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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 251,420 | $ 260,047
Intangible assets with finite lives: Accumulated Amortization | (169,279) | (161,264)
Intangible assets with finite lives: Net | $ 82,141 | 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 | $ 104,015 | 105,505
Intangible assets with finite lives: Accumulated Amortization | (62,349) | (57,796)
Intangible assets with finite lives: Net | $ 41,666 | 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 | $ 48,973 | 54,716
Intangible assets with finite lives: Accumulated Amortization | (39,803) | (39,644)
Intangible assets with finite lives: Net | $ 9,170 | 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 | $ 25,284 | 25,813
Intangible assets with finite lives: Accumulated Amortization | (16,503) | (15,552)
Intangible assets with finite lives: Net | $ 8,781 | 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 | $ 17,972 | 17,909
Intangible assets with finite lives: Accumulated Amortization | (7,825) | (7,338)
Intangible assets with finite lives: Net | $ 10,147 | 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 | $ 19,331 | 19,431
Intangible assets with finite lives: Accumulated Amortization | (12,522) | (11,530)
Intangible assets with finite lives: Net | $ 6,809 | 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 | $ 16,217 | 16,661
Intangible assets with finite lives: Accumulated Amortization | (12,355) | (11,969)
Intangible assets with finite lives: Net | $ 3,862 | 4,692
Weighted average useful life remaining (in years) | 8 years |
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 19,628 | 20,012
Intangible assets with finite lives: Accumulated Amortization | (17,922) | (17,435)
Intangible assets with finite lives: Net | $ 1,706 | $ 2,577
Weighted average useful life remaining (in years) | 2 years |

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