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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net income $ 19,864 $ 18,275
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,215 12,487
Amortization of deferred loan costs 64  
Stock-based compensation - stock options 2,127 1,778
Provision for bad debts 9 44
Loss (gain) on disposition of assets (4) (37)
Non-cash operating lease expense (2) 8
Changes in operating assets and liabilities:    
Receivables (1,776) 1,681
Income taxes receivable 5,770 5,542
Inventories 1,032 248
Prepaid expenses and other 1,332 1,648
Accounts payable (2,440) (1,644)
Accrued expenses (2,729) (1,743)
Net cash provided by operating activities 36,462 38,287
Cash flows from investing activities:    
Proceeds from sale of assets 4 49
Change in construction accounts payable 3,787 (310)
Acquisition of property and equipment (19,819) (17,622)
Net cash used in investing activities (16,028) (17,883)
Cash flows from financing activities:    
Payroll taxes from net exercise of stock options   (38)
Proceeds from exercise of stock options 1,434 1,007
Line-of-credit borrowings   9,500
Line-of-credit payments   (9,500)
Payment of dividends (5,538) (5,676)
Purchase of company common stock   (19,574)
Net cash used in financing activities (4,104) (24,281)
Change in cash and cash equivalents 16,330 (3,877)
Cash and cash equivalents at beginning of period 58,760  
Cash and cash equivalents at end of period 75,090 39,484
Supplemental disclosure of cash flow information:    
Cash paid for interest $ 61 $ 78