Other Significant Events (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) tenant	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) tenant	Sep. 30, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for bad debts	$ 1,338	$ 1,036	$ 6,714	$ 2,743
Tenant One [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provisions for bad debts, increase (decrease)	$ 7,000
Number of tenants \| tenant	1		1

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.5)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044

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