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Intangible Asset and Goodwill (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Components of intangible assets
Accumulated Amortization	$ (258,802)		$ (258,802)		$ (240,480)
Finite-Lived Intangible Assets	69,340		69,340
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,600		1,600
Intangible Assets, Gross (Excluding Goodwill)	329,742		329,742		332,202
Amortization expense for intangible assets	8,700	$ 10,500	19,269	$ 20,938
Intangible Assets, Net	70,940		70,940		91,722
Existing technology
Components of intangible assets
Gross Carrying Amount	259,465		259,465		258,008
Accumulated Amortization	(206,160)		(206,160)		(191,554)
Finite-Lived Intangible Assets	53,305		$ 53,305		$ 66,454
Existing technology | Minimum [Member]
Components of intangible assets
Useful Life (in years)			3 years		3 years
Existing technology | Maximum [Member]
Components of intangible assets
Useful Life (in years)			10 years		10 years
Customer Contracts [Member]
Components of intangible assets
Gross Carrying Amount	68,377		$ 68,377		$ 68,794
Accumulated Amortization	(52,342)		(52,342)		(48,626)
Finite-Lived Intangible Assets	16,035		$ 16,035		$ 20,168
Customer Contracts [Member] | Minimum [Member]
Components of intangible assets
Useful Life (in years)			1 year		1 year
Customer Contracts [Member] | Maximum [Member]
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		$ 300		$ 300
Accumulated Amortization	(300)		(300)		(300)
Finite-Lived Intangible Assets	0		0		0
Favorable contracts
Components of intangible assets
Finite-Lived Intangible Assets	1,000		1,000		1,700
Cash received related to favorable contracts	300	$ 1,200	1,000	$ 2,400
In Process Research and Development [Member]
Components of intangible assets
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 1,600		$ 1,600		$ 5,100

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-Publisher FASB
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