Discontinued Operations - Assets Held-for-Sale (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	$ 13,939	$ 13,995
Other assets held for sale, net	3,191	3,319
1441 West Long Lake Road and 4685 Investment Drive building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	13,939	13,995
Straight-line rent receivables	1,131	1,113
Deferred lease costs, less accumulated amortization of $501 and $583 as of March 31, 2014 and December 31, 2013, respectively	2,060	2,206
Accumulated amortization on deferred lease costs	501	583
Other assets held for sale, net	3,191	3,319
Intangible lease assets [Member] \| 1441 West Long Lake Road and 4685 Investment Drive building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net, Intangible lease assets	887	1,018
Accumulated amortization on intangible lease assets	363	232
Land [Member] \| 1441 West Long Lake Road and 4685 Investment Drive building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	2,402	2,402
Building and improvements [Member] \| 1441 West Long Lake Road and 4685 Investment Drive building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	10,650	10,575
Accumulated depreciation (building improvements)	$ 6,227	$ 7,403

Disposal Group, Including Discontinued Operation, Accumulated Amortization, Intangible Lease Assets

No definition available.

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- Definition

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

+ References

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 value (net of any accumulated amortization and write-downs) of nonphysical assets (such as copyrights, customer lists, patents, trade names, core deposits, trade secrets, and contractual rights), not elsewhere itemized.

+ 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

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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

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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.

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