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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Cash flows from operating activities:    
Net income $ 303,974 $ 248,730
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 92,853 76,606
Amortization of deferred financing fees 917 793
Stock-based compensation 49,105 35,375
Insurance proceeds, loss (gain) on long-lived assets and other investments 1,911 (1,003)
Other operating activities, net 3,743 12,297
Change in operating assets and liabilities    
Accounts receivable (29,305) (44,356)
Prepaid income taxes (28,189) (19,507)
Prepaid expenses and other assets (4,735) (7,716)
Cash surrender value of life insurance policy premiums (16,755) (16,332)
Deferred compensation liability 16,720 16,332
Operating lease obligations (10) (3,265)
Accounts payable 25,776 5,449
Accrued wages and related liabilities 15,823 27,549
Other accrued liabilities 11,602 27,081
Accrued self-insurance liabilities 68,918 22,917
NET CASH PROVIDED BY OPERATING ACTIVITIES 512,348 380,950
Cash flows from investing activities:    
Purchase of property and equipment (135,915) (143,714)
Cash payments for acquisitions (539,940) (240,300)
Cash proceeds from insurance recoveries and sale of assets 6,704 3,691
Purchases of investments (82,835) (91,791)
Maturities of investments 60,847 82,278
Other investing activities 202 599
NET CASH USED IN INVESTING ACTIVITIES (690,937) (389,237)
Cash flows from financing activities:    
Proceeds from debt (Note 13) 60,000 0
Payments on debt (3,155) (3,050)
Issuance of common stock upon exercise of options 21,797 22,726
Repurchase of shares of common stock to satisfy tax withholding obligations (980) (1,071)
Repurchase of shares of common stock (Note 19) (47,430) (20,000)
Dividends paid (11,360) (10,791)
Payments of deferred financing costs (6,503) 0
Other financing activities (69) (457)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 12,300 (12,643)
Net decrease in cash and cash equivalents (166,289) (20,930)
Cash and cash equivalents beginning of period 503,881 464,598
Cash and cash equivalents end of period 337,592 443,668
Cash paid during the period for:    
Interest 5,001 5,220
Income taxes 127,389 86,181
Lease liabilities 200,468 178,699
Non-cash financing and investing activity    
Accrued capital expenditures 11,370 9,300
Accrued dividends declared 3,792 3,619
Right-of-use assets obtained in exchange for new and modified operating lease obligations $ 121,367 $ 258,486