Summary of Significant Accounting Policies - Business Overview/Segment Reporting (Details) $ in Thousands, ft² in Millions |
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Sep. 30, 2018
USD ($)
|
Sep. 30, 2018
USD ($)
|
Sep. 30, 2019
USD ($)
ft²
state
real_estate_property
|
Jan. 01, 2019
USD ($)
lease
|
Dec. 31, 2018
USD ($)
|
|
Disaggregation of Revenue [Line Items] | |||||
Value of real estate property investments and mortgages | $ 566,300 | ||||
Number of real estate properties | real_estate_property | 111 | ||||
Number of states in which real estate investments are in | state | 32 | ||||
Area of real estate property (in square feet) | ft² | 2.5 | ||||
Operating lease ROU assets | $ 140 | $ 0 | |||
Tenant reimbursements | |||||
Disaggregation of Revenue [Line Items] | |||||
Other operating interest | $ 1,700 | $ 4,700 | |||
ASU 2016-02 | |||||
Disaggregation of Revenue [Line Items] | |||||
Operating lease ROU assets | $ 100 | ||||
Operating lease liabilities | $ 100 | ||||
Number of ground leases | lease | 1 |