Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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

Real Estate (Impairments) (Details) $ in Thousands	3 Months Ended		6 Months Ended
Real Estate (Impairments) (Details) $ in Thousands	Jun. 30, 2018 USD ($) Condominium_Unit	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Condominium_Unit	Jun. 30, 2017 USD ($)
Investment [Line Items]
Impairment of assets	$ 6,088	$ 10,284	$ 10,188	$ 14,696
Number of units to be sold per contract \| Condominium_Unit	4		4
Held-for-Sale, Impending Contract to Sell Condominiums
Investment [Line Items]
Impairment of assets			$ 8,900
Held-for-Sale, Change in Business Strategy
Investment [Line Items]
Impairment of assets				$ 4,400