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BUSINESS COMBINATIONS (Tables)
 12 Months Ended
Dec. 31, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]  
Business Combination, Recognized Asset Acquired and Liability Assumed The following table summarizes the preliminary and final determination and recognition of assets acquired and liabilities assumed (in thousands):
At Acquisition Date As Reported December 31, 2024Measurement Period AdjustmentsFinal Allocation At Acquisition Date
Accounts receivable, including unbilled receivables$69,072 $(856)$68,216 
Inventories and supplies384 — 384 
Prepaid expenses and other current assets4,383 (123)4,260 
Property, plant and equipment47,125 385 47,510 
Permits and other intangibles130,500 — 130,500 
Operating lease right-of-use assets9,385 — 9,385 
Other long-term assets5,712 1,133 6,845 
Accounts payable
(30,602)— (30,602)
Accrued expenses and other current liabilities(16,005)(300)(16,305)
Current portion of operating lease liabilities(2,758)— (2,758)
Operating lease liabilities, less current portion(6,627)— (6,627)
Closure and post-closure liabilities(2,492)(385)(2,877)
Remedial liabilities
(2,435)— (2,435)
Other long-term liabilities(374)— (374)
Total identifiable net assets205,268 (146)205,122 
Goodwill186,911 146 187,057 
Total purchase price$392,179 $— $392,179 
The following table summarizes the preliminary and final determination and recognition of assets acquired and liabilities assumed (in thousands):
At Acquisition Date As Reported December 31, 2024Measurement Period AdjustmentsFinal Allocation At Acquisition Date
Accounts receivable, including unbilled receivables$5,855 $(8)$5,847 
Inventories and supplies6,598 — 6,598 
Prepaid expenses and other current assets408 — 408 
Property, plant and equipment55,615 35 55,650 
Permits and other intangibles14,500 — 14,500 
Operating lease right-of-use assets3,615 — 3,615 
Other long-term assets92 — 92 
Accounts payable
(7,752)— (7,752)
Accrued expenses and other current liabilities(1,145)17 (1,128)
Current portion of operating lease liabilities(1,823)— (1,823)
Operating lease liabilities, less current portion(1,792)— (1,792)
Closure and post-closure liabilities(8,929)(35)(8,964)
Remedial liabilities
(2,757)90 (2,667)
Total identifiable net assets62,485 99 62,584 
Goodwill6,257 (99)6,158 
Total purchase price$68,742 $— $68,742 
The following table summarizes the final determination and recognition of assets acquired and liabilities assumed (in thousands):
Final Allocation
Accounts receivable, including unbilled receivables$25,160 
Inventories and supplies228 
Prepaid expenses and other current assets1,302 
Property, plant and equipment26,719 
Permits and other intangibles28,900 
Operating lease right-of-use assets4,716 
Other long-term assets72 
Accounts payable(7,240)
Accrued expenses and other current liabilities(3,290)
Current portion of operating lease liabilities(1,653)
Operating lease liabilities, less current portion(3,063)
Other long-term liabilities(560)
Total identifiable net assets71,291 
Goodwill39,564 
Total purchase price$110,855