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Real Estate (Held For Sale) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) property | Dec. 31, 2014 property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of properties classified as held for sale | property | 16 | 21 |
Land and improvements | $ 14,114 | $ 23,024 |
Building and improvements | 15,446 | 43,327 |
Real estate held for sale, gross | 29,560 | 66,351 |
Less impairment | (2,748) | (2,003) |
Real estate held for sale, net | $ 23,850 | $ 57,527 |
Discontinued operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of sold properties | property | 0 | 0 | 2
Assets Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Less accumulated depreciation and amortization | $ (2,962) | $ (6,821) |
Assets Held-for-sale | Discontinued operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of sold properties | property | 5 |  |

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- Definition Carrying amount as of the balance sheet date of parcels of land held for sale, and on which the entity has no intention or no further intention to perform construction activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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