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Summary of Significant Accounting Policies - Goodwill (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 13, 2016
USD ($)
Jul. 01, 2016
USD ($)
Goodwill        
Number of reporting units | item 3      
Goodwill $ 621,390 $ 566,106    
Changes in goodwill        
Balance as of beginning of period 621,390 566,106    
Other acquisitions and measurement period adjustments 13,223 6,148    
Balance as of end of period 742,054 621,390    
4D Pharmacy Management Systems, Inc.        
Changes in goodwill        
Acquisition   49,136    
AFSC        
Goodwill        
Goodwill       $ 76,736
Changes in goodwill        
Acquisition 76,736      
Veridicus        
Goodwill        
Goodwill     $ 30,705  
Changes in goodwill        
Acquisition 30,705      
Commercial        
Goodwill        
Goodwill 242,255 242,255    
Changes in goodwill        
Balance as of beginning of period 242,255      
Balance as of end of period 242,255 242,255    
Government        
Goodwill        
Goodwill 18,363 18,363    
Changes in goodwill        
Balance as of beginning of period 18,363      
Balance as of end of period $ 108,321 18,363    
Government | Discounted cash flow        
Goodwill        
Weights applied to determine fair value of goodwill (as a percent) 75.00%      
Government | Guideline Company        
Goodwill        
Weights applied to determine fair value of goodwill (as a percent) 25.00%      
Pharmacy Management        
Goodwill        
Goodwill $ 360,772 360,772    
Changes in goodwill        
Balance as of beginning of period 360,772      
Balance as of end of period $ 391,478 $ 360,772