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Goodwill and Related Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets $ 129,165 $ 84,524
Total acquired intangible assets, Gross Carrying Amount 184,638 127,244
Accumulated Amortization, Finite-lived intangible assets 52,766 45,029
Total acquired intangible assets, Accumulated Amortization 52,766 45,029
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets 5,894 3,886
Accumulated Amortization, Finite-lived intangible assets 1,738 1,827
Unpatented technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets 28,077 24,527
Accumulated Amortization, Finite-lived intangible assets 10,197 8,768
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets 85,605 52,974
Accumulated Amortization, Finite-lived intangible assets 34,372 31,554
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets 3,107 1,807
Accumulated Amortization, Finite-lived intangible assets 1,694 1,550
Backlog    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-lived intangible assets 6,482 1,330
Accumulated Amortization, Finite-lived intangible assets 4,765 1,330
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Indefinite-lived intangible assets 55,473 42,720
Accumulated Amortization, Indefinite-lived intangible assets $ 0 $ 0
Minimum | Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 2 years  
Minimum | Unpatented technology    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 5 years  
Minimum | Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 5 years  
Minimum | Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 4 years  
Minimum | Backlog    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 6 months  
Maximum | Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 15 years  
Maximum | Unpatented technology    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 20 years  
Maximum | Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 17 years  
Maximum | Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 10 years  
Maximum | Backlog    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life 2 years