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CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
ASSETS    
Cash and cash equivalents $ 77,435 $ 30,272
Accounts receivable:    
Oil and gas sales 126,503 125,016
Joint interest operations 13,348 14,615
From affiliates 12,967 6,155
Derivative financial instruments 4,627 8,913
Other current assets 9,163 14,839
Total current assets 244,043 199,810
Oil and natural gas properties, successful efforts method:    
Proved 4,812,130 4,647,188
Unproved 336,674 332,765
Other 6,707 6,858
Accumulated depreciation, depletion and amortization (1,011,065) (902,261)
Net property and equipment 4,144,446 4,084,550
Goodwill 335,897 335,897
Derivative financial instruments 3,524 661
Operating lease right-of-use assets 7,201 3,025
Other assets 37 40
Total assets 4,735,148 4,623,983
LIABILITIES AND STOCKHOLDERS' EQUITY    
Accounts payable 280,696 259,284
Accrued costs 89,923 133,019
Operating leases 2,145 2,284
Derivative financial instruments 60,820 47,005
Total current liabilities 433,584 441,592
Long-term debt 2,800,478 2,517,149
Deferred income taxes 170,433 200,583
Derivative financial instruments 198 2,364
Long-term operating leases 5,068 740
Reserve for future abandonment costs 19,915 19,290
Other non-current liabilities 479 492
Total liabilities 3,430,155 3,182,210
Commitments and contingencies
Stockholders' equity:    
Common stock—$0.50 par, 400,000,000 shares authorized, 232,411,218 and 232,414,718 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively 116,206 116,206
Additional paid-in capital 1,097,044 1,095,384
Accumulated earnings (deficit) (83,257) 55,183
Total stockholders' equity 1,129,993 1,266,773
Total liabilities and stockholders' equity 4,735,148 4,623,983
Series B 10% Convertible Preferred Stock    
Mezzanine equity:    
Preferred Stock $ 175,000 $ 175,000