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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 |

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