSETS |  |
Cash and cash equivalents | $ 30,663 | $ 30,272
Accounts receivable: |  |
Oil and gas sales | 217,149 | 125,016
Joint interest operations | 29,755 | 14,615
From affiliates | 20,834 | 6,155
Derivative financial instruments | 5,258 | 8,913
Other current assets | 15,077 | 14,839
Total current assets | 318,736 | 199,810
Oil and natural gas properties, successful efforts method: |  |
Proved | 4,756,394 | 4,647,188
Unproved | 302,129 | 332,765
Other | 6,690 | 6,858
Accumulated depreciation, depletion and amortization | (1,058,067) | (902,261)
Net property and equipment | 4,007,146 | 4,084,550
Goodwill | 335,897 | 335,897
Derivative financial instruments | 0 | 661
Operating lease right-of-use assets | 6,450 | 3,025
Other assets | 0 | 40
Total assets | 4,668,229 | 4,623,983
LIABILITIES AND STOCKHOLDERS' EQUITY |  |
Accounts payable | 314,569 | 259,284
Accrued expenses | 135,026 | 133,019
Operating leases | 2,444 | 2,284
Derivative financial instruments | 181,945 | 47,005
Total current liabilities | 633,984 | 441,592
Long-term debt | 2,615,235 | 2,517,149
Deferred income taxes | 197,417 | 200,583
Derivative financial instruments | 4,042 | 2,364
Long-term operating leases | 4,075 | 740
Reserve for future abandonment costs | 25,673 | 19,290
Other non-current liabilities | 24 | 492
Total liabilities | 3,480,450 | 3,182,210
Commitments and contingencies |  |
Stockholders' equity: |  |
Common stock—$0.50 par, 400,000,000 shares authorized, 232,924,646 and 232,414,718 shares issued and outstanding at December 31, 2021 and 2020, respectively | 116,462 | 116,206
Additional paid-in capital | 1,100,359 | 1,095,384
Accumulated earnings (deficit) | (204,042) | 55,183
Total stockholders' equity | 1,012,779 | 1,266,773
Total liabilities and stockholders' equity | $ 4,668,229 | $ 4,623,983
Preferred stock, shares issued (in shares) | 175,000 | 175,000
Preferred stock, shares outstanding (in shares) | 175,000 | 175,000
Series B Convertible Preferred Stock |  |
Mezzanine equity: |  |
Preferred stock | $ 175,000 | $ 175,000

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