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Segment Reporting - Reconciliation of Net Income To Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 55,589,000 | $ 50,172,000 | $ 48,174,000 | $ 56,747,000 | $ 29,061,000 | $ 60,422,000 | $ 64,598,000 | $ 62,645,000 | $ 210,682,000 | $ 216,726,000 | $ 150,611,000
Income tax provision |  |  |  |  |  |  |  |  | 51,764,000 | 71,724,000 | 57,181,000
Interest income and other |  |  |  |  |  |  |  |  | 412,000 | (2,061,000) | (4,977,000)
Interest expense |  |  |  |  |  |  |  |  | 19,805,000 | 19,206,000 | 27,149,000
Gain on sale of business |  |  |  |  |  |  |  |  | 0 | 0 | (13,031,000)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | 0 | 9,072,000
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 423,624,000 | 439,514,000 | 358,741,000
Special charges |  |  |  |  |  |  |  |  | 7,103,000 | 0 | 0
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 210,682,000 | 216,726,000 | 150,611,000
Income tax provision |  |  |  |  |  |  |  |  | 51,764,000 | 71,724,000 | 57,181,000
Interest income and other |  |  |  |  |  |  |  |  | 412,000 | (2,061,000) | (4,977,000)
Interest expense |  |  |  |  |  |  |  |  | 19,805,000 | 19,206,000 | 27,149,000
Gain on sale of business |  |  |  |  |  |  |  |  | 0 | 0 | (13,031,000)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | 0 | 9,072,000
Unallocated corporate expenses (1) |  |  |  |  |  |  |  |  | 94,463,000 | 98,398,000 | 96,595,000
Segment depreciation expense |  |  |  |  |  |  |  |  | 29,381,000 | 27,369,000 | 27,979,000
Amortization of intangible assets |  |  |  |  |  |  |  |  | 10,387,000 | 8,152,000 | 8,162,000
Segment special charges |  |  |  |  |  |  |  |  | 6,730,000 | 0 | 0
Adjusted Segment EBITDA |  |  |  |  |  |  |  |  | 423,624,000 | $ 439,514,000 | $ 358,741,000
Special charges |  |  |  |  |  |  |  |  | $ 400,000 |  |

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- Definition Used as a reconciling item from Total Adjusted Segment EBITDA to Income before tax provision, the charge against earnings in the period, comprised of costs associated with non-recurring activities related to our global branding strategy and other strategic branding decisions, a realignment of our workforce and consolidation of office locations. + References No definition available. + Details
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