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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 254,288 | $ 260,047
Accumulated Amortization | (186,013) | (161,264)
Net | $ 68,275 | 98,783
Weighted Average Useful Life Remaining (in years) | 5 years |
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 103,332 | 105,505
Accumulated Amortization | (67,129) | (57,796)
Net | $ 36,203 | 47,709
Weighted Average Useful Life Remaining (in years) | 5 years |
Acquired technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 52,691 | 54,716
Accumulated Amortization | (47,546) | (39,644)
Net | $ 5,145 | 15,072
Weighted Average Useful Life Remaining (in years) | 2 years |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 25,096 | 25,813
Accumulated Amortization | (17,669) | (15,552)
Net | $ 7,427 | 10,261
Weighted Average Useful Life Remaining (in years) | 5 years |
Patent costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 11,032 | 17,909
Accumulated Amortization | (8,382) | (7,338)
Net | $ 2,650 | 10,571
Weighted Average Useful Life Remaining (in years) | 14 years |
Trade secrets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 19,374 | 19,431
Accumulated Amortization | (13,574) | (11,530)
Net | $ 5,800 | 7,901
Weighted Average Useful Life Remaining (in years) | 3 years |
Acquired patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 16,212 | 16,661
Accumulated Amortization | (13,160) | (11,969)
Net | $ 3,052 | 4,692
Weighted Average Useful Life Remaining (in years) | 7 years |
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 26,551 | 20,012
Accumulated Amortization | (18,553) | (17,435)
Net | $ 7,998 | $ 2,577
Weighted Average Useful Life Remaining (in years) | 1 year |
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 1 year |
Minimum | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 1 year |
Minimum | Acquired technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 1 year |
Minimum | Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 3 years |
Minimum | Patent costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 1 year |
Minimum | Trade secrets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 2 years |
Minimum | Acquired patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 6 years |
Minimum | Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 1 year |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 19 years |
Maximum | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 12 years |
Maximum | Acquired technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 2 years |
Maximum | Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 6 years |
Maximum | Patent costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 19 years |
Maximum | Trade secrets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 4 years |
Maximum | Acquired patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 8 years |
Maximum | Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life (in years) | 2 years |

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