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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Intangible assets      
Average Remaining Amortization Period   5 years 9 months 18 days  
Total definite-lived intangible assets   $ 46,185  
Total Gross Intangible Assets   508,969 $ 508,969
Accumulated Amortization and Impairment   462,784 447,451
Total Net Intangible Assets   $ 46,185 61,518
Impairment charges, definite-lived intangible assets $ 216,400    
In-process R&D      
Intangible assets      
Impairment charges, indefinite-lived intangible assets $ 35,900    
Technology      
Intangible assets      
Average Remaining Amortization Period   4 years 7 months 6 days  
Gross Carrying Amount, Definite-lived intangible assets   $ 327,908 327,908
Accumulated Amortization and Impairment, Definite-lived intangible assets   302,358 291,766
Total definite-lived intangible assets   $ 25,550 36,142
Customer relationships      
Intangible assets      
Average Remaining Amortization Period   8 years 2 months 12 days  
Gross Carrying Amount, Definite-lived intangible assets   $ 146,465 146,465
Accumulated Amortization and Impairment, Definite-lived intangible assets   130,131 126,764
Total definite-lived intangible assets   $ 16,334 19,701
Trademarks and tradenames      
Intangible assets      
Average Remaining Amortization Period   3 years 6 months  
Gross Carrying Amount, Definite-lived intangible assets   $ 30,910 30,910
Accumulated Amortization and Impairment, Definite-lived intangible assets   26,614 25,256
Total definite-lived intangible assets   $ 4,296 5,654
Other      
Intangible assets      
Average Remaining Amortization Period   9 months 18 days  
Gross Carrying Amount, Definite-lived intangible assets   $ 3,686 3,686
Accumulated Amortization and Impairment, Definite-lived intangible assets   3,681 3,665
Total definite-lived intangible assets   $ 5 $ 21