Accounting for the Impairment or Disposal of Long-Lived Assets - Asset Impairments in Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Asset Impairment Charges	$ 18,244	$ 117	$ 1,120
Tangible Asset Impairment Charges [Abstract]
Impairment - real estate assets	18,244	117	248
Impairments in discontinued operations			900
Richmond Hampton Roads [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	13,755	0	$ 0
Southeastern PA [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	2,328	106
Tampa [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	0	0	$ 248
United Kingdom [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	0	0	0
Other Segments [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges	$ 2,161	$ 11	$ 872

Asset impairments that were included in discontinued operations

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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=51824106&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=56944662&loc=d3e3602-108585

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- References

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