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Real Estate (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Real Estate Tenant Receivables
Schedule of Operating Lease Allowance for Doubtful Accounts [Line Items]
Allowance for doubtful accounts receivable	$ 1.6	$ 1.3
Deferred Operating Lease
Schedule of Operating Lease Allowance for Doubtful Accounts [Line Items]
Allowance for doubtful accounts receivable	$ 1.5	$ 1.3

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- Definition

[Line Items] for Schedule of Operating Lease Allowance for Doubtful Accounts [Table]

+ References

No definition available.

+ Details

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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