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Debt Obligations, Related Party Financing (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt Obligations |  |  |  |  |
Outstanding principal balance of related party financing | $ 50,000,000 |  | $ 50,000,000 |  | $ 50,000,000
Preferred equity interest financing agreement | ACM / Our "Former Manager" |  |  |  |  |
Debt Obligations |  |  |  |  |
Principal amount | $ 50,000,000 |  | $ 50,000,000 |  |
Maturity period (in years) |  |  | 5 years |  |
Interest rate (as a percent) | 7.00% |  | 7.00% |  |
Increasing of interest rate per annum thereafter (as a percent) |  |  | 1.00% |  |
Period after which principal balance scheduled to increase |  |  | 18 months |  |
Principal balance due if debt remained outstanding after the end of the five-year term | $ 62,500,000 |  | $ 62,500,000 |  |
Outstanding principal balance of related party financing | 50,000,000 |  | 50,000,000 |  | $ 50,000,000
Interest expense | $ 1,000,000 | $ 800,000 | $ 2,900,000 | $ 800,000 |
Preferred equity interest financing agreement | ACM / Our "Former Manager" | Maximum |  |  |  |  |
Debt Obligations |  |  |  |  |
Interest rate (as a percent) | 12.00% |  | 12.00% |  |

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