Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|---|---|
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Cash and cash equivalents | $ 10,989 | $ 8,798 | $ 9,309 | |
| Total cash, cash equivalents and restricted cash | 128,154 | 114,707 | 52,683 | $ 36,898 |
| Collateral deposits | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | 1,190 | 1,751 | 1,451 | |
| Tenant improvements, repairs, and leasing commissions | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | 8,782 | 8,257 | 10,277 | |
| Master Trust Release | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | 97,010 | 85,703 | 30,395 | |
| Liquidity reserve | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | 5,527 | 5,503 | 0 | |
| Other | ||||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||||
| Restricted cash | $ 4,656 | $ 4,695 | $ 1,251 |