Commitments and Contingencies - Narrative (Details) |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2019
USD ($)
renewal_option
ground_lease
tenant
claim
|
Dec. 31, 2018
USD ($)
|
|
| Commitments and Contingencies Disclosure [Abstract] | ||
| Contingently liable amount of debt owed by tenant | $ 5,700,000 | $ 5,700,000 |
| Number of tenants indemnified by | tenant | 1 | |
| Accruals made for environmental remediation | $ 0 | |
| Outstanding claims | claim | 0 | |
| Total commitments | $ 49,100,000 | |
| Total commitments relating to future acquisitions | 14,600,000 | |
| Commitments to purchase capital assets within one year expected to be funded within one year | $ 39,800,000 | |
| Operating lease number of renewal options | renewal_option | 2 | |
| Operating lease renewal term | 5 years | |
| Number of long-term non-cancelable ground leases | ground_lease | 4 | |
| Operating lease, weighted average remaining lease term | 8 years 3 months | |
| Operating lease, weighted average discount rate | 4.30% | |
| Incentive to lessee | $ 1,700,000 | |
| Operating lease, right-of-use assets | $ 6,100,000 |