Acquired In-Place Leases Acqured Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 83,732	$ 86,997
Finite-Lived Intangible Assets, Accumulated Amortization	(36,376)	(33,111)
Finite-Lived Intangible LIabilities, Net	(198,463)	(202,169)
Finite-Lived Intangible Liabilities, Accumulated Amortization	66,473	57,276
Amortization of below market leases, lessor	12,445	10,726	$ 8,551
Net increase in rental income	6,837	4,721	1,825
Amortization of Below Market Lease, Lessee	828	781	255
Net increase in rental expense	323	491	120
Acquired Lease Liabilities
2019	9,284
2020	8,290
2021	7,677
2022	7,296
2023	7,030
Thereafter	92,413
Total future amortization expense from acquired below market leases	131,990
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	47,356
Amortization of above market leases, lessor	(5,608)	(6,005)	(6,726)
Amortization of above market leases, lessee	$ (505)	(290)	$ (135)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
Acquired Finite-Lived Intangible Liabilities, Weighted Average Useful Life	19 years
Acquired Lease Assets
2019	$ 3,720
2020	3,086
2021	2,730
2022	2,320
2023	2,191
Thereafter	33,309
Above Market Leases, Lessor
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	49,128	52,393
Finite-Lived Intangible Assets, Accumulated Amortization	(33,843)	(31,406)
Below Market Leases, Lessee
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	34,604	34,604
Finite-Lived Intangible Assets, Accumulated Amortization	$ (2,533)	(1,705)
Below Market Lease
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	40 years 7 months
Acquired Finite-Lived Intangible Liabilities, Weighted Average Useful Life	15 years 11 months
Below Market Leases, Lessor
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Liabilities, Gross	$ (189,379)	(193,085)
Finite-Lived Intangible Liabilities, Accumulated Amortization	65,408	56,716
Above Market Leases, Lessee
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Liabilities, Gross	(9,084)	(9,084)
Finite-Lived Intangible Liabilities, Accumulated Amortization	$ 1,065	$ 560