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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 826,315 $ 687,192
Short-term marketable securities 127,363 102,634
Accounts receivable, net of allowances aggregating $35,991 and $47,242, respectively 1,044,137 1,015,357
Unbilled accounts receivable 160,888 162,215
Inventories and supplies 372,088 384,657
Prepaid expenses and other current assets 116,452 81,741
Total current assets 2,647,243 2,433,796
Property, plant and equipment, net 2,541,067 2,447,941
Other assets:    
Operating lease right-of-use assets 255,084 250,853
Goodwill 1,479,050 1,477,199
Permits and other intangibles, net 653,027 701,987
Other long-term assets 48,585 65,502
Total other assets 2,435,746 2,495,541
Total assets 7,624,056 7,377,278
Current liabilities:    
Current portion of long-term debt 12,600 15,102
Accounts payable 506,592 487,286
Deferred revenue 81,529 88,545
Accrued expenses and other current liabilities 441,788 419,445
Current portion of closure, post-closure and remedial liabilities 19,112 20,625
Current portion of operating lease liabilities 75,226 71,663
Total current liabilities 1,136,847 1,102,666
Other liabilities:    
Closure and post-closure liabilities, less current portion of $10,290 and $10,304, respectively 125,038 119,484
Remedial liabilities, less current portion of $8,822 and $10,321, respectively 86,547 101,424
Long-term debt, less current portion 2,763,563 2,771,117
Operating lease liabilities, less current portion 184,308 182,883
Deferred tax liabilities 384,207 363,623
Other long-term liabilities 197,886 162,552
Total other liabilities 3,741,549 3,701,083
Commitments and contingent liabilities (See Note 17)
Stockholders' equity:    
Authorized 80,000,000 shares; issued and outstanding 52,870,599 and 53,832,692 shares, respectively 529 538
Additional paid-in capital 193,896 421,749
Accumulated other comprehensive loss (204,616) (213,635)
Retained earnings 2,755,851 2,364,877
Total stockholders' equity 2,745,660 2,573,529
Total liabilities and stockholders' equity $ 7,624,056 $ 7,377,278