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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 254,288 | $ 252,628
Intangible assets with finite lives: Accumulated Amortization | (186,013) | (201,375)
Intangible assets with finite lives: Net | $ 68,275 | 51,253
Weighted average useful life remaining (in years) | 5 years |
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 103,332 | 102,023
Intangible assets with finite lives: Accumulated Amortization | (67,129) | (74,349)
Intangible assets with finite lives: Net | $ 36,203 | 27,674
Weighted average useful life remaining (in years) | 5 years |
Acquired technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 52,691 | 54,067
Intangible assets with finite lives: Accumulated Amortization | (47,546) | (51,241)
Intangible assets with finite lives: Net | $ 5,145 | 2,826
Weighted average useful life remaining (in years) | 2 years |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 25,096 | 23,668
Intangible assets with finite lives: Accumulated Amortization | (17,669) | (18,402)
Intangible assets with finite lives: Net | $ 7,427 | 5,266
Weighted average useful life remaining (in years) | 5 years |
Patent costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 11,032 | 11,678
Intangible assets with finite lives: Accumulated Amortization | (8,382) | (9,079)
Intangible assets with finite lives: Net | $ 2,650 | 2,599
Weighted average useful life remaining (in years) | 14 years |
Trade secrets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 19,374 | 19,296
Intangible assets with finite lives: Accumulated Amortization | (13,574) | (15,076)
Intangible assets with finite lives: Net | $ 5,800 | 4,220
Weighted average useful life remaining (in years) | 3 years |
Acquired patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 16,212 | 16,184
Intangible assets with finite lives: Accumulated Amortization | (13,160) | (14,340)
Intangible assets with finite lives: Net | $ 3,052 | 1,844
Weighted average useful life remaining (in years) | 7 years |
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 26,551 | 25,712
Intangible assets with finite lives: Accumulated Amortization | (18,553) | (18,888)
Intangible assets with finite lives: Net | $ 7,998 | $ 6,824
Weighted average useful life remaining (in years) | 1 year |

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