Real Estate Assets (Details) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($) a parcels
Acquisitions [Abstract]
Undeveloped land suitable for future development (in acres)	400
Nashville TN Land Acquisition [Member]
Acquisitions [Abstract]
Number of development parcels acquired (in parcels) \| parcels	2
Undeveloped land suitable for future development (in acres)	9
Purchase price of acquisition \| $	$ 50.6

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration