Discontinued Operations Discontinued Operations - Assets Held-for-Sale (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	$ 19,734	$ 18,941
Other assets held for sale, net	1,960	793
350 Spectrum Loop building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	19,734	18,941
Straight-line rent	1,018	793
Deferred lease costs, less accumulated amortization of $78 and $0 as of September 30, 2013 and December 31, 2012, respectively	942	0
Accumulated amortization on deferred lease costs	78	0
Other assets held for sale, net	1,960	793
Land [Member] \| 350 Spectrum Loop building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	2,185	2,186
Building and improvements [Member] \| 350 Spectrum Loop building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	16,332	16,755
Accumulated depreciation (building improvements)	6,737	6,313
Construction in progress [Member] \| 350 Spectrum Loop building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	$ 1,217	$ 0

Disposal Group, Including Discontinued Operation, Accumulated Depreciation, Property Plant and Equipment

No definition available.

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- Definition

Disposal Group, Including Discontinued Operation, Deferred Lease Costs, Accumulated Amortization

+ References

No definition available.

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- Definition

Disposal Group, Including Discontinued Operation, Deferred Lease Costs, Net

+ References

No definition available.

+ Details

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- Definition

Disposal Group, Including Discontinued Operation, Straight-line Rent

+ References

No definition available.

+ Details

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- Definition

Net carrying amount as of the balance sheet date of investments in land, buildings, finite-lived intangibles, and construction in progress classified as held for sale.

+ References

No definition available.

+ Details

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- Definition

For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of assets not otherwise specified.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 47

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References

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