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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 6,752 $ 179,928
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 321,392 224,379
Stock-based compensation expense 21,351 14,329
Impairment and abandonment expense 42,427 10,396
Exploratory dry hole costs 0 395
Deferred tax expense 5,058 50,729
Net loss on sale of long-lived assets 15 74
Non-cash portion of derivative (gain) loss 14 (579)
Amortization of debt issuance costs and discount 2,070 1,258
Changes in operating assets and liabilities:    
(Increase) decrease in accounts receivable (47,771) (18,327)
(Increase) decrease in prepaid and other assets (995) (52)
Increase (decrease) in accounts payable and other liabilities 34,562 32,165
Net cash provided by operating activities 384,875 494,695
Cash flows from investing activities:    
Acquisition of oil and natural gas properties (73,346) (114,870)
Drilling and development capital expenditures (644,945) (723,100)
Purchases of other property and equipment (8,207) (4,409)
Proceeds from sales of oil and natural gas properties 28,378 147,413
Net cash used in investing activities (698,120) (694,966)
Cash flows from financing activities:    
Proceeds from borrowings under revolving credit facility 345,000 295,000
Repayment of borrowings under revolving credit facility (525,000) (155,000)
Proceeds from issuance of 2027 Senior Notes 496,175 0
Debt issuance costs (7,200) (4,217)
Proceeds from stock options exercised 0 847
Restricted stock used for tax withholdings (911) (1,119)
Net cash provided by financing activities 308,064 135,511
Net decrease in cash, cash equivalents and restricted cash (5,181) (64,760)
Cash, cash equivalents and restricted cash, beginning of period 21,422 125,915
Cash, cash equivalents and restricted cash, end of period 16,241 61,155
Supplemental cash flow information    
Cash paid for interest 27,985 15,587
Operating cash flows from operating leases 16,808 0
Investing cash flows from operating leases 13,946 0
Supplemental non-cash activity    
Accrued capital expenditures included in accounts payable and accrued expenses 120,238 97,844
Asset retirement obligations incurred, including revisions to estimates 1,075 1,040
Right-of-use assets obtained in exchange for operating lease liabilities 35,686 0
Total cash, cash equivalents and restricted cash $ 21,422 $ 125,915