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Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Intangible assets    
Total Gross Intangible Assets $ 508,969 $ 508,969
Accumulated Amortization and Impairment 458,953 447,451
Total Net Intangible Assets 50,016 61,518
Technology    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 327,908 327,908
Accumulated Amortization and Impairment, Definite-lived intangible assets 299,710 291,766
Net Amount, Definite-lived intangible assets 28,198 36,142
Customer relationships    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 146,465 146,465
Accumulated Amortization and Impairment, Definite-lived intangible assets 129,290 126,764
Net Amount, Definite-lived intangible assets 17,175 19,701
Trademarks and tradenames    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 30,910 30,910
Accumulated Amortization and Impairment, Definite-lived intangible assets 26,274 25,256
Net Amount, Definite-lived intangible assets 4,636 5,654
Other Intangible Assets    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 3,686 3,686
Accumulated Amortization and Impairment, Definite-lived intangible assets 3,679 3,665
Net Amount, Definite-lived intangible assets $ 7 $ 21