Restructuring - Summary of Accruals of Restructuring Programs (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
| Restructuring Cost and Reserve [Line Items] | ||||
| Restructuring Expenses, Net | $ 537 | $ 845 | $ 561 | $ 14,617 |
| Contractual Lease Obligations | ||||
| Restructuring Cost and Reserve [Line Items] | ||||
| Restructuring Expenses, Net | 586 | 694 | 1,512 | 12,011 |
| Restructuring Reserve [Roll Forward] | ||||
| Balance at January 1, 2018 | 12,437 | |||
| Charges | 0 | |||
| Adjustments | 1,512 | |||
| Restructuring Charges | 1,512 | |||
| Payments | (4,559) | |||
| Balance at September 30, 2018 | 9,390 | 9,390 | ||
| Severance | ||||
| Restructuring Cost and Reserve [Line Items] | ||||
| Restructuring Expenses, Net | 0 | $ (285) | 601 | 1,306 |
| Restructuring Reserve [Roll Forward] | ||||
| Balance at January 1, 2018 | 2,303 | |||
| Charges | 601 | |||
| Adjustments | 0 | |||
| Restructuring Charges | 601 | |||
| Payments | (1,895) | |||
| Balance at September 30, 2018 | $ 1,009 | $ 1,009 | ||
| DAMI | Restructuring Program 2016 | ||||
| Restructuring Cost and Reserve [Line Items] | ||||
| Restructuring Expenses, Net | $ 300 | |||