Intangibles - Future Aggregate Net Amortization of Acquired Lease Intangibles (Details 4) $ in Thousands	Sep. 30, 2017 USD ($)
Future aggregate net amortization of acquired lease intangibles (net decrease in revenue)
2017	$ (762)
2018	(2,849)
2019	(2,960)
2020	(3,087)
2021	(3,206)
Thereafter	(19,226)
Total	(32,090)
Future aggregate net amortization of acquired lease intangibles (net increase in expenses)
2017	9,336
2018	34,468
2019	30,335
2020	27,858
2021	26,380
Thereafter	139,206
Total	$ 267,583