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Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Intangible assets    
Total Gross Intangible Assets $ 550,119 $ 550,119
Accumulated Amortization and Impairment 473,430 464,970
Total Net Intangible Assets 76,689 85,149
In-process R&D    
Intangible assets    
Gross Carrying Amount, Indefinite-lived intangible assets   13,710
Accumulated Amortization and Impairment, Indefinite-lived intangible assets   10,530
Net Amount, Indefinite-lived intangible assets   3,180
Technology    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 350,928 337,218
Accumulated Amortization and Impairment, Definite-lived intangible assets 306,817 290,808
Net Amount, Definite-lived intangible assets 44,111 46,410
Customer relationships    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 164,595 164,595
Accumulated Amortization and Impairment, Definite-lived intangible assets 138,387 136,126
Net Amount, Definite-lived intangible assets 26,208 28,469
Trademarks and tradenames    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 30,910 30,910
Accumulated Amortization and Impairment, Definite-lived intangible assets 24,577 23,899
Net Amount, Definite-lived intangible assets 6,333 7,011
Other Intangible Assets    
Intangible assets    
Gross Carrying Amount, Definite-lived intangible assets 3,686 3,686
Accumulated Amortization and Impairment, Definite-lived intangible assets 3,649 3,607
Net Amount, Definite-lived intangible assets $ 37 $ 79