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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]        
Loss on early extinguishment of debt $ 0 $ 7,924 $ 0 $ 12,038
Unsecured notes        
Debt Instrument [Line Items]        
Loss on early extinguishment of debt       $ 12,000