Impairment - Real Estate Investments (Details) (USD $)	12 Months Ended
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

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 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

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