Leases - Tenant Purchase Options (Details) $ in Thousands	Dec. 31, 2018 USD ($) property
Leases, Capital [Abstract]
2019 | $	$ 23,771
2020 | $	14,545
2021 | $	12,747
2022 | $	13,315
Thereafter | $	50,577
Total | $	$ 114,955
Number of Properties
2019 | property	10
2020 | property	4
2021 | property	6
2022 | property	3
Thereafter | property	34
Total number of properties (in properties) | property	57