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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