Intangibles - Future Aggregate Net Amortization of Acquired Lease Intangibles (Details 4) $ in Thousands	Mar. 31, 2017 USD ($)
Future aggregate net amortization of acquired lease intangibles (net decrease in revenue)
2017	$ (2,315)
2018	(2,986)
2019	(3,113)
2020	(3,203)
2021	(3,281)
Thereafter	(19,505)
Total	(34,403)
Future aggregate net amortization of acquired lease intangibles (net increase in expenses)
2017	24,138
2018	28,461
2019	24,096
2020	21,719
2021	20,320
Thereafter	108,776
Total	$ 227,510