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Debt Obligations, net (Secured Term Loan and Credit Facility Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2021 | Dec. 31, 2020
Line of Credit Facility [Line Items] |  |  |  |
Long-term debt, outstanding balance |  |  | $ 3,318,141,000 | $ 3,325,450,000
Senior Term Loan | LIBOR |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis point spread on variable interest rate |  |  | 1.00% |
Secured Debt |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long-term debt, outstanding balance |  |  | $ 1,205,641,000 | 1,212,950,000
Secured Debt | Senior Term Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 650,000,000.0 |  |
Long-term debt, outstanding balance |  |  | $ 491,875,000 | 491,875,000
Secured Debt | Senior Term Loan | LIBOR |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis point spread on variable interest rate |  | 2.75% | 2.75% |
Secured Debt | Senior Term Loan | LIBOR | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis point spread on variable interest rate |  |  | 1.75% |
Secured Debt | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long-term debt, outstanding balance |  |  | $ 0 | $ 0
Maximum borrowing capacity | $ 350,000,000.0 |  |  |
Debt instrument term | 1 year |  |  |
Current borrowing capacity |  |  | $ 350,000,000.0 |
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 |  |  | 2.00% |
Secured Debt | Revolving Credit Facility | LIBOR | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis point spread on variable interest rate | 2.00% |  | 1.00% |
Secured Debt | Revolving Credit Facility | LIBOR | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis point spread on variable interest rate | 2.50% |  |  |
Secured Debt | Revolving Credit Facility | Base Rate | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis point spread on variable interest rate | 1.00% |  |  |
Secured Debt | Revolving Credit Facility | Base Rate | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis point spread on variable interest rate | 1.50% |  |  |

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