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Senior Secured Term Loan, Net (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]        
Repayments of senior secured term loan principal   $ 1,300,000 $ 1,250,000 $ 0
London Interbank Offered Rate (LIBOR) | Interest Rate Swap        
Debt Instrument [Line Items]        
Fixed interest rate 2.12%      
Secured Debt        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 500,000,000.0      
Debt instrument, issuance price as a percentage 99.50%      
Debt instrument, covenant, non-recourse debt to tangible net worth ratio, maximum 3      
Debt instrument, covenant, unencumbered assets to pari-passu indebtedness ratio, maximum 1.25      
Effective interest rate 4.87%      
Secured Debt | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.75%