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Acquisitions and Divestitures - Merger and Integration Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition [Line Items] |  |
Merger and integration expense | $ 5,660 | $ 31,374
Professional fees |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 1,867 | 5,633
Employee compensation, incentives and benefits |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 1,517 | 5,237
Contract employment and outsourcing |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 0 | 1,399
Miscellaneous expense |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 1,187 | 2,064
All other expense |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | $ 1,089 | $ 17,041

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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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