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Business Acquisitions - Total Purchase Price and Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Apr. 30, 2015
Apr. 30, 2015
Apr. 21, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Total Purchase Price            
Cash $ 3,789 $ 3,789        
Accounts receivable 7,350 7,350        
Inventory 5,008 5,008        
Deferred tax assets and other current assets 457 457        
Total current assets 16,604 16,604        
Property and equipment 463 463        
Intangibles 14,051 14,051        
Goodwill 26,126 26,126   $ 149,654   $ 122,720
Other non-current assets 52 52        
Total assets 57,296 57,296        
Current liabilities 7,809 7,809        
Non-current deferred tax liabilities 3,833 3,833        
Deferred service revenue and gross profit 3,242 3,242        
Other non-current liabilities 1,056 1,056        
Total purchase price 41,356 41,356        
Total purchase price, net of cash received   37,567   $ 23,625 $ 0  
Mach4 [Member]            
Total Purchase Price            
Cash     $ 397      
Accounts receivable     3,743      
Inventory     3,580      
Deferred tax assets and other current assets     368      
Total current assets     8,088      
Property and equipment     463      
Intangibles     7,710      
Goodwill     10,520      
Other non-current assets     52      
Total assets     26,833      
Current liabilities     3,684      
Non-current deferred tax liabilities     2,564      
Deferred service revenue and gross profit     2,314      
Other non-current liabilities     1,056      
Total purchase price     17,215      
Total purchase price, net of cash received     16,818      
Identifiable Intangible Assets            
Fair value of identifiable intangible assets purchased     7,710      
Avantec [Member]            
Total Purchase Price            
Cash 3,392 3,392        
Accounts receivable 3,607 3,607        
Inventory 1,428 1,428        
Deferred tax assets and other current assets 89 89        
Total current assets 8,516 8,516        
Property and equipment 0 0        
Intangibles 6,341 6,341        
Goodwill 15,606 15,606        
Other non-current assets 0 0        
Total assets 30,463 30,463        
Current liabilities 4,125 4,125        
Non-current deferred tax liabilities 1,269 1,269        
Deferred service revenue and gross profit 928 928        
Other non-current liabilities 0 0        
Total purchase price 24,141 $ 24,141        
Total purchase price, net of cash received 20,749          
Identifiable Intangible Assets            
Fair value of identifiable intangible assets purchased 6,341          
Developed Technology [Member] | Mach4 [Member]            
Identifiable Intangible Assets            
Fair value of identifiable intangible assets purchased     $ 3,290      
Weighted average useful life (in years)     8 years      
Trade names [Member] | Mach4 [Member]            
Identifiable Intangible Assets            
Fair value of identifiable intangible assets purchased     $ 850      
Weighted average useful life (in years)     6 years      
Trade names [Member] | Avantec [Member]            
Identifiable Intangible Assets            
Fair value of identifiable intangible assets purchased $ 92          
Weighted average useful life (in years) 2 years          
Customer relationships [Member] | Mach4 [Member]            
Identifiable Intangible Assets            
Fair value of identifiable intangible assets purchased     $ 3,570      
Customer relationships [Member] | Avantec [Member]            
Identifiable Intangible Assets            
Fair value of identifiable intangible assets purchased $ 5,834          
Weighted average useful life (in years) 12 years          
Backlog [Member] | Avantec [Member]            
Identifiable Intangible Assets            
Fair value of identifiable intangible assets purchased $ 415          
Weighted average useful life (in years) 2 years          
Minimum [Member] | Customer relationships [Member] | Mach4 [Member]            
Identifiable Intangible Assets            
Weighted average useful life (in years)     11 years      
Maximum [Member] | Customer relationships [Member] | Mach4 [Member]            
Identifiable Intangible Assets            
Weighted average useful life (in years)     12 years