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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 251,363 | $ 260,047
Intangible assets with finite lives: Accumulated Amortization | (176,904) | (161,264)
Intangible assets with finite lives: Net | $ 74,459 | 98,783
Weighted average useful life remaining (in years) | 6 years |
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 103,833 | 105,505
Intangible assets with finite lives: Accumulated Amortization | (64,853) | (57,796)
Intangible assets with finite lives: Net | $ 38,980 | 47,709
Weighted average useful life remaining (in years) | 6 years |
Acquired technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 49,032 | 54,716
Intangible assets with finite lives: Accumulated Amortization | (42,677) | (39,644)
Intangible assets with finite lives: Net | $ 6,355 | 15,072
Weighted average useful life remaining (in years) | 2 years |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 25,200 | 25,813
Intangible assets with finite lives: Accumulated Amortization | (17,111) | (15,552)
Intangible assets with finite lives: Net | $ 8,089 | 10,261
Weighted average useful life remaining (in years) | 6 years |
Patent costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 18,061 | 17,909
Intangible assets with finite lives: Accumulated Amortization | (8,086) | (7,338)
Intangible assets with finite lives: Net | $ 9,975 | 10,571
Weighted average useful life remaining (in years) | 15 years |
Trade secrets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 19,393 | 19,431
Intangible assets with finite lives: Accumulated Amortization | (13,066) | (11,530)
Intangible assets with finite lives: Net | $ 6,327 | 7,901
Weighted average useful life remaining (in years) | 4 years |
Acquired patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 16,220 | 16,661
Intangible assets with finite lives: Accumulated Amortization | (12,761) | (11,969)
Intangible assets with finite lives: Net | $ 3,459 | 4,692
Weighted average useful life remaining (in years) | 8 years |
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 19,624 | 20,012
Intangible assets with finite lives: Accumulated Amortization | (18,350) | (17,435)
Intangible assets with finite lives: Net | $ 1,274 | $ 2,577
Weighted average useful life remaining (in years) | 2 years |

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