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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Accumulated Amortization $ (137,796) $ (97,121)
Intangible assets, Gross 404,978 348,682
Intangible assets, Net $ 267,182 251,561
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 20,872 20,733
Intangible assets with finite lives: Accumulated Amortization (8,201) (7,369)
Intangible assets with finite lives: Net $ 12,671 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 $ 73,365 57,383
Intangible assets with finite lives: Accumulated Amortization (27,793) (18,241)
Intangible assets with finite lives: Net $ 45,572 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 (6,599) (5,517)
Intangible assets with finite lives: Net 2,473 3,556
Customer Relationships [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross 189,961 157,139
Intangible assets with finite lives: Accumulated Amortization (54,018) (36,975)
Intangible assets with finite lives: Net $ 135,943 120,164
Weighted average useful life 2 years  
Non-Compete Agreements [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 19,818 35,469
Intangible assets with finite lives: Accumulated Amortization (12,047) (11,784)
Intangible assets with finite lives: Net $ 7,771 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 $ 29,340 21,800
Intangible assets with finite lives: Accumulated Amortization (6,950) (4,455)
Intangible assets with finite lives: Net $ 22,390 17,345
Weighted average useful life 5 years  
Other [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Intangible assets with finite lives: Gross $ 56,675 39,100
Intangible assets with finite lives: Accumulated Amortization (16,313) (6,905)
Intangible assets with finite lives: Net $ 40,362 $ 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