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Debt Obligations, net - Secured Term Loan and Credit Facility Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Aug. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2015
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 468,000 | $ 372,000 |  |  |
2016 Senior Term Loan | LIBOR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.00% |  |  |  |
Secured Debt | 2016 Senior Term Loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 650,000,000.0 | $ 400,000,000.0 |  |  | $ 500,000,000.0 | $ 450,000,000.0 |
Percentage of par credit facilities were issued at |  |  |  |  |  | 99.00% |
Required quarterly principal payment (as a percent) |  |  | 0.25% |  |  |  |
Loss on early extinguishment of debt |  |  |  | $ 400,000 |  |  |
Secured Debt | 2016 Senior Term Loan | LIBOR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) | 2.75% | 3.00% | 2.75% |  |  |  |
Secured Debt | 2016 Senior Term Loan | LIBOR | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  | 0.75% |  |  |  |  |
Secured Debt | 2016 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 | 2015 Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 250,000,000.0
Secured Debt | 2015 $325 million Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 325,000,000 |  |  |  |
Maximum borrowing capacity |  | $ 325,000,000 | $ 325,000,000 |  |  |  |
Debt instrument term (in years) |  |  | 1 year |  |  |  |
Current borrowing capacity |  |  | $ 325,000,000 |  |  |  |
Secured Debt | 2015 $325 million Revolving Credit Facility | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage |  |  | 0.30% |  |  |  |
Secured Debt | 2015 $325 million Revolving Credit Facility | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage |  |  | 0.50% |  |  |  |
Secured Debt | 2015 $325 million Revolving Credit Facility | LIBOR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 2.50% |  |  |  |
Secured Debt | 2015 $325 million Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.00% |  |  |  |

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