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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 759,197 $ 687,192
Short-term marketable securities 91,176 102,634
Accounts receivable, net of allowances aggregating $43,778 and $47,242, respectively 1,104,805 1,015,357
Unbilled accounts receivable 182,059 162,215
Inventories and supplies 377,308 384,657
Prepaid expenses and other current assets 93,716 81,741
Total current assets 2,608,261 2,433,796
Property, plant and equipment, net 2,497,600 2,447,941
Other assets:    
Operating lease right-of-use assets 241,048 250,853
Goodwill 1,478,831 1,477,199
Permits and other intangibles, net 663,965 701,987
Other long-term assets 50,594 65,502
Total other assets 2,434,438 2,495,541
Total assets 7,540,299 7,377,278
Current liabilities:    
Current portion of long-term debt 15,102 15,102
Accounts payable 444,119 487,286
Deferred revenue 91,966 88,545
Accrued expenses and other current liabilities 415,170 419,445
Current portion of closure, post-closure and remedial liabilities 28,814 20,625
Current portion of operating lease liabilities 72,241 71,663
Total current liabilities 1,067,412 1,102,666
Other liabilities:    
Closure and post-closure liabilities, less current portion of $16,796 and $10,304, respectively 122,546 119,484
Remedial liabilities, less current portion of $12,018 and $10,321, respectively 85,299 101,424
Long-term debt, less current portion 2,764,231 2,771,117
Operating lease liabilities, less current portion 173,137 182,883
Deferred tax liabilities 358,597 363,623
Other long-term liabilities 193,237 162,552
Total other liabilities 3,697,047 3,701,083
Commitments and contingent liabilities (See Note 15)
Stockholders’ equity:    
Common stock, $0 par value: Authorized 80,000,000 shares; issued and outstanding 53,430,975 and 53,832,692 shares, respectively 534 538
Additional paid-in capital 317,145 421,749
Accumulated other comprehensive loss (211,100) (213,635)
Retained earnings 2,669,261 2,364,877
Total stockholders’ equity 2,775,840 2,573,529
Total liabilities and stockholders’ equity $ 7,540,299 $ 7,377,278