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Restructuring and Integration Expenses - Schedule of Restructuring Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and integration expenses | $ 0 | $ 8,348 | $ 0 | $ 36,251 |
Cumulative | 198,912 |  | 198,912 |  | $ 198,900
Severance costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and integration expenses | 0 | 1,827 | 0 | 7,236 |
Cumulative | 58,126 |  | 58,126 |  |
Facility exit costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and integration expenses | 0 | 867 | 0 | 4,154 |
Cumulative | 27,368 |  | 27,368 |  |
System consolidation costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and integration expenses | 0 | 2,903 | 0 | 9,305 |
Cumulative | 37,389 |  | 37,389 |  |
Legal costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and integration expenses | 0 | 955 | 0 | 5,188 |
Cumulative | 13,926 |  | 13,926 |  |
Tax and accounting advisory services |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and integration expenses | 0 | 581 | 0 | 1,527 |
Cumulative | 27,358 |  | 27,358 |  |
Other costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and integration expenses | 0 | $ 1,215 | 0 | $ 8,841 |
Cumulative | $ 34,745 |  | $ 34,745 |  |

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