Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Intangible assets
Total Gross Intangible Assets	$ 508,969	$ 508,969
Accumulated Amortization and Impairment	469,114	462,784
Total Net Intangible Assets	39,855	46,185
Technology
Intangible assets
Gross Carrying Amount, Definite-lived intangible assets	327,908	327,908
Accumulated Amortization and Impairment, Definite-lived intangible assets	306,624	302,358
Total definite-lived intangible assets	21,284	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	131,552	130,131
Total definite-lived intangible assets	14,913	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	27,254	26,614
Total definite-lived intangible assets	3,656	4,296
Other
Intangible assets
Gross Carrying Amount, Definite-lived intangible assets	3,686	3,686
Accumulated Amortization and Impairment, Definite-lived intangible assets	3,684	3,681
Total definite-lived intangible assets	$ 2	$ 5