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Segment Information - Reconciliation of Segment Income to Income before Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting [Abstract] |  |  |  |
Segment income | $ 167,917 | $ 174,033 | $ 447,420 | $ 407,408
Interest and other debt expense | 27,039 | 27,725 | 80,751 | 78,532
Income before income taxes | $ 140,878 | $ 146,308 | $ 366,669 | $ 328,876

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