Intangible Assets and Liabilities - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 979,814	$ 981,160	$ 769,851
Intangible assets, gross (excluding goodwill)	979,814	981,160
Accumulated amortization	(794,717)	(723,577)
Finite-lived intangible assets, Net	185,097	257,583
Intangible assets, net	185,097	257,583
Finite-lived intangible liabilities, gross	(23,900)	(23,900)	0
Finite-lived intangible liabilities, accumulated accretion	13,450	5,217
Finite-lived intangible liabilities, net	(10,450)	(18,683)
Amortization of intangible assets	64,286	71,713	$ 20,785
Core-developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	507,669	507,100
Accumulated amortization	(458,109)	(429,955)
Finite-lived intangible assets, Net	49,560	77,145
Customer contracts and relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	381,288	379,614
Accumulated amortization	(251,509)	(212,538)
Finite-lived intangible assets, Net	129,779	167,076
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	78,837	78,746
Accumulated amortization	(73,732)	(69,879)
Finite-lived intangible assets, Net	5,105	8,867
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	12,020	12,600
Accumulated amortization	(11,367)	(11,205)
Finite-lived intangible assets, Net	653	1,395
Finite-Lived Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	979,814	978,060
Accumulated amortization	(794,717)	(723,577)
Finite-lived intangible assets, Net	185,097	254,483
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	$ 0	$ 3,100