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Business Combinations - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 05, 2017
USD ($)
bed
Jul. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]            
Acquisition of CEC, net of cash acquired       $ 353,555 $ 0  
Goodwill     $ 781,972 781,972   $ 615,433
Community Education Centers            
Business Acquisition [Line Items]            
Number of beds in facility (more than 12,000) | bed 12,000          
Percentage of voting interests acquired 100.00%          
Acquisition of CEC, net of cash acquired $ 353,600          
Cash acquired from acquisition 3,000          
Acquisition related costs 4,100          
Debt outstanding 115,000          
Purchase price adjustment, decrease   $ 2,600        
Maximum potential adjustment to purchase price 1,900          
Measurement period adjustment     6,000      
Measurement period adjustment, valuation of an unfavorable contract liability     4,600      
Goodwill $ 166,493          
Revenue for CEC activity since acquisition     114,000 56,700    
Earnings for CEC activity since acquisition     $ 14,000 2,600    
Acquisition-related Costs | Community Education Centers            
Business Acquisition [Line Items]            
Acquisition related costs       $ 14,000