Restructuring - Summary of Restructuring Charges (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
| Restructuring Cost and Reserve [Line Items] | ||
| Total Restructuring Expenses | $ 13,281 | $ 906 |
| Right-of-Use Asset Impairment and Operating Lease Charges | ||
| Restructuring Cost and Reserve [Line Items] | ||
| Total Restructuring Expenses | 9,522 | 719 |
| Fixed Asset Impairment | ||
| Restructuring Cost and Reserve [Line Items] | ||
| Total Restructuring Expenses | 1,497 | 0 |
| Severance | ||
| Restructuring Cost and Reserve [Line Items] | ||
| Total Restructuring Expenses | 1,136 | 514 |
| Other Expenses | ||
| Restructuring Cost and Reserve [Line Items] | ||
| Total Restructuring Expenses | 1,126 | 0 |
| Other Expenses | ||
| Restructuring Cost and Reserve [Line Items] | ||
| Total Restructuring Expenses | $ 0 | $ (327) |