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Subsequent Events (Details)
$ / shares in Units, bed in Thousands, $ in Millions
1 Months Ended 3 Months Ended
Apr. 25, 2017
$ / shares
Apr. 13, 2017
Bed
Apr. 05, 2017
USD ($)
bed
Apr. 30, 2017
shares
Mar. 31, 2017
$ / shares
shares
Mar. 31, 2016
$ / shares
Subsequent Event [Line Items]            
Dividends declared per share (in US dollars per share) | $ / shares         $ 0.47 $ 0.43
Restricted Stock            
Subsequent Event [Line Items]            
Granted shares         622,000  
Subsequent Event            
Subsequent Event [Line Items]            
Dividends declared per share (in US dollars per share) | $ / shares $ 0.47          
Subsequent Event | Restricted Stock            
Subsequent Event [Line Items]            
Granted shares       301,500    
Subsequent Event | Market and Performance-based Award            
Subsequent Event [Line Items]            
Granted shares       180,000    
Subsequent Event | Community Education Centers            
Subsequent Event [Line Items]            
Cash payments to acquire business | $     $ 360.0      
Transaction related expenses | $     $ 4.1      
Facility, number of beds | bed     12      
Immigration and Customs Enforcement | Subsequent Event            
Subsequent Event [Line Items]            
Number of beds in detention facility | Bed   1,000        
Contract award, term   10 years