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Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Intangible assets    
Total Gross Intangible Assets $ 508,969 $ 508,969
Accumulated Amortization and Impairment 466,138 462,784
Total Net Intangible Assets 42,831 46,185
Technology    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 327,908 327,908
Accumulated Amortization and Impairment, Definite-lived intangible assets 304,661 302,358
Total definite-lived intangible assets 23,247 25,550
Customer relationships    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 146,465 146,465
Accumulated Amortization and Impairment, Definite-lived intangible assets 130,842 130,131
Total definite-lived intangible assets 15,623 16,334
Trademarks and tradenames    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 30,910 30,910
Accumulated Amortization and Impairment, Definite-lived intangible assets 26,953 26,614
Total definite-lived intangible assets 3,957 4,296
Other    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 3,686 3,686
Accumulated Amortization and Impairment, Definite-lived intangible assets 3,682 3,681
Total definite-lived intangible assets $ 4 $ 5