Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Gross Carrying Value
Total	$ 99,566	$ 93,860
Accumulated Amortization
Intangible assets, accumulated amortization	11,791	10,594
Net Carrying Value
Total	87,775	83,266
Tenant relationship
Gross Carrying Value
Intangible assets not subject to amortization	73,667	73,667
Accumulated Amortization
Intangible assets, accumulated amortization	0
Net Carrying Value
Intangible assets not subject to amortization	73,667	73,667
Trade names
Gross Carrying Value
Intangible assets not subject to amortization	3,264	1,290
Accumulated Amortization
Intangible assets, accumulated amortization	0
Net Carrying Value
Intangible assets not subject to amortization	3,264	1,290
Database
Gross Carrying Value
Intangible assets subject to amortization	4,918	4,918
Accumulated Amortization
Intangible assets, accumulated amortization	3,259	3,013
Net Carrying Value
Intangible assets subject to amortization	1,659	1,905
Vehicle service agreements in-force
Gross Carrying Value
Intangible assets subject to amortization	3,680	3,680
Accumulated Amortization
Intangible assets, accumulated amortization	3,675	3,671
Net Carrying Value
Intangible assets subject to amortization	5	9
Customer relationships
Gross Carrying Value
Intangible assets subject to amortization	12,646	8,914
Accumulated Amortization
Intangible assets, accumulated amortization	4,580	3,691
Net Carrying Value
Intangible assets subject to amortization	8,066	5,223
In-place lease
Gross Carrying Value
Intangible assets subject to amortization	1,125	1,125
Accumulated Amortization
Intangible assets, accumulated amortization	186	155
Net Carrying Value
Intangible assets subject to amortization	939	970
Non-compete
Gross Carrying Value
Intangible assets subject to amortization	266	266
Accumulated Amortization
Intangible assets, accumulated amortization	91	64
Net Carrying Value
Intangible assets subject to amortization	$ 175	$ 202