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Impairment - Real Estate Investments (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Real Estate Investments Including Identifiable Intangible Assets Impairment [Line Items] |  |  |
Impairment charge | $ 450,000 | $ 0 | $ 13,500,000
Segment, Continuing Operations [Member] |  |  |
Real Estate Investments Including Identifiable Intangible Assets Impairment [Line Items] |  |  |
Impairment charge | 0 | 0 | 600,000
Segment, Discontinued Operations [Member] |  |  |
Real Estate Investments Including Identifiable Intangible Assets Impairment [Line Items] |  |  |
Impairment charge | $ 450,000 | $ 0 | $ 12,900,000

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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=8077374&loc=d3e2420-110228 + Details
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