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Segment Information - Reconciliation of Segment Income to Income before Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting [Abstract] |  |  |  |
Segment income | $ 152,954 | $ 131,234 | $ 279,503 | $ 233,375
Interest and other debt expense | 26,406 | 25,837 | 53,712 | 50,807
Income before income taxes | $ 126,548 | $ 105,397 | $ 225,791 | $ 182,568

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