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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Oct. 06, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 45,794   $ 50,630
EdgeRock Technologies, LLC [Member]      
Business Acquisition [Line Items]      
Accounts receivable   $ 10,870  
Other current assets   455  
Property and equipment   363  
Goodwill   16,445  
Other non-current assets   13  
Total assets   38,376  
Current liabilities   4,141  
Total liabilities   4,141  
Total purchase consideration   34,235  
Trademarks [Member] | EdgeRock Technologies, LLC [Member]      
Business Acquisition [Line Items]      
Other intangible assets:   1,340  
Customer Relationships [Member] | EdgeRock Technologies, LLC [Member]      
Business Acquisition [Line Items]      
Other intangible assets:   6,220  
Backlog [Member] | EdgeRock Technologies, LLC [Member]      
Business Acquisition [Line Items]      
Other intangible assets:   $ 2,670