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Debt (Nonrecourse Debt) (Details)
$ in Thousands, AUD in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
AUD
Dec. 31, 2015
AUD
Dec. 09, 2011
USD ($)
Debt Instrument [Line Items]            
Outstanding balance $ 2,459,340          
Long term debt 1,935,465 $ 1,855,810        
Loss on extinguishment of debt (15,885) 0 $ 0      
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 472,207 225,762        
Northwest Detention Center | Non Recourse Debt Northwest Detention Center            
Debt Instrument [Line Items]            
Current restricted cash 5,900          
Northwest Detention Center | Non Recourse Debt            
Debt Instrument [Line Items]            
Non-recourse debt 36,700          
Current portion of non-recourse debt 6,700          
Fulham | Australian Subsidiary's Non Recourse Debt            
Debt Instrument [Line Items]            
Non-recourse debt $ 2,600 $ 9,000   AUD 3.6 AUD 12.4  
Interest rate terms variable rate quoted by certain Australian banks plus 140 basis points          
Non current restricted cash $ 3,600     AUD 5.0