Real Estate and Operating Real Estate - Hurricane Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Real Estate Properties
Insurance deductible			$ (1,800)
Hotel
Real Estate Properties
Beginning balance	$ 30,756	$ 0
Estimated receivable proceeds	(2,229)	32,583
Property damage insurance advances received	(191)	0
Insurance deductible	0	(1,827)
Property damage insurance receivables	$ 28,336	$ 30,756

Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21B
-URI http://asc.fasb.org/extlink&oid=98514028&loc=SL94080549-108585

Name:	us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration