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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income (loss) $ 79,894 $ (277,198)
Adjustments to reconcile net income (loss) to net cash provided by operating activities    
Provision for doubtful accounts (2,329) 469
Depreciation, depletion, and amortization 11,272 51,799
Impairment 0 253,797
Debt issuance costs amortization 57 477
Write off of debt issuance costs 174 0
(Gain) loss on derivative contracts 4,129 (7,168)
Cash received on settlement of derivative contracts 0 11,197
(Gain) loss on sale of assets (18,952) (100)
Stock-based compensation 1,036 2,753
Other 107 114
Changes in operating assets and liabilities (9,073) (8,784)
Net cash provided by (used in) operating activities 66,315 27,356
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures for property, plant and equipment (8,615) (8,110)
Acquisition of assets (3,545) (3,276)
Purchase of other property and equipment (59) 0
Proceeds from sale of assets 38,086 37,243
Net cash provided by (used in) investing activities 25,867 25,857
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from borrowings 0 39,000
Repayments of borrowings (20,000) (84,500)
Reduction of financing lease liability (493) (977)
Debt issuance costs (75) 0
Proceeds from exercise of stock options 21 0
Cash paid for tax obligations on vested stock awards (899) (63)
Net cash provided by (used in) financing activities (21,446) (46,540)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS and RESTRICTED CASH 70,736 6,673
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year 28,266 5,968
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period 99,002 12,641
Supplemental Disclosure of Cash Flow Information    
Cash paid for interest, net of amounts capitalized (168) (1,271)
Cash received for income taxes 0 616
Supplemental Disclosure of Noncash Investing and Financing Activities    
Purchase of PP&E in accounts payable 2,169 683
Right-of-use assets obtained in exchange for financing lease obligations 960 67
Carrying value of properties exchanged $ 0 $ 3,890