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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:      
Net income $ 87,479 $ 68,488 $ 23,678
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 43,433 38,428 17,324
Amortization of deferred loan costs 1,541 990 764
Stock-based compensation 5,095 4,060 3,855
Stock Based Compensation - Restricted Stock 80    
Provision for bad debts 155 245 159
(Gain) loss on disposition of assets (69) 136 63
Write off of unamortized debt issuance costs     95
Non-cash operating lease expense 9 (16) (1)
Deferred income taxes 3,399 6,527 15,774
Changes in operating assets and liabilities:      
Receivables (840) (5,390) 1,563
Income taxes receivable 1,957 (2,052) (24,709)
Inventories (399) 664 (1,088)
Prepaid expenses (985) 841 (1,247)
Accounts payable (4,157) 6,920 (5,382)
Accrued expenses 3,070 8,262 596
Net cash provided by operating activities 139,768 128,103 31,444
Cash flows from investing activities:      
Proceeds from sale of assets 440 22 31
Change in construction accounts payable (8,934) 9,120 42,243
Acquisition of property and equipment (39,477) (46,928) (88,667)
Net cash used in investing activities (47,971) (37,786) (46,393)
Cash flows from financing activities:      
Payroll taxes from net exercise of stock options (6,885) (730) (4,428)
Proceeds from exercise of stock options 9,841 8,129 3,760
Line-of-credit borrowings 3,000    
Line-of-credit payments (3,000)    
Long-term debt borrowings     10,813
Principal payments on long-term debt (83,000) (92,500) (24,563)
Loan issuance cost     (2,862)
Purchase of company common stock (6,500)    
Net cash used in financing activities (86,544) (85,101) (17,280)
Change in cash and cash equivalents 5,253 5,216 (32,229)
Cash and cash equivalents at beginning of period 33,526 28,310 60,539
Cash and cash equivalents at end of period 38,779 33,526 28,310
Supplemental disclosure of cash flow information:      
Cash paid for interest, net of amounts capitalized 1,450 3,069 380
Cash paid for income taxes $ 15,620 $ 12,410  
Conversion of long-term deposit to short term deposit     $ 908