Land, Buildings and Improvements and Assets Held for Sale - Summary of Assets Held for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Real Estate Properties
Assets held for sale, net	$ 102,777	$ 0
Land, buildings and improvements
Real Estate Properties
Assets held for sale, net	105,590	0
Accumulated depreciation and amortization
Real Estate Properties
Assets held for sale, net	$ 2,813	$ 0

Amount of assets held-for-sale that are not part of a disposal group.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220

Name:	us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant