XML 58 R64.htm IDEA: XBRL DOCUMENT v3.19.3
Debt - Secured Revolving Credit Facility (Details) - Goldman Sachs Bank USA - Revolving Credit Facility
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 100,000,000
Line of Credit Facility, Borrowings $ 0