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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Accumulated Amortization $ (87,119) $ (69,554)
Intangible assets, Gross 264,902 211,263
Intangible assets, Net 177,783 141,709
Weighted average useful life 4 years  
Trademarks [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 5,910 2,110
Licenses [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 5,875 5,875
Intangible assets with finite lives: Accumulated Amortization (5,875) (5,875)
Patent Costs [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 22,211 21,545
Intangible assets with finite lives: Accumulated Amortization (7,195) (5,960)
Intangible assets with finite lives: Net 15,016 15,585
Weighted average useful life 3 years  
Acquired Technology [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 44,591 30,095
Intangible assets with finite lives: Accumulated Amortization (15,410) (13,615)
Intangible assets with finite lives: Net 29,181 16,480
Weighted average useful life 5 years  
Internally Developed Software [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 17,862 18,097
Intangible assets with finite lives: Accumulated Amortization (13,583) (12,863)
Intangible assets with finite lives: Net 4,279 5,234
Intangible assets, useful life 5 years  
Customer Relationships [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 113,067 95,793
Intangible assets with finite lives: Accumulated Amortization (28,021) (18,283)
Intangible assets with finite lives: Net 85,046 77,510
Weighted average useful life 5 years  
Non-Compete Agreements [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 21,010 16,848
Intangible assets with finite lives: Accumulated Amortization (8,758) (6,666)
Intangible assets with finite lives: Net 12,252 10,182
Weighted average useful life 3 years  
Trade Names [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 10,708 9,302
Intangible assets with finite lives: Accumulated Amortization (3,459) (2,211)
Intangible assets with finite lives: Net 7,249 7,091
Weighted average useful life 3 years  
Other [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 23,668 11,598
Intangible assets with finite lives: Accumulated Amortization (4,818) (4,081)
Intangible assets with finite lives: Net $ 18,850 $ 7,517
Weighted average useful life 2 years  
Minimum [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 1 year  
Minimum [Member] | Patent Costs [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 6 years  
Minimum [Member] | Acquired Technology [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 5 years  
Minimum [Member] | Customer Relationships [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 5 years  
Minimum [Member] | Non-Compete Agreements [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 3 years  
Minimum [Member] | Trade Names [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 2 years  
Minimum [Member] | Other [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 1 year  
Maximum [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 13 years  
Maximum [Member] | Patent Costs [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 7 years  
Maximum [Member] | Acquired Technology [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 10 years  
Maximum [Member] | Internally Developed Software [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Weighted average useful life 1 year  
Maximum [Member] | Customer Relationships [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 13 years  
Maximum [Member] | Non-Compete Agreements [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 11 years  
Maximum [Member] | Trade Names [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 10 years  
Maximum [Member] | Other [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 7 years