Lease Intangibles - Scheduled Amortization of Acquired Lease Intangible Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Acquired Lease Intangibles [Abstract]
Net Increase In Lease Revenues, Total	$ 75,972	$ 82,406
Amortizable Intangible Assets, Net Carrying Amount	(100,732)	(116,820)
In-place lease intangible assets
Acquired Lease Intangibles [Abstract]
2021, Net Increase In Lease Revenues	6,920
2022, Net Increase In Lease Revenues	6,251
2023, Net Increase In Lease Revenues	5,784
2024, Net Increase In Lease Revenues	5,433
2025, Net Increase In Lease Revenues	4,767
Thereafter, Net Increase In Lease Revenues	42,564
Net Increase In Lease Revenues, Total	71,719
2021, Increase to Amortization	(24,599)
2022, Increase to Amortization	(18,089)
2023, Increase to Amortization	(13,428)
2024, Increase to Amortization	(9,486)
2025, Increase to Amortization	(8,376)
Thereafter, Increase to Amortization	(22,501)
Amortizable Intangible Assets, Net Carrying Amount	(96,479)	$ (112,853)
2021, Reduction of Rent Expense	58
2022, Reduction of Rent Expense	58
2023, Reduction of Rent Expense	58
2024, Reduction of Rent Expense	58
2025, Reduction of Rent Expense	58
Thereafter, Reduction of Rent Expense	172
Reduction of Rent Expense, Total	462
2021, Net Income (Expense)	(17,621)
2022, Net Income (Expense)	(11,780)
2023, Net Income (Expense)	(7,586)
2024, Net Income (Expense)	(3,995)
2025, Net Income (Expense)	(3,551)
Thereafter, Net Income (Expense)	20,235
Total, Net Income (Expense)	$ (24,298)