Real Estate Properties - Rental Revenue (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
Real Estate [Abstract] | ||||
Lease payments | $ 20,429 | $ 30,628 | $ 48,334 | $ 70,164 |
Variable lease payments | 10,145 | 14,941 | 21,130 | 30,678 |
Rental revenue | $ 30,574 | $ 45,569 | $ 69,464 | $ 100,842 |