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Business Combinations ITapp (Details) - USD ($)
$ in Thousands
Apr. 08, 2016
Jun. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill   $ 83,115 $ 55,669
General and Administrative Expense [Member]      
Business Acquisition [Line Items]      
Business acquisition, transaction costs   $ 900  
ITapp [Member]      
Business Acquisition [Line Items]      
Net tangible assets acquired $ 140    
Goodwill 11,437    
Net deferred tax liabilities(1) (2,015)    
Business combination, consideration transferred 14,462    
Developed technology [Member] | ITapp [Member]      
Business Acquisition [Line Items]      
Finite-lived intangibles $ 4,700    
Finite-lived intangible asset, useful life 5 years    
Customer contracts and related relationships [Member] | ITapp [Member]      
Business Acquisition [Line Items]      
Finite-lived intangibles $ 200    
Finite-lived intangible asset, useful life 1 year 6 months