Intangibles - Future Aggregate Net Amortization of Acquired Lease Intangibles (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Net Decrease in Revenue
2019	$ (1,990)
2012	(2,718)
2021	(2,648)
2022	(2,203)
2023	(1,899)
Thereafter	(12,494)
Total	(23,952)
Net Increase in Expenses
2019	26,699
2020	33,486
2021	31,233
2022	27,451
2023	24,743
Thereafter	141,888
Total	$ 285,500