Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
Jun. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|---|---|
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Cash and cash equivalents | $ 9,289 | $ 8,798 | $ 11,246 | |
| Total cash, cash equivalents and restricted cash | 27,658 | 114,707 | 63,523 | $ 36,900 |
| Collateral deposits | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | 372 | 1,751 | 1,587 | |
| Tenant improvements, repairs, and leasing commissions | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | 9,147 | 8,257 | 10,392 | |
| Master Trust Release | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | 7,412 | 85,703 | 34,045 | |
| Liquidity reserve | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | 0 | 5,503 | 0 | |
| Other | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | $ 1,438 | $ 4,695 | $ 6,253 |