Intangible Asset and Goodwill (Details 3) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2019		Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018	Dec. 31, 2018
Components of intangible assets
Accumulated Amortization	$ (243,120)	[1],[2]		$ (243,120)	[1],[2]		$ (268,534)
Finite-Lived Intangible Assets	33,762			33,762
Indefinite-lived Intangible Assets (Excluding Goodwill)	1,600			1,600
Intangible Assets, Gross (Excluding Goodwill)	278,482	[2]		278,482	[2]		328,470
Amortization expense for intangible assets	3,200		$ 5,100	13,096		$ 24,352
Intangible assets, net	35,362			35,362			59,936
Existing technology
Components of intangible assets
Gross Carrying Amount	241,189	[2]		241,189	[2]		258,903
Accumulated Amortization	(209,692)	[1],[2]		(209,692)	[1],[2]		(213,824)
Finite-Lived Intangible Assets	31,497			$ 31,497			$ 45,079
Existing technology | Minimum
Components of intangible assets
Useful Life (in years)				3 years			3 years
Existing technology | Maximum
Components of intangible assets
Useful Life (in years)				10 years			10 years
Customer contracts and contractual relationships
Components of intangible assets
Gross Carrying Amount	35,393	[2]		$ 35,393	[2]		$ 67,667
Accumulated Amortization	(33,128)	[1],[2]		(33,128)	[1],[2]		(54,410)
Finite-Lived Intangible Assets	2,265			$ 2,265			$ 13,257
Customer contracts and contractual relationships | Minimum
Components of intangible assets
Useful Life (in years)				6 months			1 year
Customer contracts and contractual relationships | Maximum
Components of intangible assets
Useful Life (in years)				10 years			10 years
Non-compete agreements
Components of intangible assets
Useful Life (in years)				3 years			3 years
Gross Carrying Amount	300	[2]		$ 300	[2]		$ 300
Accumulated Amortization	(300)	[1],[2]		(300)	[1],[2]		(300)
Finite-Lived Intangible Assets	0			0			0
In Process Research and Development [Member]
Components of intangible assets
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 1,600	[2]		$ 1,600	[2]		$ 1,600

[1] During the three months ended September 30, 2019, the Company acquired Northwest Logic which resulted in the Company recognizing additional intangible assets. Refer to Note 18, “Acquisition,” for additional information.

[2] (1) As of September 30, 2019, the Company had reclassified approximately $19.3 million of net intangible assets to assets held for sale. Refer to Note 16, “Assets and Liabilities Held for Sale,” for additional information.