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Supplemental Financial Information - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Restructuring charges |  | $ 948 | $ 2,532 | $ 2,760
Fixed assets impairment charges |  | 1,537 | 1,506 | 0
Impairment charges |  | 1,537 | 1,506 | 807
Lease income |  | (989) | (948) | 0
Depreciation on leased assets |  | 1,907 | 3,512 | 0
Indemnity claim settlements from acquisitions |  | (715) | (700) | 0
Gain from antitrust litigation settlement |  | 0 | (4,231) | 0
Economic incentive grants |  | 0 | (556) | 0
Gain on sale of property, plant and equipment |  | 756 | (164) | (5,329)
Brightvolt, Inc. |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Impairment charges |  |  |  | 300
ROLINX |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Impairment charges | $ 500 |  |  |
Facility Closing |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Restructuring charges |  | 948 | 1,982 | 0
Global Headquarters Move |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Restructuring charges |  | $ 0 | $ 550 | $ 2,760

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