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Business Combinations - Narrative and Schedule of Business Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 22, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Business Acquisition [Line Items]            
Goodwill   $ 160,122   $ 160,122   $ 19,978
Payments to Acquire Businesses, Gross $ 232,000          
Revenue   83,109 $ 67,551 162,844 $ 150,838  
Operating income (loss)   8,135 $ 12,161 13,309 $ 41,230  
Inventus Solutions Inc., Discovery Services            
Business Acquisition [Line Items]            
Current assets   19,357   19,357    
Property, plant, equipment and other long term assets   3,347   3,347    
Deferred tax asset   10,595   10,595    
Current liabilities   (7,280)   (7,280)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent   (5,477)   (5,477)    
Other long term liabilities   (826)   (826)    
Payments to Acquire Businesses, Gross $ 233,300          
Inventus Solutions Inc., Discovery Services            
Business Acquisition [Line Items]            
Acquisition related costs   1,200        
Revenue   19,300   29,800    
Operating income (loss)   3,037   3,620    
Transaction costs   13,500   13,500    
Inventus Solutions Inc., Discovery Services | Operating Segments            
Business Acquisition [Line Items]            
Goodwill   140,144   $ 140,144   $ 0
Customer relationships            
Business Acquisition [Line Items]            
Finite-lived intangible assets, useful life       9 years 3 months 18 days    
Customer relationships | Inventus Solutions Inc., Discovery Services            
Business Acquisition [Line Items]            
Intangible assets   58,000   $ 58,000    
Trademarks            
Business Acquisition [Line Items]            
Finite-lived intangible assets, useful life       4 years 10 months 25 days    
Trademarks | Inventus Solutions Inc., Discovery Services            
Business Acquisition [Line Items]            
Intangible assets   3,200   $ 3,200    
Developed technology            
Business Acquisition [Line Items]            
Finite-lived intangible assets, useful life       3 years    
Developed technology | Inventus Solutions Inc., Discovery Services            
Business Acquisition [Line Items]            
Intangible assets   $ 6,400   $ 6,400    
Minimum | Customer relationships            
Business Acquisition [Line Items]            
Finite-lived intangible assets, useful life       9 years    
Minimum | Trademarks            
Business Acquisition [Line Items]            
Finite-lived intangible assets, useful life       1 year    
Maximum | Customer relationships            
Business Acquisition [Line Items]            
Finite-lived intangible assets, useful life       10 years    
Maximum | Trademarks            
Business Acquisition [Line Items]            
Finite-lived intangible assets, useful life       6 years