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Debt (Nonrecourse Debt) (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Debt Instrument [Line Items]      
Long term debt $ 2,343,342,000 $ 2,408,297,000  
Restricted cash and cash equivalents - current 27,229,000   $ 33,536,000
Non Recourse Debt 2011 Revenue Bonds      
Debt Instrument [Line Items]      
Long term debt $ 54,400,000    
Stated interest rate 5.25%    
Non Recourse Debt 2011 Revenue Bonds | Northwest Detention Center      
Debt Instrument [Line Items]      
Non-recourse debt $ 15,700,000    
Current portion of non-recourse debt 7,700,000    
Non Recourse Debt Northwest Detention Center | Northwest Detention Center      
Debt Instrument [Line Items]      
Restricted cash and cash equivalents - current $ 8,300