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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Provision for doubtful accounts $ 9,626 $ 14,808
Closure, post-closure and remedial liabilities 29,770 32,189
Operating lease liabilities 63,020 60,929
Accrued expenses 15,631 14,749
Accrued compensation and benefits 17,483 16,876
Net operating loss carryforwards 57,298 48,331
Excess business interest 13,116 22,078
Tax credit carryforwards 2,507 2,619
Stock-based compensation 5,822 4,877
Other 2,556 2,565
Total deferred tax assets 216,829 220,021
Deferred tax liabilities:    
Property, plant and equipment (316,192) (311,546)
Operating lease right-of-use assets (61,948) (59,999)
Interest rate swap asset (3,674) (8,748)
Permits and other intangible assets (165,672) (158,905)
Prepaid expenses (12,640) (10,881)
Total deferred tax liabilities (560,126) (550,079)
Total net deferred tax liability before valuation allowance (343,297) (330,058)
Less valuation allowance (34,418) (27,232)
Net deferred tax liabilities (377,715) $ (357,290)
State net operating loss carryforwards, begin to expire in 2025 290,400  
Federal operating loss carryforwards, begin to expire in 2025 75,700  
Foreign net operating loss carryforwards, begin to expire in 2025 $ 69,300