CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 687,192	$ 444,698
Short-term marketable securities	102,634	106,101
Accounts receivable, net of allowances aggregating $47,242 and $42,209, respectively	1,015,357	983,111
Unbilled accounts receivable	162,215	107,859
Inventories and supplies	384,657	327,511
Prepaid expenses and other current assets	81,741	82,939
Total current assets	2,433,796	2,052,219
Property, plant and equipment, net	2,447,941	2,193,318
Other assets:
Operating lease right-of-use assets	250,853	187,060
Goodwill	1,477,199	1,287,736
Permits and other intangibles, net	701,987	602,797
Other long-term assets	65,502	59,739
Total other assets	2,495,541	2,137,332
Total assets	7,377,278	6,382,869
Current liabilities:
Current portion of long-term debt	15,102	10,000
Accounts payable	487,286	451,806
Deferred revenue	88,545	95,230
Accrued expenses and other current liabilities	419,445	397,157
Current portion of closure, post-closure and remedial liabilities	20,625	26,914
Current portion of operating lease liabilities	71,663	56,430
Total current liabilities	1,102,666	1,037,537
Other liabilities:
Closure and post-closure liabilities, less current portion of $10,304 and $13,556, respectively	119,484	105,044
Remedial liabilities, less current portion of $10,321 and $13,358, respectively	101,424	97,885
Long-term debt, less current portion	2,771,117	2,291,717
Operating lease liabilities, less current portion	182,883	131,743
Deferred tax liabilities	363,623	353,107
Other long-term liabilities	162,552	118,330
Total other liabilities	3,701,083	3,097,826
Commitments and contingent liabilities (See Note 18)
Stockholders' equity:
Authorized 80,000,000 shares; issued and outstanding 53,832,692 and 53,929,703 shares, respectively	538	539
Additional paid-in capital	421,749	459,728
Accumulated other comprehensive loss	(213,635)	(175,339)
Retained earnings	2,364,877	1,962,578
Total stockholders' equity	2,573,529	2,247,506
Total liabilities and stockholders' equity	$ 7,377,278	$ 6,382,869