Acquired In-Place Leases Acqured Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Total	$ 83,134	$ 83,732
Finite-Lived Intangible Assets, Accumulated Amortization	(36,195)	(36,376)
Finite-Lived Intangible Liabilities, Total	(186,596)	(198,463)
Finite-Lived Intangible Liabilities, Accumulated Amortization	68,009	66,473
Amortization of below market leases, lessor	9,623	12,445	$ 10,726
Net increase in rental income	6,384	6,837	4,721
Amortization of Below Market Lease, Lessee	828	828	781
Net increase in rental expense	303	323	491
Acquired Lease Liabilities
2020	8,235
2021	7,687
2022	7,394
2023	7,134
2024	6,603
Thereafter	81,534
Total future amortization expense from acquired below market leases	118,587
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of above market leases, lessor	(3,239)	(5,608)	(6,005)
Amortization of above market leases, lessee	$ (525)	(505)	$ (290)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years 8 months 12 days
Acquired Finite-Lived Intangible Liabilities, Weighted Average Useful Life	18 years 1 month 6 days
Acquired Lease Assets
2020	$ 4,350
2021	3,370
2022	2,716
2023	2,488
2024	2,223
Thereafter	31,792
Acquired Lease Liabilities
Finite-Lived Intangible Assets, Net	46,939
Above Market Leases, Lessor
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Total	48,530	49,128
Finite-Lived Intangible Assets, Accumulated Amortization	(32,833)	(33,843)
Below Market Leases, Lessee
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Total	34,604	34,604
Finite-Lived Intangible Assets, Accumulated Amortization	$ (3,362)	(2,533)
Below Market Lease
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	39 years 7 months 6 days
Acquired Finite-Lived Intangible Liabilities, Weighted Average Useful Life	14 years 4 months 24 days
Below Market Leases, Lessor
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Liabilities, Total	$ (177,512)	(189,379)
Finite-Lived Intangible Liabilities, Accumulated Amortization	66,419	65,408
Above Market Leases, Lessee
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Liabilities, Total	(9,084)	(9,084)
Finite-Lived Intangible Liabilities, Accumulated Amortization	$ 1,590	$ 1,065