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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Accumulated Amortization $ (122,973) $ (97,121)
Intangible assets, Gross 410,459 348,682
Intangible assets, Net $ 287,486 251,561
Weighted average useful life 4 years  
Trademarks [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets   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 21,304 20,733
Intangible assets with finite lives: Accumulated Amortization (7,906) (7,369)
Intangible assets with finite lives: Net $ 13,398 13,364
Weighted average useful life 3 years  
Acquired Technology [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 74,096 57,383
Intangible assets with finite lives: Accumulated Amortization (24,427) (18,241)
Intangible assets with finite lives: Net $ 49,669 39,142
Weighted average useful life 4 years  
Internally Developed Software [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 9,072 9,073
Intangible assets with finite lives: Accumulated Amortization (6,238) (5,517)
Intangible assets with finite lives: Net 2,834 3,556
Customer Relationships [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 193,015 157,139
Intangible assets with finite lives: Accumulated Amortization (47,426) (36,975)
Intangible assets with finite lives: Net $ 145,589 120,164
Weighted average useful life 2 years  
Non-Compete Agreements [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 35,526 35,469
Intangible assets with finite lives: Accumulated Amortization (14,301) (11,784)
Intangible assets with finite lives: Net $ 21,225 23,685
Weighted average useful life 3 years  
Trade Names [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 29,881 21,800
Intangible assets with finite lives: Accumulated Amortization (5,890) (4,455)
Intangible assets with finite lives: Net $ 23,991 17,345
Weighted average useful life 5 years  
Other [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 41,690 39,100
Intangible assets with finite lives: Accumulated Amortization (10,910) (6,905)
Intangible assets with finite lives: Net $ 30,780 $ 32,195
Weighted average useful life 1 year  
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 5 years  
Minimum [Member] | Acquired Technology [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 3 years  
Minimum [Member] | Internally Developed Software [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 1 year  
Minimum [Member] | Customer Relationships [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 3 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 4 years  
Maximum [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 20 years  
Maximum [Member] | Patent Costs [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 20 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]    
Intangible assets, useful life 8 years  
Weighted average useful life 1 year  
Maximum [Member] | Customer Relationships [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets, useful life 11 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 10 years