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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:      
Net income $ 390,974 $ 402,299 $ 377,856
Adjustments to reconcile net income to net cash from operating activities:      
Depreciation and amortization 446,006 400,922 365,761
Allowance for doubtful accounts 8,079 8,129 5,956
Amortization of deferred financing costs and debt discount 6,317 6,321 5,309
Accretion of environmental liabilities 14,326 13,456 13,667
Changes in environmental liability estimates (10,108) 4,139 4,828
Deferred income taxes 25,763 18,437 12,685
Other (income) expense, net (5,200) 1,454 (2,315)
Stock-based compensation 32,702 27,981 20,703
Loss on early extinguishment of debt 8,277 371 2,880
Gain on sale of businesses (776) 0 0
Environmental expenditures (16,099) (27,522) (28,960)
Changes in assets and liabilities, net of acquisitions:      
Accounts receivable and unbilled accounts receivable (31,849) (28,822) 2,453
Inventories and supplies 12,461 (49,588) (4,312)
Other current and non-current assets (42,372) (57,220) (22,645)
Accounts payable 23,382 12,327 (27,425)
Other current and long-term liabilities 4,842 45,087 8,111
Net cash from operating activities 866,725 777,771 734,552
Cash flows used in investing activities:      
Additions to property, plant and equipment (424,918) (432,241) (422,300)
Proceeds from sale and disposal of fixed assets 21,568 9,099 9,650
Acquisitions, net of cash acquired 0 (478,011) (119,596)
Proceeds from sale of businesses, net of transaction costs 4,275 750 750
Additions to intangible assets including costs to obtain or renew permits (3,648) (9,607) (2,649)
Purchases of available-for-sale securities (116,681) (117,861) (158,264)
Proceeds from sale of available-for-sale securities 93,618 124,197 117,359
Net cash used in investing activities (425,786) (903,674) (575,050)
Cash flows (used in) from financing activities:      
Change in uncashed checks 3,563 (1,473) 2,759
Tax payments related to withholdings on vested restricted stock (15,834) (13,759) (13,838)
Repurchases of common stock (250,002) (55,178) (51,164)
Deferred financing costs paid (16,216) (8,954) (6,736)
Payments on finance leases (33,113) (30,886) (15,937)
Proceeds from employee stock purchase plan 7,158 3,009 0
Principal payments on debt (2,009,898) (15,102) (623,975)
Proceeds from issuance of debt, net of discount 2,005,000 499,375 500,000
Borrowing from revolving credit facility 0 0 114,000
Payment on revolving credit facility 0 0 (114,000)
Net cash (used in) from financing activities (309,342) 377,032 (208,891)
Effect of exchange rate change on cash 7,526 (8,635) 1,484
Increase (decrease) in cash and cash equivalents 139,123 242,494 (47,905)
Cash and cash equivalents, beginning of year 687,192 444,698 492,603
Cash and cash equivalents, end of year 826,315 687,192 444,698
Cash payments for interest and income taxes:      
Interest paid 157,263 153,059 114,560
Income taxes paid, net of refunds 117,904 130,606 132,314
Non-cash investing activities:      
Property, plant and equipment accrued $ 33,332 $ 43,750 $ 52,376