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Restructuring - Related Balance Sheet Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve - Beginning Balance | $ 75,568 |  |
Costs charged to expense | 6,278 | $ 77,183 | $ 6,418
Cash (payments) receipts | (20,715) |  |
Net assets disposed and impaired | 3,715 |  |
Effect of change in exchange rates | (1,309) |  |
Restructuring Reserve - Ending Balance | 56,107 | 75,568 |
Employee severance costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve - Beginning Balance | 72,152 |  |
Costs charged to expense | (608) |  |
Cash (payments) receipts | (16,482) |  |
Net assets disposed and impaired | 0 |  |
Effect of change in exchange rates | (1,321) |  |
Restructuring Reserve - Ending Balance | 53,741 | 72,152 |
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 | (1,785) |  |
Cash (payments) receipts | (5,500) |  |
Net assets disposed and impaired | 3,715 |  |
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 | 3,416 |  |
Costs charged to expense | 8,671 |  |
Cash (payments) receipts | (9,733) |  |
Net assets disposed and impaired | 0 |  |
Effect of change in exchange rates | 12 |  |
Restructuring Reserve - Ending Balance | $ 2,366 | $ 3,416 |

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