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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Accumulated Amortization $ (161,870) $ (134,350)
Intangible assets, Gross $ 268,502 255,851
Weighted average useful life remaining (in years) 4 years  
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 106,674 99,067
Intangible assets with finite lives: Accumulated Amortization (56,538) (46,252)
Intangible assets with finite lives: Net $ 50,136 52,815
Weighted average useful life remaining (in years) 6 years  
Acquired Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 55,148 52,881
Intangible assets with finite lives: Accumulated Amortization (37,324) (27,543)
Intangible assets with finite lives: Net $ 17,824 25,338
Weighted average useful life remaining (in years) 4 years  
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 27,764 28,110
Intangible assets with finite lives: Accumulated Amortization (16,322) (16,015)
Intangible assets with finite lives: Net $ 11,442 12,095
Weighted average useful life remaining (in years) 5 years  
Patent Costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 17,135 16,263
Intangible assets with finite lives: Accumulated Amortization (6,794) (5,873)
Intangible assets with finite lives: Net $ 10,341 10,390
Weighted average useful life remaining (in years) 9 years  
Trade Secrets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 19,443 19,134
Intangible assets with finite lives: Accumulated Amortization (11,016) (9,383)
Intangible assets with finite lives: Net $ 8,427 9,751
Intangible assets estimated useful lives 7 years  
Weighted average useful life remaining (in years) 4 years  
Acquired Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 16,655 16,965
Intangible assets with finite lives: Accumulated Amortization (11,556) (10,674)
Intangible assets with finite lives: Net $ 5,099 6,291
Weighted average useful life remaining (in years) 4 years  
Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 25,683 23,431
Intangible assets with finite lives: Accumulated Amortization (22,320) (18,610)
Intangible assets with finite lives: Net $ 3,363 $ 4,821
Weighted average useful life remaining (in years) 2 years  
Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Minimum [Member] | Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Minimum [Member] | Acquired Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Minimum [Member] | Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Minimum [Member] | Patent Costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Minimum [Member] | Acquired Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Minimum [Member] | Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 2 years  
Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 20 years  
Maximum [Member] | Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 14 years  
Maximum [Member] | Acquired Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 16 years  
Maximum [Member] | Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 8 years  
Maximum [Member] | Patent Costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 20 years  
Maximum [Member] | Acquired Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 6 years  
Maximum [Member] | Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 4 years