Intangible Assets and Liabilities Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Intangible assets, Accumulated (Amortization) Accretion	$ (837,330)	$ (835,893)
Intangible assets, Net	85,514
Intangible assets, Gross	922,844	928,422	$ 983,633	$ 1,000,037
Intangible assets, Net	85,514	92,529
Intangible liabilities, Gross	(23,900)	(23,900)	$ (23,900)	$ (23,900)
Intangible liabilities, Accumulated (Amortization) Accretion	23,556	23,441
Intangible liabilities, Net	(344)	(459)
Core-developed technology [Member]
Intangible Assets [Line Items]
Intangible assets, Gross	503,866	505,429
Intangible assets, Accumulated (Amortization) Accretion	(491,687)	(491,047)
Intangible assets, Net	12,179	14,382
Customer contracts and relationships [Member]
Intangible Assets [Line Items]
Intangible assets, Gross	333,023	336,421
Intangible assets, Accumulated (Amortization) Accretion	(262,332)	(261,043)
Intangible assets, Net	70,691	75,378
Trademarks and trade names [Member]
Intangible Assets [Line Items]
Intangible assets, Gross	73,935	74,551
Intangible assets, Accumulated (Amortization) Accretion	(71,607)	(72,133)
Intangible assets, Net	2,328	2,418
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Intangible assets, Gross	12,020	12,021
Intangible assets, Accumulated (Amortization) Accretion	(11,704)	(11,670)
Intangible assets, Net	$ 316	$ 351