Investments - Schedule of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 79,177	$ 78,922
Intangible assets, Accumulated Amortization	20,603	18,423
Intangible assets, Net Carrying Amount	58,574	60,499
Intangible market lease liabilities, Gross Carrying Amount	11,866	12,054
Intangible market lease liabilities, Accumulated Amortization	2,737	2,490
Intangible market lease liabilities, Net Carrying Amount	9,129	9,564
In-place leases
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	66,533	64,828
Intangible assets, Accumulated Amortization	16,659	14,195
Intangible assets, Net Carrying Amount	49,874	50,633
Intangible market lease assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	12,644	14,094
Intangible assets, Accumulated Amortization	3,944	4,228
Intangible assets, Net Carrying Amount	$ 8,700	$ 9,866