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CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
ASSETS |  |
Cash and cash equivalents | $ 19,727 | $ 30,272
Accounts receivable: |  |
Oil and gas sales | 144,358 | 125,016
Joint interest operations | 23,781 | 14,615
From affiliates | 17,837 | 6,155
Derivative financial instruments | 10,765 | 8,913
Other current assets | 8,410 | 14,839
Total current assets | 224,878 | 199,810
Oil and natural gas properties, successful efforts method: |  |
Proved | 4,981,955 | 4,647,188
Unproved | 339,278 | 332,765
Other | 6,731 | 6,858
Accumulated depreciation, depletion and amortization | (1,132,191) | (902,261)
Net property and equipment | 4,195,773 | 4,084,550
Goodwill | 335,897 | 335,897
Derivative financial instruments | 830 | 661
Operating lease right-of-use assets | 6,833 | 3,025
Other assets | 37 | 40
Total assets | 4,764,248 | 4,623,983
LIABILITIES AND STOCKHOLDERS' EQUITY |  |
Accounts payable | 292,998 | 259,284
Accrued costs | 105,210 | 133,019
Operating leases | 2,190 | 2,284
Derivative financial instruments | 255,127 | 47,005
Total current liabilities | 655,525 | 441,592
Long-term debt | 2,847,309 | 2,517,149
Deferred income taxes | 99,245 | 200,583
Derivative financial instruments | 14,157 | 2,364
Long-term operating leases | 4,674 | 740
Reserve for future abandonment costs | 20,748 | 19,290
Other non-current liabilities | 180 | 492
Total liabilities | 3,641,838 | 3,182,210
Commitments and contingencies |  |
Stockholders' equity: |  |
Common stock—$0.50 par, 400,000,000 shares authorized, 232,850,477 and 232,414,718 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively | 116,425 | 116,206
Additional paid-in capital | 1,098,300 | 1,095,384
Accumulated earnings (deficit) | (267,315) | 55,183
Total stockholders' equity | 947,410 | 1,266,773
Total liabilities and stockholders' equity | 4,764,248 | 4,623,983
Series B 10% Convertible Preferred Stock |  |
Mezzanine equity: |  |
Series B 10% Convertible Preferred stock — 5,000,000 shares authorized, 175,000 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively | $ 175,000 | $ 175,000

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