Lease Intangibles - Scheduled Amortization of Acquired Lease Intangible Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Acquired Lease Intangibles [Abstract]
Net Increase In Lease Revenues, Total	$ 89,298	$ 94,467
Amortizable Intangible Assets, Net Carrying Amount	(121,171)	(115,939)
In-place lease intangible assets
Acquired Lease Intangibles [Abstract]
2019 (Remainder), Net Increase In Lease Revenues	2,233
2020, Net Increase In Lease Revenues	8,120
2021, Net Increase In Lease Revenues	7,672
2022, Net Increase In Lease Revenues	7,312
2023, Net Increase In Lease Revenues	7,386
Thereafter, Net Increase In Lease Revenues	52,388
Net Increase In Lease Revenues, Total	85,111
2019 (Remainder), Increase to Amortization	(8,454)
2020, Increase to Amortization	(27,446)
2021, Increase to Amortization	(20,486)
2022, Increase to Amortization	(14,970)
2023, Increase to Amortization	(11,432)
Thereafter, Increase to Amortization	(34,196)
Amortizable Intangible Assets, Net Carrying Amount	(116,984)	$ (110,049)
2019 (Remainder), Reduction of Rent Expense	15
2020, Reduction of Rent Expense	58
2021, Reduction of Rent Expense	58
2022, Reduction of Rent Expense	58
2023, Reduction of Rent Expense	58
Thereafter, Reduction of Rent Expense	287
Reduction of Rent Expense, Total	534
2019 (Remainder), Net Income (Expense)	(6,206)
2020, Net Income (Expense)	(19,268)
2021, Net Income (Expense)	(12,756)
2022, Net Income (Expense)	(7,600)
2023, Net Income (Expense)	(3,988)
Thereafter, Net Income (Expense)	18,479
Total, Net Income (Expense)	$ (31,339)