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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 248,730 $ 218,708
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 76,606 61,619
Amortization of deferred financing fees 793 796
Non-cash leasing arrangement 632 590
Impairment of long-lived assets 1,073 1,849
Deferred income taxes 10,156 1,931
Provision for doubtful accounts 1,509 1,419
Stock-based compensation 35,375 26,406
Cash received from insurance proceeds 3,877 199
(Gain) loss on insurance claims, other investments and asset disposals (5,953) 849
Change in operating assets and liabilities    
Accounts receivable (44,356) (69,025)
Prepaid income taxes (19,507) (22,130)
Prepaid expenses and other assets (7,716) (16,668)
Cash surrender value of life insurance policy premiums (16,332) (14,840)
Deferred compensation liability 16,332 14,941
Operating lease obligations (3,265) 331
Accounts payable 5,449 (5,237)
Accrued wages and related liabilities 27,549 25,303
Other accrued liabilities 27,081 2,308
Accrued self-insurance liabilities 22,917 17,381
NET CASH PROVIDED BY OPERATING ACTIVITIES 380,950 246,730
Cash flows from investing activities:    
Purchase of property and equipment (143,714) (110,079)
Cash payments for acquisitions (240,300) (83,384)
Escrow deposits 0 (3,846)
Cash from insurance proceeds 3,567 1,562
Cash proceeds from the sale of assets 124 2,808
Purchases of investments (91,791) (52,262)
Maturities of investments 82,278 22,553
Other restricted assets 599 (817)
NET CASH USED IN INVESTING ACTIVITIES (389,237) (223,465)
Cash flows from financing activities:    
Proceeds from debt (Note 14) 0 400
Payments on debt (3,050) (3,350)
Issuance of common stock upon exercise of options 22,726 18,296
Repurchase of shares of common stock to satisfy tax withholding obligations (1,071) (1,209)
Repurchase of shares of common stock (Note 20) (20,000) 0
Dividends paid (10,791) (10,234)
Non-controlling interest distribution 0 (278)
Purchase of non-controlling interest (457) (4,450)
NET CASH USED IN FINANCING ACTIVITIES (12,643) (825)
Net (decrease)/increase in cash and cash equivalents (20,930) 22,440
Cash and cash equivalents beginning of period 464,598 509,626
Cash and cash equivalents end of period 443,668 532,066
Cash paid during the period for:    
Interest 5,220 5,276
Income taxes 86,181 81,962
Lease liabilities 178,699 159,487
Non-cash financing and investing activity    
Accrued capital expenditures 9,300 7,300
Accrued dividends declared 3,619 3,437
Right-of-use assets obtained in exchange for new and modified operating lease obligations $ 258,486 $ 220,815