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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 $ 48,617 $ 8,418
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 28,308 11,544
Amortization of deferred loan costs 630 466
Stock-based compensation 3,099 2,751
Provision for bad debts 44 75
Loss on disposition of assets 138 5
Write off of unamortized debt issuance costs   95
Deferred income taxes 1  
Changes in operating assets and liabilities:    
Receivables (4,936) 100
Income taxes receivable 3,571 1,639
Inventories 1,706 (613)
Prepaid expenses 1,721 37
Right of use asset, net (13) (2)
Accounts payable 3,281 (5,755)
Accrued expenses 10,110 525
Net cash provided by operating activities 96,277 19,285
Cash flows from investing activities:    
Proceeds from sale of assets 20 25
Change in construction accounts payable 5,309 (6,135)
Acquisition of property and equipment (26,992) (30,237)
Net cash used in investing activities (21,663) (36,347)
Cash flows from financing activities:    
Payroll taxes from net exercise of stock options (730)  
Proceeds from exercise of stock options 5,342 1,161
Long-term debt borrowings   8,750
Principal payments on long-term debt (74,500) (20,000)
Loan issuance cost   (2,862)
Net cash used in financing activities (69,888) (12,951)
Change in cash and cash equivalents 4,726 (30,013)
Cash and cash equivalents at beginning of period 28,310 60,539
Cash and cash equivalents at end of period 33,036 30,526
Supplemental disclosure of cash flow information:    
Cash paid for interest, net of amounts capitalized 2,707  
Cash paid for income taxes $ 8,100  
Conversion of long term deposit to short term deposit   $ 908