Lease Intangibles - Scheduled Amortization of Acquired Lease Intangible Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Acquired Lease Intangibles [Abstract]
Net Increase In Lease Revenues, Total	$ 77,595	$ 75,972
Amortizable Intangible Assets, Net Carrying Amount	(95,518)	(100,732)
In-place lease intangible assets
Acquired Lease Intangibles [Abstract]
2021 (Remainder), Net Increase In Lease Revenues	1,557
2022, Net Increase In Lease Revenues	5,849
2023, Net Increase In Lease Revenues	5,404
2024, Net Increase In Lease Revenues	5,280
2025, Net Increase In Lease Revenues	4,807
Thereafter, Net Increase In Lease Revenues	49,496
Net Increase In Lease Revenues, Total	72,393
2021 (Remainder), Increase to Amortization	(6,494)
2022, Increase to Amortization	(21,736)
2023, Increase to Amortization	(16,515)
2024, Increase to Amortization	(11,313)
2025, Increase to Amortization	(8,021)
Thereafter, Increase to Amortization	(26,237)
Amortizable Intangible Assets, Net Carrying Amount	(90,316)	$ (96,479)
2021 (Remainder), Reduction of Rent Expense	15
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	170
Reduction of Rent Expense, Total	417
2021 (Remainder), Net Income (Expense)	(4,922)
2022, Net Income (Expense)	(15,829)
2023, Net Income (Expense)	(11,053)
2024, Net Income (Expense)	(5,975)
2025, Net Income (Expense)	(3,156)
Thereafter, Net Income (Expense)	23,429
Total, Net Income (Expense)	$ (17,506)