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Restructuring and Impairment Activities (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | $ 1,600,000 | $ 400,000 | $ 2,000,000.0 | $ 1,400,000 |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at beginning of year |  |  | 1,400,000 | 1,700,000 | $ 1,700,000
Accruals for announced programs |  |  | 2,000,000.0 |  | 1,300,000
Cash payments |  |  | (2,700,000) |  | (3,300,000)
Other |  |  | 0 |  | 1,800,000
Exchange rate impacts |  |  | (100,000) |  | (100,000)
Balance at end of period | 600,000 |  | 600,000 |  | $ 1,400,000
AMS |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | 0.0 | 400,000 | 0.0 | 1,200,000 |
AMS | UNITED STATES | Asset Impairment Charge |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  |  | 300,000 |
AMS | UNITED STATES | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  |  | 900,000 |
EP |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | $ 1,600,000 | $ 0.0 | 2,000,000.0 | 200,000 |
EP | France and United States | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  |  | 200,000 |
EP | Philippines | Asset Impairment Charge |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | 0 | $ 0 |
EP | FRANCE | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | $ 2,000,000.0 |  |

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