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Real Estate (Impairments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Investment [Line Items] |  |  |  |
Impairment of assets | $ 989 | $ 595 | $ 11,177 | $ 15,292
Held-for-Sale, Impending Contract to Sell Condominiums |  |  |  |
Investment [Line Items] |  |  |  |
Impairment of assets |  |  | $ 9,900 |
Held-for-Sale, Change in Business Strategy |  |  |  |
Investment [Line Items] |  |  |  |
Impairment of assets |  |  |  | 4,400
Commercial Operating Properties |  |  |  |
Investment [Line Items] |  |  |  |
Impairment of assets |  |  |  | $ 600

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- Definition 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. + References 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 + Details
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