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Acquisitions and Divestitures - Merger and Integration Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | $ 8,647 | $ 43,116 | $ 14,307 | $ 74,490
Professional fees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 4,478 | 8,991 | 6,345 | 14,624
Employee compensation, incentives and benefits |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 1,472 | 3,849 | 2,989 | 9,086
Contract employment and outsourcing |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 17 | 1,703 | 17 | 3,102
Occupancy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 1,505 | 2,229 | 1,623 | 2,259
Miscellaneous expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 79 | 3,099 | 1,148 | 5,133
All other expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | $ 1,096 | $ 23,245 | $ 2,185 | $ 40,286

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- Definition Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs. + References No definition available. + Details
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