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Debt (Nonrecourse Debt) (Details)
$ in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
AUD ($)
Dec. 09, 2011
USD ($)
Debt Instrument [Line Items]          
Outstanding balance $ 2,777,423        
Long term debt 2,397,227 $ 2,181,544      
Current restricted cash 51,678 44,932 $ 17,133    
Loss on extinguishment of debt 0 0 $ (15,885)    
Non Recourse Debt 2011 Revenue Bonds          
Debt Instrument [Line Items]          
Long term debt         $ 54,400
Stated interest rate         6.40%
Non Recourse Debt          
Debt Instrument [Line Items]          
Non-recourse debt 337,027 $ 384,415      
Northwest Detention Center | Non Recourse Debt Northwest Detention Center          
Debt Instrument [Line Items]          
Current restricted cash 5,700        
Northwest Detention Center | Non Recourse Debt 2011 Revenue Bonds          
Debt Instrument [Line Items]          
Non-recourse debt 23,000        
Current portion of non-recourse debt 7,300        
Fulham | Australian Subsidiary's Non Recourse Debt          
Debt Instrument [Line Items]          
Non-recourse debt $ 2,600     $ 3.6  
Interest rate terms variable rate quoted by certain Australian banks plus 140 basis points