Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 254,621	$ 254,288
Intangible assets with finite lives: Accumulated Amortization	(192,121)	(186,013)
Intangible assets with finite lives: Net	$ 62,500	68,275
Weighted average useful life remaining (in years)	5 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 102,975	103,332
Intangible assets with finite lives: Accumulated Amortization	(69,717)	(67,129)
Intangible assets with finite lives: Net	$ 33,258	36,203
Weighted average useful life remaining (in years)	5 years
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 53,304	52,691
Intangible assets with finite lives: Accumulated Amortization	(48,947)	(47,546)
Intangible assets with finite lives: Net	$ 4,357	5,145
Weighted average useful life remaining (in years)	2 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 25,101	25,096
Intangible assets with finite lives: Accumulated Amortization	(18,316)	(17,669)
Intangible assets with finite lives: Net	$ 6,785	7,427
Weighted average useful life remaining (in years)	5 years
Patent costs
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 11,263	11,032
Intangible assets with finite lives: Accumulated Amortization	(8,705)	(8,382)
Intangible assets with finite lives: Net	$ 2,558	2,650
Weighted average useful life remaining (in years)	14 years
Trade secrets
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 19,295	19,374
Intangible assets with finite lives: Accumulated Amortization	(14,048)	(13,574)
Intangible assets with finite lives: Net	$ 5,247	5,800
Weighted average useful life remaining (in years)	3 years
Acquired patents
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 16,197	16,212
Intangible assets with finite lives: Accumulated Amortization	(13,552)	(13,160)
Intangible assets with finite lives: Net	$ 2,645	3,052
Weighted average useful life remaining (in years)	7 years
Other
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 26,486	26,551
Intangible assets with finite lives: Accumulated Amortization	(18,836)	(18,553)
Intangible assets with finite lives: Net	$ 7,650	$ 7,998
Weighted average useful life remaining (in years)	1 year

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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