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Business Combinations - Narrative (Details)
bed in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 05, 2017
USD ($)
bed
Nov. 30, 2017
USD ($)
Jul. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]              
Acquisition of CEC, net of cash acquired         $ 0 $ 0 $ 307,404
Outstanding balance       $ 2,620,269 2,620,269    
Goodwill       778,951 778,951 $ 615,433 $ 615,438
Community Education Centers              
Business Acquisition [Line Items]              
Facility, number of beds | bed 12            
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            
Outstanding balance 115,000            
Purchase price adjustment, decrease     $ 2,600   (909)    
Maximum potential adjustment to purchase price 1,900            
Measurement period adjustment       6,700      
Measurement period adjustment, valuation of an unfavorable contract liability       4,600      
Goodwill $ 172,343     165,656 165,656    
Revenue for CEC activity since acquisition       171,000      
Earnings for CEC activity since acquisition       22,000      
Other non-current liabilities       $ 5,100 562    
Acquisition-related Costs | Community Education Centers              
Business Acquisition [Line Items]              
Acquisition related costs         $ 15,000    
Assets Of One Of CEC Entities              
Business Acquisition [Line Items]              
Proceeds from sale of assets   $ 3,700          
Goodwill decrease   $ 2,200