Intangible Assets and Goodwill (Details 3) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Components of intangible assets
Accumulated Amortization	$ (251,774)		$ (247,082)
Finite-Lived Intangible Assets	47,608
In-process research and development	2,600
Intangible Assets, Gross	301,982		301,982
Intangible Assets, Net	50,208		54,900
Amortization expense for intangible assets	4,692	$ 4,988
In-process research and development
Components of intangible assets
In-process research and development	2,600		2,600
Existing technology
Components of intangible assets
Gross Carrying Amount	262,789		262,789
Accumulated Amortization	(217,767)		(213,354)
Finite-Lived Intangible Assets	45,022		49,435
Customer contracts and contractual relationships
Components of intangible assets
Gross Carrying Amount	36,293		36,293
Accumulated Amortization	(33,707)		(33,428)
Finite-Lived Intangible Assets	$ 2,586		$ 2,865
Non-compete agreements and trademarks
Components of intangible assets
Useful Life (in years)	3 years		3 years
Gross Carrying Amount	$ 300		$ 300
Accumulated Amortization	(300)		(300)
Finite-Lived Intangible Assets	$ 0		$ 0
Minimum \| Existing technology
Components of intangible assets
Useful Life (in years)	3 years		3 years
Minimum \| Customer contracts and contractual relationships
Components of intangible assets
Useful Life (in years)	6 months		6 months
Maximum \| Existing technology
Components of intangible assets
Useful Life (in years)	10 years		10 years
Maximum \| Customer contracts and contractual relationships
Components of intangible assets
Useful Life (in years)	10 years		10 years

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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