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Segment Reporting - Reconciliation of Net Income to Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting [Abstract] |  |
Net income | $ 56,747 | $ 62,645
Add back: |  |
Income tax provision | 16,465 | 19,930
Interest income and other | (5,017) | (159)
Interest expense | 4,861 | 4,746
Unallocated corporate expenses | 23,591 | 22,103
Segment depreciation expense | 7,146 | 6,364
Amortization of intangible assets | 2,331 | 1,861
Total Adjusted Segment EBITDA | $ 106,124 | $ 117,490

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