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Subsequent Events (Details)
3 Months Ended
May 02, 2019
bed
contract
Apr. 25, 2019
bed
Apr. 03, 2019
$ / shares
Mar. 31, 2019
$ / shares
Mar. 31, 2018
$ / shares
Subsequent Event [Line Items]          
Dividends declared per share (in dollars per share) | $ / shares       $ 0.48 $ 0.47
Subsequent Event          
Subsequent Event [Line Items]          
Dividends declared per share (in dollars per share) | $ / shares     $ 0.48    
Subsequent Event | Bureau Of Prisons (BOP)          
Subsequent Event [Line Items]          
Contract term 10 years        
Subsequent Event | Bureau Of Prisons (BOP) | North Lake Correctional Facility          
Subsequent Event [Line Items]          
Contract term 10 years        
Number of beds in detention facility 1,800        
Subsequent Event | Bureau Of Prisons (BOP) | Reeves County Detention Center I & II          
Subsequent Event [Line Items]          
Contract term 10 years        
Number of beds in detention facility 1,800        
Number of new contracts | contract 2        
Subsequent Event | Bureau Of Prisons (BOP) | Reeves County Detention Center III          
Subsequent Event [Line Items]          
Number of beds in detention facility 1,376        
Subsequent Event | Immigration and Customs Enforcement | South Louisiana ICE Processing Center          
Subsequent Event [Line Items]          
Number of beds in detention facility   1,000