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Supplemental Financial Information (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |
Restructuring charges | $ 12,348 | $ 948 | $ 2,532
Impairment charges | 639 | 1,537 | 1,506
Lease income | 0 | 989 | 948
Depreciation on leased assets | 0 | 1,907 | 3,512
Indemnity claim settlements from acquisitions | 0 | 715 | 700
Gain from antitrust litigation settlement | 0 | 0 | 4,231
Economic incentive grants | 145 | 0 | 556
ACS |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Impairment charges | 600 | 1,500 | 1,500
Facility consolidation |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Restructuring charges | 0 | 948 | 1,982
Global headquarters relocation |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Restructuring charges | $ 0 | $ 0 | $ 550

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