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Segments and Related Information - Reconciliation of Consolidated Income before Income Taxes to EBITDA (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
EBITDA Reconciliation: |  |  |  |
Income before income taxes | $ 140,035 | $ 157,405 | $ 338,290 | $ 271,455
Interest expense, net | 13,091 | 13,553 | 39,379 | 45,365
Depreciation | 95,366 | 71,397 | 262,132 | 182,173
Amortization of intangible assets | 23,352 | 11,200 | 54,522 | 28,384
EBITDA | $ 271,800 | $ 253,600 | $ 694,300 | $ 527,400

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