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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Accumulated Amortization $ (97,608) $ (69,554)
Intangible assets, Gross 325,947 211,263
Intangible assets, Net 228,339 141,709
Weighted average useful life 4 years  
Trademarks [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 2,110 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 22,009 21,545
Intangible assets with finite lives: Accumulated Amortization (7,519) (5,960)
Intangible assets with finite lives: Net 14,490 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 60,596 30,095
Intangible assets with finite lives: Accumulated Amortization (16,417) (13,615)
Intangible assets with finite lives: Net 44,179 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 17,851 18,097
Intangible assets with finite lives: Accumulated Amortization (13,934) (12,863)
Intangible assets with finite lives: Net 3,917 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 133,077 95,793
Intangible assets with finite lives: Accumulated Amortization (33,708) (18,283)
Intangible assets with finite lives: Net 99,369 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 35,087 16,848
Intangible assets with finite lives: Accumulated Amortization (10,457) (6,666)
Intangible assets with finite lives: Net 24,630 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 21,193 9,302
Intangible assets with finite lives: Accumulated Amortization (4,174) (2,211)
Intangible assets with finite lives: Net 17,019 7,091
Weighted average useful life 3 years  
Other [Member]
    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 28,149 11,598
Intangible assets with finite lives: Accumulated Amortization (5,524) (4,081)
Intangible assets with finite lives: Net $ 22,625 $ 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