Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross	$ 46,835		$ 42,914
Additions	0	$ 3,921
Accumulated amortization	(36,855)	(35,266)
Net definite lived intangible assets	9,980	11,569
Identifiable intangible assets – net	25,056	26,645
Customer relationships
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross		33,788	33,788
Additions	0	0
Accumulated amortization	(30,169)	(29,328)
Net definite lived intangible assets	$ 3,619	$ 4,460
Remaining useful life	9 years 1 month 6 days	10 years
Above-market leases
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross		$ 143	0
Additions	$ 0	143
Accumulated amortization	(38)	(16)
Net definite lived intangible assets	$ 105	$ 127
Remaining useful life	4 years 9 months 18 days	5 years 9 months 18 days
In-place lease
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross		$ 3,778	0
Additions	$ 0	3,778
Accumulated amortization	(1,004)	(430)
Net definite lived intangible assets	$ 2,774	$ 3,348
Remaining useful life	4 years 9 months 18 days	5 years 9 months 18 days
Below-market leases
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross		$ 9,126	$ 9,126
Additions	$ 0	0
Accumulated amortization	(5,644)	(5,492)
Net definite lived intangible assets	$ 3,482	$ 3,634
Remaining useful life	33 years 2 months 12 days	33 years 9 months 18 days
Trade Name
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Indefinite lived intangible asset (Trade name)	$ 15,076	$ 15,076