Lease Intangibles - Scheduled Amortization of Acquired Lease Intangible Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Acquired Lease Intangibles [Abstract]
Net Increase In Lease Revenues, Total	$ 78,866	$ 82,406
Amortizable Intangible Assets, Net Carrying Amount	(109,488)	(116,820)
In-place lease intangible assets
Acquired Lease Intangibles [Abstract]
2020, Net Increase In Lease Revenues	1,790
2021, Net Increase In Lease Revenues	7,043
2022, Net Increase In Lease Revenues	6,372
2023, Net Increase In Lease Revenues	5,894
2024, Net Increase In Lease Revenues	5,539
Thereafter, Net Increase In Lease Revenues	47,596
Net Increase In Lease Revenues, Total	74,234
2020, Increase to Amortization	(7,490)
2021, Increase to Amortization	(24,992)
2022, Increase to Amortization	(18,314)
2023, Increase to Amortization	(13,560)
2024, Increase to Amortization	(9,525)
Thereafter, Increase to Amortization	(30,975)
Amortizable Intangible Assets, Net Carrying Amount	(104,856)	$ (112,853)
2020, Reduction of Rent Expense	15
2021, Reduction of Rent Expense	58
2022, Reduction of Rent Expense	58
2023, Reduction of Rent Expense	58
2024, Reduction of Rent Expense	58
Thereafter, Reduction of Rent Expense	230
Reduction of Rent Expense, Total	477
2020, Net Income (Expense)	(5,685)
2021, Net Income (Expense)	(17,891)
2022, Net Income (Expense)	(11,884)
2023, Net Income (Expense)	(7,608)
Finite Lived Intangible Assets And Liabilities Amortization Revenue Expense Year Five	(3,928)
Thereafter, Net Income (Expense)	16,851
Total, Net Income (Expense)	$ (30,145)