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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net income $ 140,141 $ 124,059
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 40,145 34,708
Amortization of deferred financing fees 531 536
Non-cash leasing arrangement 385 481
Impairment of long-lived assets 1,849 0
Deferred income taxes 552 47
Provision for doubtful accounts 718 2,250
Stock-based compensation 17,222 15,454
Cash received from insurance proceeds 199 750
Loss (Gain) on insurance claims and asset disposals 254 (749)
Litigation adjustment (3,734) (818)
Change in operating assets and liabilities    
Accounts receivable (62,813) (39,433)
Prepaid income taxes (14,968) 4,186
Prepaid expenses and other assets (15,538) (516)
Cash surrender value of life insurance policy premiums (10,725) (12,132)
Deferred compensation liability 10,707 12,170
Operating lease obligations 400 (6,411)
Accounts payable (5,559) 1,020
Accrued wages and related liabilities (8,343) (991)
Income taxes payable 0 25,240
Other accrued liabilities 650 (578)
Accrued self-insurance liabilities 19,568 8,832
Other long-term liabilities 608 (23)
NET CASH PROVIDED BY OPERATING ACTIVITIES 112,249 168,082
Cash flows from investing activities:    
Purchase of property and equipment (64,635) (51,614)
Cash payments for business acquisitions (494) 0
Cash payments for asset acquisitions (64,896) (399)
Escrow deposits (646) (1,202)
Cash from insurance proceeds 961 913
Cash proceeds from the sale of assets 1,988 18
Purchases of investments (35,508) (18,425)
Maturities of investments 19,267 7,862
Other restricted assets (601) 412
NET CASH USED IN INVESTING ACTIVITIES (144,564) (62,435)
Cash flows from financing activities:    
Payments on debt (1,958) (1,958)
Issuance of common stock upon exercise of options 10,319 8,559
Repurchase of shares of common stock to satisfy tax withholding obligations (1,209) (1,929)
Dividends paid (6,810) (6,415)
Non-controlling interest distribution (278) (4)
Purchase of non-controlling interest (39) (177)
Payments of deferred financing costs 0 (19)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 25 (1,943)
Net (decrease) increase in cash and cash equivalents (32,290) 103,704
Cash and cash equivalents beginning of period 509,626 316,270
Cash and cash equivalents end of period 477,336 419,974
Cash paid during the period for:    
Interest 3,488 3,534
Income taxes 56,062 6,030
Lease liabilities 104,749 95,938
Non-cash financing and investing activity    
Accrued capital expenditures 6,000 5,000
Accrued dividends declared 3,424 3,231
Right-of-use assets obtained in exchange for new and modified operating lease obligations $ 124,133 $ 352,131