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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 258,227 | $ 260,047
Intangible assets with finite lives: Accumulated Amortization | (166,427) | (161,264)
Intangible assets with finite lives: Net | $ 91,800 | 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 | $ 107,094 | 105,505
Intangible assets with finite lives: Accumulated Amortization | (61,287) | (57,796)
Intangible assets with finite lives: Net | $ 45,807 | 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 | $ 50,370 | 54,716
Intangible assets with finite lives: Accumulated Amortization | (38,108) | (39,644)
Intangible assets with finite lives: Net | $ 12,262 | 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 | $ 25,972 | 25,813
Intangible assets with finite lives: Accumulated Amortization | (16,381) | (15,552)
Intangible assets with finite lives: Net | $ 9,591 | 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 | $ 18,230 | 17,909
Intangible assets with finite lives: Accumulated Amortization | (8,069) | (7,338)
Intangible assets with finite lives: Net | $ 10,161 | 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 | $ 19,601 | 19,431
Intangible assets with finite lives: Accumulated Amortization | (12,117) | (11,530)
Intangible assets with finite lives: Net | $ 7,484 | 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 | $ 16,690 | 16,661
Intangible assets with finite lives: Accumulated Amortization | (12,390) | (11,969)
Intangible assets with finite lives: Net | $ 4,300 | 4,692
Weighted average useful life remaining (in years) | 8 years |
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets with finite lives: Gross | $ 20,270 | 20,012
Intangible assets with finite lives: Accumulated Amortization | (18,075) | (17,435)
Intangible assets with finite lives: Net | $ 2,195 | $ 2,577
Weighted average useful life remaining (in years) | 2 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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