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Acquisitions - Schedule of Business Acquisition, By Acquisition (Details) - USD ($)
$ in Thousands
May 01, 2018
Jan. 02, 2018
Jun. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill     $ 172,975 $ 144,835
Hula Partners        
Business Acquisition [Line Items]        
Cash purchase price   $ 10,000    
Goodwill   8,527    
Total assets   10,000    
Hula Partners [Member]        
Business Acquisition [Line Items]        
Cash purchase price $ 30,493      
Business Combinations, Fair Value of Contingent Consideration 905      
Business Combination, Consideration Transferred 31,398      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 536      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 3,104      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Fixed Assets 368      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue 979      
Goodwill 21,494      
Total assets 36,106      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable 898      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent 2,831      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 4,708      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 31,398      
Customer relationships | Hula Partners        
Business Acquisition [Line Items]        
Intangible assets, other than goodwill   $ 1,367    
Acquired finite-lived intangible assets, weighted average useful life   4 years    
Customer relationships | Hula Partners [Member]        
Business Acquisition [Line Items]        
Intangible assets, other than goodwill $ 10,365      
Acquired finite-lived intangible assets, weighted average useful life 8 years      
Marketing-Related Intangible Assets | Hula Partners        
Business Acquisition [Line Items]        
Intangible assets, other than goodwill   $ 106    
Acquired finite-lived intangible assets, weighted average useful life   2 years    
Marketing-Related Intangible Assets | Hula Partners [Member]        
Business Acquisition [Line Items]        
Intangible assets, other than goodwill $ 239      
Acquired finite-lived intangible assets, weighted average useful life 3 years