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Debt Obligations, net (Debt Covenants) (Details)
Dec. 31, 2020
Unsecured Debt  
Debt Instrument [Line Items]  
Unencumbered assets to unsecured indebtedness ratio 1.2
Secured Debt | 2016 Senior Term Loan  
Debt Instrument [Line Items]  
Collateral coverage ratio 1.25
Secured Debt | Revolving Credit Facility  
Debt Instrument [Line Items]  
Borrowing base asset value ratio 1.5
Cash flow to fixed charges ratio 1.5