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Debt Obligations, net - Secured Term Loan and Credit Facility Narrative (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2020
Senior Term Loan | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.00%
Secured Debt | Senior Term Loan |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, face amount |  | $ 650,000,000.0 |
Required quarterly principal payment (as a percent) |  | 0.25% |
Secured Debt | Senior Term Loan | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis point spread on variable interest rate (as a percent) |  | 2.75% | 2.75%
Secured Debt | Senior Term Loan | LIBOR | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.75%
Secured Debt | Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ 350,000,000.0 |  |
Debt instrument term (in years) |  |  | 1 year
Current borrowing capacity |  |  | $ 330,000,000.0
Secured Debt | Revolving Credit Facility | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee percentage |  |  | 0.25%
Secured Debt | Revolving Credit Facility | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee percentage |  |  | 0.45%
Secured Debt | Revolving Credit Facility | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 2.00%
Secured Debt | Revolving Credit Facility | LIBOR | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis point spread on variable interest rate (as a percent) | 2.00% |  | 1.00%
Secured Debt | Revolving Credit Facility | LIBOR | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis point spread on variable interest rate (as a percent) | 2.50% |  |
Secured Debt | Revolving Credit Facility | Base Rate | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis point spread on variable interest rate (as a percent) | 1.00% |  |
Secured Debt | Revolving Credit Facility | Base Rate | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis point spread on variable interest rate (as a percent) | 1.50% |  |

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