Intangibles - Amortization of Acquired Lease Intangibles (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Future aggregate net amortization of acquired lease intangibles (Net decrease in Revenue)
2019	$ (2,592)
2020	(2,695)
2021	(2,648)
2022	(2,203)
2023	(1,899)
Thereafter	(12,494)
Total	(24,531)
Future aggregate net amortization of acquired lease intangibles (Net Increase in Expenses)
2019	35,405
2020	32,721
2021	30,475
2022	26,686
2023	23,998
Thereafter	137,426
Total	$ 286,711