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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Accumulated Amortization $ (114,316) $ (104,963)
Intangible assets, Gross 265,682 262,429
Intangible assets, Net $ 151,366 157,466
Weighted average useful life remaining (in years) 5 years  
Patents Costs [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 16,547 16,251
Intangible assets with finite lives: Accumulated Amortization (5,248) (4,895)
Intangible assets with finite lives: Net $ 11,299 11,356
Weighted average useful life remaining (in years) 8 years  
Acquired Technology [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 53,735 52,809
Intangible assets with finite lives: Accumulated Amortization (19,497) (16,405)
Intangible assets with finite lives: Net $ 34,238 36,404
Weighted average useful life remaining (in years) 4 years  
Internally Developed Software [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 4,730 4,730
Intangible assets with finite lives: Accumulated Amortization (3,069) (2,919)
Intangible assets with finite lives: Net $ 1,661 1,811
Intangible assets estimated useful lives 3 years  
Weighted average useful life remaining (in years) 3 years  
Customer Relationships [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 103,825 101,933
Intangible assets with finite lives: Accumulated Amortization (39,768) (36,158)
Intangible assets with finite lives: Net $ 64,057 65,775
Weighted average useful life remaining (in years) 7 years  
Non-Compete Agreements [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 12,043 12,163
Intangible assets with finite lives: Accumulated Amortization (8,722) (8,558)
Intangible assets with finite lives: Net $ 3,321 3,605
Weighted average useful life remaining (in years) 3 years  
Trade Names [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 28,347 28,108
Intangible assets with finite lives: Accumulated Amortization (13,456) (12,498)
Intangible assets with finite lives: Net $ 14,891 15,610
Weighted average useful life remaining (in years) 6 years  
Other [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 46,455 46,435
Intangible assets with finite lives: Accumulated Amortization (24,556) (23,530)
Intangible assets with finite lives: Net $ 21,899 $ 22,905
Weighted average useful life remaining (in years) 5 years  
Minimum [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Minimum [Member] | Patents Costs [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Minimum [Member] | Acquired Technology [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 2 years  
Minimum [Member] | Customer Relationships [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 2 years  
Minimum [Member] | Non-Compete Agreements [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 2 years  
Minimum [Member] | Trade Names [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Minimum [Member] | Other [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 1 year  
Maximum [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 19 years  
Maximum [Member] | Patents Costs [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 19 years  
Maximum [Member] | Acquired Technology [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 15 years  
Maximum [Member] | Customer Relationships [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 15 years  
Maximum [Member] | Non-Compete Agreements [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 5 years  
Maximum [Member] | Trade Names [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 9 years  
Maximum [Member] | Other [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets estimated useful lives 7 years