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Segment Information - Reconciliation of gross margin to income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Reconciliation of total gross margin to income |  |
Total gross margin | $ 155,745 | $ 116,444
Less: |  |
Selling, general and administrative | 31,665 | 26,425
Depreciation and amortization | 42,835 | 40,181
Long-lived and other asset impairment | 2,568 | 2,569
Restructuring charges |  | 1,047
Interest expense | 27,334 | 26,581
Gain on sale of assets, net | (2,381) | (3,605)
Other (income) expense, net | 139 | 603
Income before income taxes | $ 53,585 | $ 22,643

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