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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 255,832 | $ 255,671
Intangible assets with finite lives: Accumulated Amortization | (215,563) | (207,333)
Intangible assets with finite lives: Net | $ 40,269 | 48,338
Weighted average useful life remaining (in years) | 5 years |
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 103,947 | 103,661
Intangible assets with finite lives: Accumulated Amortization | (82,087) | (77,021)
Intangible assets with finite lives: Net | $ 21,860 | 26,640
Weighted average useful life remaining (in years) | 4 years |
Acquired technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 54,318 | 54,378
Intangible assets with finite lives: Accumulated Amortization | (52,541) | (51,875)
Intangible assets with finite lives: Net | $ 1,777 | 2,503
Weighted average useful life remaining (in years) | 1 year |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 23,528 | 23,907
Intangible assets with finite lives: Accumulated Amortization | (19,610) | (19,133)
Intangible assets with finite lives: Net | $ 3,918 | 4,774
Weighted average useful life remaining (in years) | 4 years |
Patent costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 18,836 | 11,760
Intangible assets with finite lives: Accumulated Amortization | (9,919) | (9,535)
Intangible assets with finite lives: Net | $ 8,917 | 2,225
Weighted average useful life remaining (in years) | 15 years |
Trade secrets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 19,629 | 19,494
Intangible assets with finite lives: Accumulated Amortization | (16,847) | (15,714)
Intangible assets with finite lives: Net | $ 2,782 | 3,780
Weighted average useful life remaining (in years) | 2 years |
Acquired patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 16,226 | 16,215
Intangible assets with finite lives: Accumulated Amortization | (15,219) | (14,706)
Intangible assets with finite lives: Net | $ 1,007 | 1,509
Weighted average useful life remaining (in years) | 7 years |
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 19,348 | 26,256
Intangible assets with finite lives: Accumulated Amortization | (19,340) | (19,349)
Intangible assets with finite lives: Net | $ 8 | $ 6,907
Weighted average useful life remaining (in years) | 1 year |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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