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Restructuring - Related Balance Sheet Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve - Beginning Balance | $ 40,125 |  |
Costs charged to expense | 77,183 | $ 6,418 | $ 49,090
Cash (payments) receipts | (34,462) |  |
Net assets disposed and impaired | 901 |  |
Effect of change in exchange rates | (6,377) |  |
Restructuring Reserve - Ending Balance | 75,568 | 40,125 |
Employee severance costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve - Beginning Balance | 37,654 |  |
Costs charged to expense | 69,768 |  |
Cash (payments) receipts | (28,894) |  |
Net assets disposed and impaired | 0 |  |
Effect of change in exchange rates | (6,376) |  |
Restructuring Reserve - Ending Balance | 72,152 | 37,654 |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve - Beginning Balance | 0 |  |
Costs charged to expense | 859 |  |
Cash (payments) receipts | 42 |  |
Net assets disposed and impaired | 901 |  |
Effect of change in exchange rates | 0 |  |
Restructuring Reserve - Ending Balance | 0 | 0 |
Other restructuring costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve - Beginning Balance | 2,471 |  |
Costs charged to expense | 6,556 |  |
Cash (payments) receipts | (5,610) |  |
Net assets disposed and impaired | 0 |  |
Effect of change in exchange rates | (1) |  |
Restructuring Reserve - Ending Balance | $ 3,416 | $ 2,471 |

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