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CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
ASSETS |  |
Cash and cash equivalents | $ 28,268 | $ 18,532
Accounts receivable: |  |
Oil and gas sales | 87,965 | 120,111
Joint interest operations | 10,792 | 24,761
From affiliates | 2,202 | 35,469
Derivative financial instruments | 8,830 | 75,304
Income taxes receivable | 0 | 5,109
Other current assets | 11,773 | 10,399
Total current assets | 149,830 | 289,685
Oil and natural gas properties, successful efforts method: |  |
Proved | 4,419,285 | 4,077,513
Unproved | 384,763 | 410,897
Other | 6,588 | 6,866
Accumulated depreciation, depletion and amortization | (798,288) | (486,473)
Net property and equipment | 4,012,348 | 4,008,803
Goodwill | 335,897 | 335,897
Income taxes receivable | 0 | 5,109
Derivative financial instruments | 1,185 | 13,888
Operating lease right-of-use assets | 3,554 | 3,509
Other assets | 40 | 231
Total assets | 4,502,854 | 4,657,122
LIABILITIES AND STOCKHOLDERS' EQUITY |  |
Accounts payable | 202,174 | 252,994
Accrued costs | 112,695 | 137,166
Operating leases | 2,318 | 1,994
Derivative financial instruments | 63,595 | 222
Total current liabilities | 380,782 | 392,376
Long-term debt | 2,507,669 | 2,500,132
Deferred income taxes | 163,550 | 211,772
Derivative financial instruments | 66,373 | 4,220
Long-term operating leases | 1,236 | 1,515
Reserve for future abandonment costs | 19,402 | 18,151
Other non-current liabilities | 1,162 | 6,351
Total liabilities | 3,140,174 | 3,134,517
Commitments and contingencies |  |
Stockholders' equity: |  |
Common stock—$0.50 par, 400,000,000 shares authorized, 232,421,385 and 190,006,776 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively | 116,210 | 95,003
Additional paid-in capital | 1,093,811 | 909,423
Accumulated earnings (deficit) | (22,341) | 138,596
Total stockholders' equity | 1,187,680 | 1,143,022
Total liabilities and stockholders' equity | 4,502,854 | 4,657,122
Series A 10% Convertible Preferred Stock |  |
Mezzanine equity: |  |
Preferred Stock | 0 | 204,583
Series B 10% Convertible Preferred Stock |  |
Mezzanine equity: |  |
Preferred Stock | $ 175,000 | $ 175,000

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