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Supplemental Financial Information - Restructuring Charges (Details) - USD ($)
$ in Thousands
12 Months Ended
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
Other impairment charges 0 0 807
Total impairment charges 1,537 1,506 807
Total restructuring and impairment charges 2,485 4,038 3,567
Global Headquarters Move      
Condensed Financial Statements, Captions [Line Items]      
Restructuring charges 0 550 2,760
Facility Closing      
Condensed Financial Statements, Captions [Line Items]      
Restructuring charges $ 948 $ 1,982 $ 0