Lease Intangibles - Scheduled Amortization of Acquired Lease Intangible Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Acquired Lease Intangibles [Abstract]
Net Increase In Lease Revenues, Total	$ 88,839	$ 94,467
Amortizable Intangible Assets, Net Carrying Amount	(117,074)	(115,939)
In-place lease intangible assets
Acquired Lease Intangibles [Abstract]
2019 (Remainder), Net Increase In Lease Revenues	2,805
2020, Net Increase In Lease Revenues	8,011
2021, Net Increase In Lease Revenues	7,512
2022, Net Increase In Lease Revenues	7,141
2023, Net Increase In Lease Revenues	7,134
Thereafter, Net Increase In Lease Revenues	51,574
Net Increase In Lease Revenues, Total	84,177
2019 (Remainder), Increase to Amortization	(15,140)
2020, Increase to Amortization	(24,067)
2021, Increase to Amortization	(17,514)
2022, Increase to Amortization	(12,551)
2023, Increase to Amortization	(9,919)
Thereafter, Increase to Amortization	(33,221)
Amortizable Intangible Assets, Net Carrying Amount	(112,412)	$ (110,049)
2019 (Remainder), Reduction of Rent Expense	29
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	288
Reduction of Rent Expense, Total	549
2019 (Remainder), Net Income (Expense)	(12,306)
2020, Net Income (Expense)	(15,998)
2021, Net Income (Expense)	(9,944)
2022, Net Income (Expense)	(5,352)
2023, Net Income (Expense)	(2,727)
Thereafter, Net Income (Expense)	18,641
Total, Net Income (Expense)	$ (27,686)