Real Estate Investments (Details) - Purchase Price Allocation of Properties Acquired - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Document Period End Date	Dec. 31, 2018
Assets
Land	$ 7,666	$ 123,203
Building and improvements	35,629	251,277
Acquired lease intangible asset	1,763	24,766
Deferred charges	818	9,196
Assets acquired	45,876	408,442
Liabilities
Mortgage notes assumed	0	46,801
Acquired lease intangible liability	1,680	48,684
Liabilities assumed	$ 1,680	$ 95,485