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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 78,448 $ 68,558
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 40,842 37,994
Amortization of deferred loan costs 130  
Stock-based compensation - stock options 6,080 5,589
Provision for bad debts 30 234
Loss (gain) on disposition of assets 23 268
Non-cash operating lease expense (15) 23
Changes in operating assets and liabilities:    
Receivables 1,277 (136)
Income taxes receivable 1,575 957
Inventories 817 (45)
Prepaid expenses and other 318 1,641
Accounts payable (660) (9,774)
Accrued expenses (2,253) (2,399)
Net cash provided by operating activities 126,612 102,910
Cash flows from investing activities:    
Proceeds from sale of assets 25 73
Change in construction accounts payable (3,459) 1,417
Acquisition of property and equipment (30,399) (35,872)
Net cash used in investing activities (33,833) (34,382)
Cash flows from financing activities:    
Payroll taxes from net exercise of stock options (2,303) (2,013)
Proceeds from exercise of stock options 6,259 4,777
Line-of-credit borrowings   45,500
Line-of-credit payments   (44,000)
Payment of dividends (16,536) (16,742)
Purchase of company common stock (31,320) (60,031)
Net cash used in financing activities (43,900) (72,509)
Change in cash and cash equivalents 48,879 (3,981)
Cash and cash equivalents at beginning of period 58,760 43,361
Cash and cash equivalents at end of period 107,639 39,380
Supplemental disclosure of cash flow information:    
Cash paid for interest 186 583
Cash paid for income taxes $ 19,650 $ 18,740