Lease Intangibles - Scheduled Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Acquired Lease Intangibles [Abstract]
Amortizable Intangible Assets, Net Carrying Amount	$ (123,593)	$ (114,584)
In-place lease intangible assets
Acquired Lease Intangibles [Abstract]
2017 (Remainder), Net Increase In Lease Revenues	3,046
2018, Net Increase In Lease Revenues	9,874
2019, Net Increase In Lease Revenues	9,512
2020, Net Increase In Lease Revenues	7,860
2021, Net Increase In Lease Revenues	7,457
Thereafter, Net Increase In Lease Revenues	60,195
Net Increase In Lease Revenues, Total	97,944
2017 (Remainder), Increase to Amortization	(7,596)
2018, Increase to Amortization	(26,009)
2019, Increase to Amortization	(18,849)
2020, Increase to Amortization	(14,011)
2021, Increase to Amortization	(11,286)
Thereafter, Increase to Amortization	(39,775)
Amortizable Intangible Assets, Net Carrying Amount	(117,526)	$ (108,593)
2017 (Remainder), Reduction of Rent Expense	15
2018, Reduction of Rent Expense	58
2019, Reduction of Rent Expense	58
2020, Reduction of Rent Expense	58
2021, Reduction of Rent Expense	58
Thereafter, Reduction of Rent Expense	405
Reduction of Rent Expense, Total	652
2017 (Remainder), Net Income (Expense)	(4,535)
2018, Net Income (Expense)	(16,077)
2019, Net Income (Expense)	(9,279)
2020, Net Income (Expense)	(6,093)
2021, Net Income (Expense)	(3,771)
Thereafter, Net Income (Expense)	20,825
Total, Net Income (Expense)	$ (18,930)