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Debt (Nonrecourse Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 09, 2011
Debt Instrument [Line Items]        
Long term debt $ 2,408,297 $ 2,397,227    
Current restricted cash 32,418 $ 51,678 $ 44,932  
Non Recourse Debt 2011 Revenue Bonds        
Debt Instrument [Line Items]        
Long term debt       $ 54,400
Stated interest rate       6.40%
Northwest Detention Center | Non Recourse Debt Northwest Detention Center        
Debt Instrument [Line Items]        
Current restricted cash 4,700      
Northwest Detention Center | Non Recourse Debt 2011 Revenue Bonds        
Debt Instrument [Line Items]        
Non-recourse debt 15,700      
Current portion of non-recourse debt $ 7,700