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Description of Business and Summary of Significant Accounting Policies (Goodwill) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2016
Jul. 01, 2016
Business Combination Segment Allocation [Line Items]        
Document Period End Date Jun. 30, 2017      
Goodwill $ 441,404 $ 402,259 $ 441,404  
Goodwill [Roll Forward]        
Beginning Balance 441,404 402,259    
Goodwill, Acquired During Period 117,336 35,787    
Goodwill, Purchase Accounting Adjustments (1,632) 4,298    
Foreign currency translation adjustments 394 (940)    
Ending Balance 557,502 $ 441,404    
RCS [Member]        
Business Combination Segment Allocation [Line Items]        
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount     $ 36,800  
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount     39.00%  
Reporting Unit, Assessed Fair Value     $ 130,000  
Reporting Unit, Carrying Value     93,200  
Fair Value Inputs, Discount Rate   15.00%    
Goodwill 68,300 $ 68,300 $ 68,300  
Goodwill [Roll Forward]        
Beginning Balance $ 68,300      
Ending Balance   $ 68,300    
Minimum [Member] | RCS [Member]        
Business Combination Segment Allocation [Line Items]        
Fair Value Inputs, Long-term Revenue Growth Rate   5.00%    
Maximum [Member] | RCS [Member]        
Business Combination Segment Allocation [Line Items]        
Fair Value Inputs, Long-term Revenue Growth Rate   15.00%    
EbixHealth JV [Member]        
Business Combination Segment Allocation [Line Items]        
Goodwill       $ 20,838