Revenue Recognition Revenue Recognition (Details) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($)
Additional Information [Abstract]
Management Fees, Incentive Revenue	$ 0.3
Brokerage Commissions Revenue	$ 0.4

Revenue for operating and managing another entity's business during the reporting period which is based on meeting certain operating or revenue metrics (for example: occupancy or vacancy rates, profitability or expense targets), or otherwise meant to incentivize the operator other than by guaranteed or minimum compensation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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